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Two medium-strength Al Mg Si alloys exhibited environmental embrittlement when deformed in laboratory air at low strain rates. Tensile specimens prepared from hot rolled plates of Al 0.75Mg 0.75Si and Al 0.75Mg 0.75Si 0.35Cu alloys were solution treated for 1 h at 540°C, quenched in water and aged for 30 min at 175°C. They were deformed in tension at initial strain rates ranging from 1.7×10-7 to 8.3×10-4 s-1 in a laboratory air with a relative humidity of 40 80. Both alloys showed ductile transgranular fracture when tested at a strain rate of 8.3×10-4 s-1 , however, they exhibited intergranular embrittlement with lower tensile elongation and reduction in area when tested at a strain rate of 1.7×10-7 s-1. This tendency of intergranular embrittlement is prominent in the Al 0.75Mg 0.75Si 0.35Cu alloy and the eŠect of hydrogen absorbed from the test environment on such embrittlement was studied using deuterium as a tracer of hydrogen.

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