メカニカルアロイング法によるMg-Al-Zn系焼結合金の作製と機械的性質

抄録

Mg-Al-Zn type mixed powder was mechanically alloyed (MA) by using a planetary ball mill under Ar atmosphere. The MA powders were sintered by vacuum hot pressing (HP). The change of constituent phase of HP materials was examined by XRD and FE-EPMA. Its mechanical properties were evaluated by Vickers hardness and compression tests. HP material was obtained by processing MA powder with mean particle size of 5.6μm at 673 K for 18 ks. Its hardness and 0.2% proof strength became HV164 and 546 MPa, respectively. It is considered that this HP material shows high mechanical properties due to the fine dispersion of particles of Mg₁₇Al₁₂ phase.