Dynamic deformation behavior of 93W-5.6Ni-1.4Fe heavy alloy prepared by spark plasma sintering

被引：36
|
作者：
Hu, Ke [1 ,2 ]
Li, Xiaoqiang [1 ]
Guan, Mo [1 ]
Qu, Shengguan [1 ]
Yang, Xinyu [2 ]
Zhang, Jiuxing [2 ]
机构：
[1] S China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou 510640, Guangdong, Peoples R China
[2] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2016年 / 58卷
基金：
中国国家自然科学基金;
关键词：
Tungsten heavy alloy; SPS; Grain refinement; Dynamic compression; HOT-HYDROSTATIC EXTRUSION; W-NI-FE; MECHANICAL-PROPERTIES; GRAINED TUNGSTEN; SHEAR LOCALIZATION; STRAIN RATES; TEMPERATURE; ALUMINUM; MICROSTRUCTURE; SUSCEPTIBILITY;
D O I：
10.1016/j.ijrmhm.2016.04.010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, split Hopkinson pressure bar was used to evaluate the dynamic deformation behavior of the 93W-5.6Ni-1.4Fe heavy alloy (93WHA) prepared by spark plasma sintering (SPS) and conventional liquid-phase sintering (as). The influence of the microstructural characteristics (such as W grain size, W-W contiguity and volume fraction of the matrix) on the dynamic deformation behavior was investigated. In contrast to the conventional liquid-phase sintered 93WHA, the spark plasma sintered 93WHAs exhibit high yield strength and flow stress during high strain rate compression, due to the decreased mean matrix thickness (the mean matrix thickness is related to the W grain size, W-W contiguity and volume fraction of the matrix). The decreased matrix mean thickness and increased number of grain boundaries in the spark plasma sintered 93WHAs result in an increase of aspect ratio of W grains in the core of the deformed specimen and a decreased width of shear band along the direction of maximum shear stress. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：117 / 124
页数：8
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