Ex situ measurement of strain associated with hot tearing in AZ91D and AE42 magnesium alloys using neutron diffraction

摘要

Abstract: Prevention of hot tearing during casting or welding of commercial alloys remains a challenge for numerous in-ndustrial applications. The tendency of an alloy to tear is related to the alloy’s microstructure, solidification rate, and thenstress/strain conditions it experiences during solidification. Due to technological challenges in performing accurate and re-nliable measurements, there remains a paucity of quantitative experimental data on the stress/strain conditions associatednwith the onset of hot hearing. This paper reports on a novel approach to quantify strain at the onset of hot tearing in twonmagnesium alloys. Neutron diffraction strain mapping was carried out and revealed that in the case of the AZ91D alloy,ntensile strain of *0.05% was associated with initiation of material’s plastic damage and hot tearing, while for the AE42nalloy the critical strain was *0.09%.