繊維強化マグネシウム合金の熱的寸法安定性におよぼす急冷時応力負荷の影響

抄録

It is known that the thermal dimensional stability of fiber reinforced metal is controlled by the thermal stress due to the difference in the thermal expansion coefficient between the fiber and the matrix. In this study, the possibility to improve the thermal dimensional stability by controlling the thermal stress is discussed in a short alumina fiber reinforced magnesium alloy (FRMg). The thermal stress is controlled by the method that the specimen length is kept almost constant during quenching using a jig. The results show that the specimen length of the FRMg quenched under no such constraint increases along the fiber orientation during subsequent annealing, whereas little dimensional changeu is induced in the FRMg quenched under constraint. The superior dimensional stability of FRMg is ascribed to the fact that the tensile residual stress in the matrix due to the thermal stress is relaxed by the slip deformation induced upon quenching under constraint.