メカニカルアロイングしたCu-Ti-B合金粉末の焼結特性に及ぼすミリング時間の影響 (粉末プロセスの制御と製品の評価<特集>)

概要

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Cu-8mass%Ti-4mass%B mixture powders were mechanically alloyed ror various times. They were compacted and then sintered at 1173K for 108ks. Change of the structure during the sintering was investigated. The mechanically alloyed powders with different milling times were piled up in four layers and compacted. They were sintered at 1173K for various times. The volume fraction of pore in the layer of the as-mixed powder increases with the increasing sintering time, but the porosity in the layer of the powder mecanically alloyed for long time decreases, thereby, the form of the sintered lamellate compact bent. The distribution of Vickers hardness in thickness direction in the sintered lamellate compact changes from stair-like to parabola with the increasing sintering time. The as-mixed and mechanically alloyed powders were piled up and compacted. 3-point-bending test of the sintered lamellate compact was carried out. In the bending test, fracture strength when tensile stress was applied in the layer of the as-mixed powder is higher than that in the layer of the mechanically alloyed powder.