摘要
采用磁悬浮区域熔炼的方法，制备了ＰＳＴ晶体，在８００℃对其压缩性能进行了测试，并对其变形组织进行了观察。结果表明，在８００℃时的屈服强度取决于片层界面与压缩轴的夹角，在＝９０°时屈服强度为最高，而＝４５°为最低。８００°时屈服强度有较大程度的下降，这与α２相中锥面滑移系｛１１２１｝〈１１２６〉的临界分切应力的降低有关。
Ti 48at%Al crystals containing a single set of lamellae with parallel planes (PST crystal) were grown by a magnetically suspended flowing zone method.The compressive yield stress of PST crystals was measured at 800℃.The results show that the compressive yield stress of the PST crystal depends on the angle between the lamellar boundaries and compressive axis.The yield stress is lowest for =45°,and highest for =90°.The yield stress for =90° decreasing by a big margin at 800℃ is related to the decrease of the CRSS for {1121}〈1126〉.
出处
《航空材料学报》
EI
CAS
CSCD
1998年第1期1-6,共6页
Journal of Aeronautical Materials
基金
国家自然科学基金
航空科学基金
