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Magnesium alloys are lighter by volume, but they are not automatically the best lightweight material. ASM International lists magnesium-alloy density at 1.74 g/cm³ and aluminum density at 2.7 g/cm³, so an unchanged magnesium volume weighs about 36% less. A finished part may save more, less, or no weight after its geometry is redesigned for stiffness, strength, joints, corrosion protection and manufacturing.
Neither alloy family is universally stronger or more impact-resistant. Magnesium data in ASM’s 1998 selection reference span 160–365 MPa in tensile strength, while aluminum properties vary widely by alloy, temper and product form. The available sources do not provide a controlled, matched-grade impact comparison. Select a specific grade and temper against the same load cases, environment, manufacturing route and test method rather than choosing by family name.
At a glance: which alloy should you choose?
| Decision factor | Magnesium alloys | Aluminum alloys | What it means for a design |
|---|---|---|---|
| Reference density | 1.74 g/cm³ (ASM International, 1998) | 2.7 g/cm³ (ASM International subject guide; publication year not shown in the retrieved page) | For the same volume, magnesium is about 35.6% lighter. Finished-part mass depends on geometry and added features. |
| Typical family strength information | 160–365 MPa tensile-strength range reported by ASM in 1998; broad, not a design allowable | No single family value; grade and temper determine strength. ASM describes the family as combining strength and ductility. | Compare specified yield and tensile values for the exact alloy, temper and product form. |
| Elastic modulus | 45 GPa reported by ASM in 1998 | Not stated in the supplied sources as one family value | Lower stiffness can govern a magnesium design even when its strength-to-weight ratio is attractive. |
| Impact resistance | No universal family ranking established | No universal family ranking established | Use the same impact method, temperature, loading rate, specimen geometry and material condition for both candidates. |
| Vibration damping | ASM describes high damping capacity | Specific comparative value not stated | Magnesium can reduce elastic-vibration response in suitable structures, but fatigue and vibration tests remain necessary. |
| Corrosion and oxidation | Protection and corrosion behavior require specific attention | Generally good corrosion and oxidation resistance at the family level, with alloy and environment effects | Specify coatings, isolation, drainage and inspection for the actual environment. |
| Formability and ductility | Depends strongly on alloy and process | ASM highlights a good combination of strength and ductility; formability varies by grade and temper | Match the alloy to casting, forging, extrusion, sheet forming or machining requirements. |
| Family-level cost statement | No general cost conclusion supplied | ASM characterizes aluminum alloys as relatively low cost at the family level | Calculate delivered material, processing, finishing, scrap, tooling and lifecycle costs for the part. |
The table is for early screening only. ASM cautions that typical material data are not intended for final design or specification.
Why magnesium weighs less
Material density is not finished-part weight
Density is mass per unit volume. Using the reference values, a 1,000 cm³ block would weigh approximately 1.74 kg in magnesium alloy and 2.70 kg in aluminum alloy before machining or finishing. The magnesium block would therefore be about 0.96 kg lighter, or 35.6% lighter than the aluminum block. ASM’s 2012 magnesium chapter summarizes the same relationship by describing magnesium as about two-thirds the weight of aluminum by volume.
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This calculation is useful for isolating the material effect, not for promising a percentage saving on a real component. A housing, bracket or frame is designed around deflection, buckling, bearing stress, fastener loads, thermal conditions and manufacturing constraints. If magnesium’s lower modulus causes excessive deflection, the designer may need deeper ribs, thicker walls or shorter spans. Inserts, coatings, isolating washers and different joints also add mass. Conversely, a casting process may allow magnesium to place material efficiently and remove features that would be separate parts in another material.
Calculate mass for the actual geometry
- Obtain the part’s net material volume from the CAD model, excluding voids and tooling features.
- Multiply volume by the candidate alloy’s certified density at the design temperature. Keep units consistent; 1 cm³ multiplied by 1.74 g/cm³ gives 1.74 g.
- Add permanent inserts, fasteners, coatings, sealants and attached hardware.
- Include process allowances only when comparing manufacturing routes, not when reporting the final installed mass.
- Recheck the calculation after optimizing ribs, wall thickness, bosses and joint details for each alloy.
Use the same load cases and allowable deflections when comparing redesigned parts. Otherwise, a lighter result may simply reflect a less demanding design rather than a material advantage.
Strength: why there is no universal winner
What the magnesium figures actually say
ASM International’s 1998 selection reference reports a broad magnesium-alloy tensile-strength range of 160–365 MPa. That span covers different alloy chemistries, tempers, product forms and test conditions; it is not a guaranteed minimum and should not be substituted for a drawing value or design allowable. Tensile strength also describes failure in a uniaxial test. A part may instead be limited by yield, fatigue, bearing, tear-out, buckling, weld quality or a casting defect.
Aluminum strength is equally grade-dependent
“Aluminum” covers numerous wrought and cast families. Heat treatment and temper can change strength and ductility, and sheet, extrusion, forging and casting do not behave identically. ASM’s 2019 handbook abstracts use 6013 and 6061 as examples of aluminum alloys with distinct applications and behavior. A temper designation, product form and applicable specification must accompany any aluminum value used in a design review.
