Study on improving “self-sharpening” capacity of W–Cu–Zn alloy by the pressureless infiltration method
Study on improving “self-sharpening” capacity of W–Cu–Zn alloy by the pressureless infiltration method
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DOI：
10.1016/j.msea.2014.04.015
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发表时间：
2014-06
期刊：
影响因子：
6.4
通讯作者：
Xiaoliang Fang;Jin-Xu Liu;Xing Wang;Shu-kui Li;L. Zheng
中科院分区：
文献类型：
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作者：
Xiaoliang Fang;Jin-Xu Liu;Xing Wang;Shu-kui Li;L. Zheng
为了提高动能弹丸用钨高合金（WHA）的“自锐”能力，WHA不仅应具有高强度，而且应具有适当的临界剪切破坏应变。为了制备具有高强度和适当临界剪切破坏应变的WHA，在本研究中，通过W骨架渗入Cu-Zn合金制备了由80W-14Cu-6Zn组成的WHA。对微观结构和力学性能进行了系统研究。显微组织分析表明，W颗粒相连形成W骨架，W骨架的间隙被制备过程中旋节线分解产生的具有片状特征的α相Cu-Zn合金填充。由于基体中Zn的固溶强化作用，80W-14Cu-6Zn合金的静态屈服强度和动态屈服强度比80W-20Cu合金分别提高了200 MPa和400 MPa。此外，由于Cu-Zn合金基体具有适当的延展性，在单轴动态压缩试验下，80W-14Cu-6Zn合金的临界剪切破坏应变有效控制在0.2-0.4之间，有利于促进动能弹应用侵彻过程中的“自锐”效应。此外，还讨论了80W-14Cu-6Zn合金在动态压缩下的失效机制。弹道冲击实验证明80W-14Cu-6Zn合金表现出显着的“自锐”能力。
In order to improve the “self-sharpening” capacity of the tungsten heavy alloy (WHA) for kinetic energy projectile application, the WHAs should have not only high strength but also proper critical shear failure strain. For the purpose of fabricating the WHAs with high strength and proper critical shear failure strain, in the present study, the WHA composed of 80W–14Cu–6Zn was prepared by W skeleton infiltrated of Cu–Zn alloy. The microstructure and mechanical properties were systematically investigated. Microstructure analysis shows that W particles are connected to form W skeleton, and the interstice of W skeleton is filled up with α phase Cu–Zn alloy which has lamellar feature resulting from spinodal decomposition during the preparation process. Due to the solid solution strengthening effect of Zn in the matrix, the static yield strength and the dynamic yield strength of the 80W–14Cu–6Zn alloy are respectively enhanced by 200 MPa and 400 MPa compared with those of the 80W-20Cu alloy. Moreover, due to the proper ductility of the Cu-Zn alloy matrix, under the uniaxial dynamic compression test, the critical shear failure strain of the 80W–14Cu–6Zn alloy is effectively controlled within 0.2–0.4, which is beneficial to promote “self-sharpening” effect during the penetration process for kinetic energy projectile application. Additionally, the failure mechanism of the 80W–14Cu–6Zn alloy under dynamic compression was discussed. The ballistic impact experiment has proved that the 80W–14Cu–6Zn alloy exhibits remarkable “self-sharpening” capacity.