钨合金的层裂强度研究  

STUDY ON THE SPALLATION BEHAVIOR OF TUNGSTEN ALLOY

作　　者：曾元金[1] 经福谦[1] 张万甲[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,成都523信箱610003

出　　处：《高压物理学报》1992年第1期58-67,共10页Chinese Journal of High Pressure Physics

摘　　要：用压缩空气炮做冲击加载装置研究一种钨合金的层裂特性,加载应力峰值为5—10GPa,加载应力时间宽度为0.2～0.6μs。实验用钨合金由粉末热压烧结制成,是一种均匀混合材料。它的成份重量百分比为W(90％)、Ni(6.8％)、Fe(2.7％)和Cr(0.5％)。由锰铜压阻计测量样品靶后界面应力历史表明,此种钨合金的层裂强度与拉伸应力率的平方根星单调递增关系。与加载应力峰值无关。回收样品的金相分析结果表明,此钨合金的拉伸断裂主要发生在铁镍混合物部位,钨晶粒的穿晶断裂只占很小部分。断口上的“杯状”凹坑表明,它主要属延性断裂机制。Spallation behavior of a kind of tungsten alloy, with composition percent by weight W90%-Ni6. 8%-Fe2. 7%-Cr0. 5% and manufactured by powder metallurgical method, was investigated by using a compressed gas gun as impact loading device. The peak stress in target is 5-10GPa, stress duration 0. 2-0. 6μs. The stress history measured by man-ganin gauge embeded in target/window interface demonstrated that the spallation strength of the tungsten alloy is a monotonic increasing function of square root of tensile stress rate and indepen- dent on the peak stress level. Metallographic analysis for the recovery sample showed that the tensile fracture of the tungsten alloy occurs mainly in the Fe-Ni mixture region with a few tran-scrystalline fracture in tungsten grain and there exhibits many 'cup-like' pits on the fractographic surface as well. It can be seen from those mentioned above that the tensile fracture of the tungsten alloy is essentially contributed to the ductile fracture mechanism.

关 键 词：钨合金 层裂 拉伸应力率 延性断裂 

分 类 号：TG146.411[一般工业技术—材料科学与工程]