摘要
为了预测细晶钨合金用作穿甲弹的高剪切毁伤效应,采用机械合金化(MA)和喷雾干燥-热还原两种方法制备含稀土的超细93W-Ni-Fe-Y2O3复合粉末,利用冷等静压液相烧结的方法制备Ф20mm-Ф25mm的晶粒度小于8μm的钨合金棒材。利用Hopkinson压杆装置对细晶钨合金进行了高应变率(〉10^3/s)下的动态力学性能研究,分析了应变、应变率、Y2O3等因素对细晶钨合金棒材的动态性能的影响。结果表明:钨合金在高应变率下会出现应变强化和热软化效应,在低应变时应力随着应变的增加而增加,当应变达到0.03后,应力随着应变的增加呈锯齿状上升趋势。钨合金在高应变率下会出现应变率强化效应,随着应变率的增加,应力增加。添加Y2O能提高材料的最大应力强度,提高钨合金的动态力学性能。
In order to forecast the damage effect of fine-grain tungsten heavy alloy, the tungsten alloy sticks of Ф20 mm-Ф25 mm were prepared by CIP and LPS. Dynamic mechanics properties were studied by Hopkinson experimental device. It was shown that the effects of strain-strengthening and therrnal-intenerating appeared at high strain velocity, and the stress increased with strain velocity increasing for the tungsten heavy alloy. By adding Y2O3 to the alloy, the stress and the dynamic mechanics properties were enhanced.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第4期633-635,共3页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50674106)
关键词
细晶钨合金
Y2O3
组织结构
动态力学性能
fine-grain tungsten heavy alloy
Y2O3, microstructure
dynamic mechanics properties