Dynamic deformation behavior of 93W-5.6Ni-1.4Fe heavy alloy prepared by spark plasma sintering. (August 2016)

• Record Type: Journal Article
• Authors: Hu, Ke; Li, Xiaoqiang; Guan, Mo; Qu, Shengguan; Yang, Xinyu; Zhang, Jiuxing
• Is Part Of: International journal of refractory metals & hard materials. Volume 58(2016:Sep.)
• Page Start: 117
• Page End: 124
• Publication Date: 2016-08
• Subjects: Tungsten heavy alloy -- SPS -- Grain refinement -- Dynamic compression; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2016.04.010
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: 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 (CLS). 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. Highlights: Fine-grained 93W–5.6Ni–1.4Fe heavy alloy was prepared by spark plasma sintering. Split Hopkinson pressure bar was used to evaluate dynamic deformation behavior. Deformation behavior and microstructure after dynamic compression was analyzed. Effect of microstructure on deformation behavior was analyzed by adapted KHL model.