Do not compare the upper end of a magnesium family range with a generic aluminum value, or compare a cast magnesium alloy with a high-strength wrought aluminum temper, and call the result a material ranking. Ask for yield strength, ultimate tensile strength, elongation, fatigue data and statistical basis for the exact condition.
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Strength-to-weight is useful but incomplete
Dividing strength by density can reveal where magnesium’s low mass is valuable. It does not account for stiffness. ASM reports a magnesium elastic modulus of 45 GPa. A lower modulus means more elastic deflection under the same stress and geometry than a stiffer material. If a camera mount, precision frame or gear housing must hold alignment, stiffness may require additional section depth that erases part of the density advantage.
Use a strength-to-weight comparison only after setting the governing failure mode. For a tension member, specific yield strength may be informative. For a beam, section geometry and modulus often govern. For a thin panel, buckling, local denting and joint loads may dominate. For a rotating component, fatigue, balance and containment requirements can outweigh static tensile strength.
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No defensible family-level winner
The available technical sources do not provide a controlled, matched-grade impact comparison between magnesium and aluminum. It is therefore not accurate to state that one family is categorically safer in a crash, drop or stone-impact event. Impact behavior depends on alloy, temper, casting quality, grain structure, thickness, notch geometry, temperature, loading rate and constraint from neighboring parts.
Specify the test before comparing results
For a meaningful comparison, document all of the following:
- Impact method and standard, such as a Charpy, Izod, instrumented drop or component crash test.
- Specimen dimensions, notch geometry, surface condition and orientation relative to rolling or extrusion.
- Alloy designation, temper, product form and heat-treatment record.
- Impactor mass, velocity, energy, contact shape and loading rate.
- Test temperature and humidity, especially for cold-service equipment.
- Acceptance criteria: absorbed energy, maximum force, crack initiation, residual strength or allowable deformation.
When the component itself matters, test production-representative parts with the intended joints, coatings and defects. A coupon ranking may not predict a ribbed casting, bolted bracket or thin sheet assembly.
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Design for energy and failure containment
Impact-resistant design is more than selecting a tougher alloy. Rounded transitions reduce stress concentration; adequate edge distance limits tear-out; replaceable sacrificial members can protect a high-value enclosure; and controlled crush zones can absorb energy without sending a peak load into electronics. Check rebound, fragment retention and post-impact function when the part is safety-critical.
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ASM describes magnesium as having high damping capacity, meaning it can absorb a comparatively large portion of elastic vibration. This can help housings, optical supports, portable instruments and other vibration-sensitive structures. Damping can reduce resonance amplitude and settling time, but it does not guarantee lower noise or longer fatigue life.
Measure the assembled structure, not just a material coupon. Fasteners, interfaces, coatings, cable loads and mounted equipment determine natural frequencies and damping. Run modal, random-vibration and fatigue analyses or tests using the actual boundary conditions. A magnesium part that needs thicker ribs for stiffness may have different frequencies and mass distribution than an aluminum part, so damping alone cannot determine the winner.
Corrosion, compatibility and protection
Magnesium requires a deliberate protection strategy
ASM’s magnesium references emphasize corrosion behavior and protective treatments as important selection issues. Define the environment before choosing a grade: fresh or salt water, condensation, road salt, industrial chemicals, galvanic contact, temperature cycling and trapped moisture can all change risk. Surface treatment, paint, conversion coating, anodic protection, seal design and drainage may be required.
Electrical contact with a more noble metal can create a galvanic couple when an electrolyte is present. Isolation washers, compatible fasteners, sealed interfaces and controlled coating damage are practical design measures, but they must be validated for the actual stack-up and service life.
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Aluminum is not corrosion-proof
ASM characterizes aluminum alloys generally as offering good corrosion and oxidation resistance, ductility and formability. “Generally” does not mean every grade survives every environment. High-strength tempers, weld zones, crevices, dissimilar-metal joints and chloride exposure can require their own protection. Compare corrosion rate, pitting, stress-corrosion susceptibility and coating durability for the chosen alloy rather than relying on the family label.
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Casting, forming and product form
Choose the process together with the alloy. Die casting, sand casting, permanent-mold casting, extrusion, rolling, forging and machining impose different limits on wall thickness, porosity, grain direction, dimensional tolerance and heat treatment. A grade that is excellent in an extrusion may be unsuitable for a pressure-tight casting, while a cast alloy may not offer the elongation expected from a wrought product.
For magnesium, confirm melt handling, protective-atmosphere requirements where applicable, feeding and solidification controls, and the supplier’s inspection plan. For aluminum, verify temper after forming or welding because thermal cycles can reduce local strength. In either family, obtain process-specific allowables rather than copying handbook values from another product form.
