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ASTM AZ81A-T4
Category Magnesium Alloy
Designations United States: UNS S21900, ASTM A276, ASTM A580, ASTM A412

Composition
ElementWeight %
Al  7.60 
Mn  0.13 
Zn  0.70 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 1.8 25  
Poisson's Ratio 0.35 25  
Elastic Modulus (GPa) 44.8 25  
Tensile Strength (Mpa) 275.0  25  T4 (sand casting, permanent mold casting) 
Yield Strength (Mpa) 83.0 
Elongation (%) 15.0 
Reduction in Area (%)  
Hardness (HB500) 55  25  T4 (sand casting, permanent mold casting) 
Shear Strength (MPa) 125  25  T4 (sand casting, permanent mold casting) 

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Conductivity (W/m-K) 50.21  0  T4 
Glossary
FREE Publications
Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

more publications