Microstructures and hardness of Al-1.6%Cr-1.6%Zr alloy prepared by hot-extrusion of rapidly solidified powder.
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Microstructures and hardness of an Al-1.63%Cr-1.64%Zr alloy prepared by hot-extrusion of rapidly solidified powder were investigated. Vickers microhardness of the as-extruded alloy ranges from 115 to 135. Transmission electron microscopy observation shows that the dislocation density of the as-extruded alloy is high and that a number of granular Al7Cr preipitates and fine metastable L12-type Al3Zr prepitates are formed on grain boundaries and in grains. After annealing at 573K for 3.6×103ks, the hardness of the alloy remains un-changed and recrystallized grains are not observed in the alloy. It is concluded from TEM observation that the Al3Zr and Al7Cr precipitates in the grains and the Al7Cr precipitates on the grain boundaries suppress the recrystallization and softening.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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