Magnesium Alloy AZ91E
ASTM AZ91E · UNS M11919
AZ91E is the high-purity sand and permanent-mold casting version of AZ91, with tightly controlled Fe, Ni and Cu (UNS M11919) and F, T4, T5 and T6 conditions.
Reference datasheet — AZ91E is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the T6 condition
AZ91E tempers and conditions
AZ91E is supplied in 4 conditions, soft to hard. T6 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution heat treated and naturally aged | Pick when maximum ductility, toughness and impact resistance matter more than yield strength. | 90 | 275 | 14 | 55 HB | 72 W/m·K |
As fabricated | Lowest-cost as-cast condition for non-critical housings and covers where ductility and strength are not driving. | 97 | 165 | 2.5 | 60 HB | 51 W/m·K |
Cooled from hot working and artificially aged | Low-distortion, low-cost aging of as-cast parts giving a modest hardness/yield gain without a solution soak. | 110 | 165 | 2 | 66 HB | 10 % IACS |
T6Default Solution heat treated and artificially aged | Standard structural condition: best combination of yield strength, hardness and fatigue for gearbox and housing castings. | 145 | 275 | 6 | 70 HB | 72 W/m·K |
What is AZ91E?
AZ91E is the high-purity sand and permanent-mold casting version of AZ91, with tightly controlled Fe, Ni and Cu (UNS M11919) and F, T4, T5 and T6 conditions. Engineers specify it for structural castings that need ductility as well as corrosion life: 145 MPa yield, 275 MPa tensile, 6% elongation and 70 HB, with 72 W/m·K conductivity and service to 150 °C. It welds readily with AZ92A or AZ101A filler (score 70) and machines faster than competing structural metals. Corrosion resistance still rates only 30 and needs a conversion coating and paint system; AZ91C is the standard-purity, lower-cost alternative. AZ91E has a density of 1.81 g/cm³ (0.0654 lb/in³), heavier than 58% of magnesium alloy grades. It melts at 470°C (878 °F). AZ91E has a yield strength of 145 MPa (21 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 51% of magnesium alloy grades. Elongation at break is 6% and the elastic modulus is 45 GPa (6.53 Msi).
What is AZ91E used for?
- Structural sand castings
- Aerospace and helicopter gearbox housings
- Corrosion-exposed equipment enclosures
- Permanent-mold pump and valve bodies
- Motorsport suspension and chassis castings
- Portable equipment frames
Limitations
- Low fracture toughness — 12 MPa·√m (10.9 ksi·√in), worse than 92% of magnesium alloy grades
- Low electrical conductivity — 12 % IACS, worse than 78% of magnesium alloy grades
AZ91E properties
Typical room-temperature values for AZ91E-T6; bars are the position among magnesium alloy grades.
Physical3
AZ91E has a density of 1.81 g/cm³ (0.0654 lb/in³), heavier than 58% of magnesium alloy grades. It melts at 470°C (878 °F).
Mechanical14
AZ91E has a yield strength of 145 MPa (21 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 51% of magnesium alloy grades. Elongation at break is 6% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
AZ91E is rated for continuous service to 150°C (302 °F). It conducts heat at 72 W/m·K (41.6 BTU/hr·ft·°F), worse than 69% of magnesium alloy grades. Thermal expansion is 26 µm/m·K (14.4 µin/in·°F).
Electrical3
AZ91E conducts electricity at 12 % IACS, worse than 78% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), better than 88% of magnesium alloy grades.
Sustainability4
Producing a kilogram of AZ91E takes about 330 MJ of energy and emits 30 kg of CO₂ — less than 56% of magnesium alloy grades. Typical recycled content is 15%.
Manufacturability8
AZ91E's machinability is excellent (95/100, better than 54% of magnesium alloy grades); weldability very good (70/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the magnesium alloy family
Yield strength against density for every magnesium alloy grade FabDigit runs. AZ91E is highlighted; hover a dot for its name, or open the interactive family chart.
Working with AZ91E
Is AZ91E easy to machine?
