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1、Rare Metal Materials and Engineering Volume 38, Issue 12, December 2009 Online English edition of the Chinese language journal Cite this article as: Rare Metal Materials and Engineering, 2009, 38(12): 20692074. AReceived date: November 30, 2008; Revised manuscript received date: August 5, 2009 Found
2、ation item: National Nature Science Foundation of China (50674106); National Natural Science Funds for Distinguished Young Scholars (50925416) and Creative Research Group of National Nature Science Foundation of China (50721003). Corresponding author: Fan Jinglian, Ph. D., Professor, State Key Labor
3、atory for Powder Metallurgy, Central South University, Changsha 410083, P. R. China, Tel: 0086-731-88836652, E-mail: Copyright 2009, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved. RTICLE2069Dynamic Behavior and Adiabatic Shear Bands in Fine- Graine
4、d W-Ni-Fe Alloy under High Strain Rate Compression Dynamic Behavior and Adiabatic Shear Bands in Fine- Grained W-Ni-Fe Alloy under High Strain Rate Compression Fan Jinglian1, Gong Xing1, Qi Meigui1, Liu Tao1, Li Shukui2, Tian Jiamin1 1 State Key Laboratory for powder Metallurgy, Central South Univer
5、sity, Changsha, 410083, China; 2 Beijing Institute of Technology, Beijing 100081, China Abstract: The effect of grain refinement and trace yttrium addition on dynamic behavior of 93W-4.9Ni-2.1Fe alloy was investigated. The true stress-strain curves obtained from dynamic compression tests show that s
6、train hardening and thermal softening effects are present in the alloy, and the maximum dynamic strength and elongation increase with increasing of strain rates. Compared with the conventional 93W-4.9Ni-2.1Fe alloy, the fine-grained 93W-4.9Ni-2.1Fe alloy exhibits relatively higher strength and elong
7、ation under the same compression condition. In particular, the occurrence of obvious adiabatic shear bands in fine-grained alloy under lower high-strain-rate (1900 s-1) indicates that the propensity to adiabatic shear localization are enhanced significantly by grain refinement. Additionally, trace y
8、ttrium addition can improve the dynamic strength and elongation of tungsten heavy alloy. Key words: 93W-4.9Ni-2.1Fe; grain refinement; adiabatic shear band; yttrium Tungsten heavy alloys (WHAs) are two-phase composites consisting of nearly spherical tungsten particles (tungsten phase) homogeneously
9、embedded in a ductile binder phase such as Ni-Fe binder etc. The combination of high strength, high density and good ductility makes the material extremely attractive for certain specialized applications, such as rocket nozzles in space crafts, balance supporting for systems of airplanes and militar
10、y applications1,2. In particular, the application in kinetic energy penetrators attracts a continual interest2. Due to the parallel quasi-static mechanical properties and free contamination compared to the depleted uranium (DU) alloys, WHAs become a hot material to substitute for the DU alloys. Howe
11、ver, WHAs are prone to form “mushroom-like head” rather than fail as adiabatic shear bands during high speed impacting. Hence, the penetration performance of WHAs penetrators is weakened remarkably in comparison with DU alloys. In order to improve the “self-sharpening effect” of WHAs, a great deal o
12、f researches were conducted in the past several decades, such as alloying component design, microstructure, deformation strengthening and dynamic mechanical behavior3-13. A. Bose et al.3 investigated the dynamic compression behavior of W-Ni-Mn alloy at the strain rate of 5000 s-1 by means of Split H
13、opkinson pressure bar (SHPB) and showed that the alloy was easy to form adiabatic shear bands that oriented along the direction of 45o with respect to the loading direction when the alloy was suffered the strain of 45%. A. Bose and co-workers4 reported that grain refinement was beneficial for WHAs t
14、o be deformed as shear localization during high strain rate loading. Weerasooriya et al.11 studied the effect of W-W contiguity on the dynamic failure. They showed that the propensity for flow localization was promoted greatly through decreasing the W-W contiguity. In addition, S.H. Park et al.12 fo
15、und that adding of yttria was beneficial to the refinement of grain structure and the enhancement of dynamic mechanical properties for WHAs, especially under no forming of adiabatic shear bands. The penetration performance of the alloy doped with yttria was improved substantially by the occurrence o
16、f “self-sharpening effect”. In this paper we systematically investigated the effect of strain rates, grain refinement and trace yttrium addition on the dynamic mechanical properties and the formation of adiabatic Fan Jinglian et al. / Rare Metal Materials and Engineering, 2009, 38(12): 20692074 shear bands of W-Ni-Fe alloy for further improvement of WHAs mechanical properties, especially the p