Machining
Machining economics depend on chip volume, tool life, cycle time, coolant practice, fire controls, tolerances and scrap. Magnesium’s low density reduces handled mass but does not remove the need for disciplined chip management and process safety. Aluminum’s machinability varies by grade and temper; gummy alloys, built-up edge and burrs can affect cost and finish. Ask the machine shop for an approved process window and documented housekeeping controls.
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Joining
Compare welding, brazing, adhesive bonding, riveting and bolting as complete systems. Welding can alter heat-treated zones and distortion; bolted joints add inserts, washers and galvanic interfaces; adhesives require surface preparation, cure control and environmental qualification. Joint efficiency, fatigue detail category, leak tightness and repairability may dominate the material choice. Include inspection access and end-of-life disassembly in the evaluation.
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Cost and supply decisions
ASM characterizes aluminum alloys as relatively low cost at the family level, but that statement is not a quotation for a grade or finished component. Magnesium’s lower density can reduce material mass and handling, while coatings, specialized processing, lower production volume, tooling, machining and corrosion controls can increase total cost. The opposite can also occur when a magnesium casting consolidates several aluminum parts.
Build a delivered-cost model with separate lines for:
- Certified alloy, temper and minimum order quantity.
- Conversion process, tooling, heat treatment and nondestructive inspection.
- Machining, scrap, rework and dimensional inspection.
- Surface treatment, paint, sealing and galvanic-isolation hardware.
- Fasteners, inserts, joining consumables and assembly labor.
- Warranty, maintenance, replacement and recycling assumptions.
Confirm regional availability and lead time for the exact specification. A theoretically ideal alloy that cannot be sourced consistently is not a robust production choice.
A step-by-step selection method
- Write the requirements. Record mass target, static loads, fatigue cycles, allowable deflection, impact energy, temperature range, corrosion environment, service life and regulatory constraints.
- Define the product form. Decide whether the part will be cast, forged, rolled, extruded, machined or assembled from several forms. Eliminate grades that cannot be supplied in that form.
- Shortlist specific conditions. Put alloy designation, temper, heat treatment, thickness and orientation beside every candidate.
- Collect comparable properties. Obtain yield and tensile strength, elongation, modulus, fatigue data, fracture or impact results, density and corrosion data from the applicable specification or supplier certificate.
- Model stiffness and stability. Check deflection, natural frequency, buckling, bearing stress, local denting and joint compliance. Redesign each material fairly instead of copying one geometry.
- Plan impact validation. Select the test method, temperature, loading rate, acceptance criteria and production-representative specimen before declaring an impact winner.
- Design protection and joints. Specify coatings, isolation, drainage, fasteners, weld procedures, adhesive preparation and inspection points.
- Cost the whole lifecycle. Include tooling, scrap, finishing, assembly, maintenance, field repairs and end-of-life handling.
- Freeze only with verified data. Use handbook values for orientation; use applicable standards, certificates and component tests for final drawings and safety decisions.
Worked screening example
Suppose two first-pass concepts each occupy 2,000 cm³ of alloy before redesign. The magnesium concept would contain approximately 3.48 kg of alloy (2,000 × 1.74), while the aluminum concept would contain approximately 5.40 kg (2,000 × 2.70). The initial material-only difference is 1.92 kg.
That result is not the final part comparison. If the magnesium design needs thicker ribs, corrosion-resistant inserts and an isolation coating, its installed mass rises. If the aluminum design needs separate brackets or a heavier wall to meet a deflection limit, its mass rises instead. Recalculate both concepts after structural analysis, process definition and joint design, then validate the governing load and impact cases.
Mistakes that produce misleading comparisons
- Calling 1.74 and 2.7 g/cm³ a guaranteed percentage saving for every finished component.
- Using a broad 160–365 MPa magnesium range as though it were one grade’s allowable strength.
- Comparing unmatched tempers, castings and wrought products.
- Using tensile strength to answer a question governed by stiffness, fatigue, buckling or bearing.
- Declaring an impact winner without naming the test method and conditions.
- Ignoring coatings, galvanic isolation, inserts and fasteners in mass and cost.
- Transferring handbook typical values directly into a final drawing.
- Assuming aluminum’s general corrosion resistance eliminates environmental qualification.
- Choosing a material before confirming supply form, process capability and inspection requirements.
Technical references for deeper design work
ASM International’s Selection and Application of Magnesium and Magnesium Alloys (1998) provides the cited magnesium density, tensile-strength range and modulus, while its Magnesium Alloys chapter in Lightweight Materials: Understanding the Basics (2012) discusses density, damping, processing and corrosion. ASM’s Aluminum and Aluminum Alloys subject material covers aluminum’s family-level strength, ductility, formability, corrosion and cost context, and its 2019 handbook abstracts illustrate why 6013 and 6061 must be treated as distinct alloys. The ASM Specialty Handbook: Magnesium and Magnesium Alloys (1999) is a further reference on properties, processing and commercial uses.
Use these references to frame a shortlist, then replace typical values with the governing specification, supplier certification and tests for the actual component.
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