メカニカルアロイング法により作製したAl-Mg-酸化物系およびAl-Mg-けい化物系P/M材

概要

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With a purpose of obtaining materials of high specific strength at room and high temperatures, Al-8mass% Mg alloy powder was mechanically alloyed with addition of metal oxide (B2O3, Sc2O3, TiO2, SrO, CeO2) and metal silicide (CrSi2, TiSi2, ZrSi2, WSi2, MoSi2) powders. Solid state reactions during mechanical alloying (MA) and subsequent heating were studied. The MA powders were consolidated to the P/M materials by vacuum hot pressing and hot extrusion, and their structures and mechanical properties were studied.All added oxides but TiO2 were decomposed during heating of MA powders, and aluminide compounds and spinel (MgAl2O4) were formed. All added silicides were only partially decomposed and Mg2Si was formed during heating of MA powders. The P/M materials of Al-Mg-oxide systems are harder and less ductile than those of Al-Mg-silicide systems. The highest hardness of 237 HV was obtained on the Al-Mg-B2O3 P/M material. The P/M material of Al-Mg-CrSi2 showed the highest tensile strength of 578 MPa.