Cuts extremely freely at high speed with sharp positive-rake tools and low forces; use dry or mineral-oil cutting (never water-based) and manage fine chips/dust for fire risk.
Can AZ91E be welded?
Readily GTAW/GMAW welded with AZ92A or AZ101A filler under Ar; preheat thick sections and re-solution/age or stress-relieve to restore properties and avoid SCC.
Can AZ91E be formed, bent or molded?
Sand and permanent-mold casting alloy with excellent fluidity; needs SF6-free protective cover gas or flux, generous feeding and hot-tearing-aware gating — no cold forming.
AZ91E chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Al | 8.1 – 9.3 | 8.7 |
| Zn | 0.4 – 1 | 0.7 |
| Mnmin Mn also tied to Fe/Mn ratio control | 0.17 – 0.35 | 0.25 |
| Si | ≤ 0.2 | |
| Cuhigh-purity limit vs 0.10 for AZ91C | ≤ 0.02 | |
| Nihigh-purity limit | ≤ 0 | |
| Fehigh-purity limit — key to corrosion performance | ≤ 0.01 | |
| Other (each) | ≤ 0.01 | |
| Others (total) | ≤ 0.3 | |
| Mg | balance |
What surface finishes work on AZ91E?
Requires chromate-free conversion coating (or Dow 17 / HAE / PEO) plus epoxy primer and topcoat; isolate all steel/aluminium fasteners to prevent galvanic attack.
Equivalent designations
Standards and trade names that resolve to Magnesium Alloy AZ91E in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- M11919
How much does AZ91E cost?
AZ91E is a standard-cost magnesium alloy ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
AZ91E — frequently asked
What is AZ91E used for?
AZ91E is typically used for structural sand castings, aerospace and helicopter gearbox housings, corrosion-exposed equipment enclosures, permanent-mold pump and valve bodies, motorsport suspension and chassis castings and portable equipment frames. In short: high-purity AZ91 casting grade; best ductility in family; weldable structural magnesium.
What is the yield strength of AZ91E?
AZ91E has a typical yield strength of 145 MPa (21 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 51% of magnesium alloy grades. Strength varies by condition: see the 4 listed tempers.
Is AZ91E easy to machine?
Yes — machinability is rated excellent (95/100, better than 54% of magnesium alloy grades). Cuts extremely freely at high speed with sharp positive-rake tools and low forces; use dry or mineral-oil cutting (never water-based) and manage fine chips/dust for fire risk.
Can AZ91E be welded?
Yes — weldability is rated very good (70/100). Readily GTAW/GMAW welded with AZ92A or AZ101A filler under Ar; preheat thick sections and re-solution/age or stress-relieve to restore properties and avoid SCC.
What surface finishes work on AZ91E?
Requires chromate-free conversion coating (or Dow 17 / HAE / PEO) plus epoxy primer and topcoat; isolate all steel/aluminium fasteners to prevent galvanic attack.
Can AZ91E be formed, bent or molded?
Sand and permanent-mold casting alloy with excellent fluidity; needs SF6-free protective cover gas or flux, generous feeding and hot-tearing-aware gating — no cold forming.
What is the maximum service temperature of AZ91E?
AZ91E is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between AZ91E-T6 and AZ91E-T4?
T6 is the default condition — standard structural condition: best combination of yield strength, hardness and fatigue for gearbox and housing castings. T4: pick when maximum ductility, toughness and impact resistance matter more than yield strength. Yield strength is 145 MPa in T6 versus 90 MPa in T4.
How much does AZ91E cost?
AZ91E is a standard-cost magnesium alloy ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM B80 — Magnesium-Alloy Sand Castings — ASTM International (2015)
- ASTM B199 — Magnesium-Alloy Permanent Mold Castings — ASTM International (2019)
- ASTM B93/B93M — Magnesium Alloys in Ingot Form for Sand, Permanent Mold and Die Castings — ASTM International (2020)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Specialty Handbook: Magnesium and Magnesium Alloys — ASM International (1999)
- SAE AMS 4446 / UNS M11919 designation data — SAE International (2018)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.