New Tungsten Heavy Alloys with High Strength and Adiabatic Shearing Sensitivity:Using High-entropy Alloys as Matrix
A novel tungsten heavy alloys(WHAs)using high entropy alloy(HEA)as matrix was synthesized in this work.AlCrFeNiV HEA was chosen as the matrix material because of excellent mechanical properties.Before the synthesis,the wetting property of W by HEA melt was investigated,which shows a contact angle about 40°at 1500℃ and has little compound in the solid/liquid interface.Basing on the wetting property,85W-HEA(wt.%)was synthesized by liquid phase sintering method under argon or hydrogen atmosphere.The tungsten particles embed in HEA matrix distribute uniformly,exhibiting a high relative density over 98%.The composite has excellent mechanical property with ultimate tensile strength of 1100 MPa and elongation of 8%,which is attributed to the combination effects of the small grain size of W phase,high interface bonding strength and excellent mechanical property of HEA phase.The fracture mode of the composite is a typical brittle fracture.Transgranular fracture occurred in the W phase,while the tearing ridge formed in the HEA phase.To fully utilize the mechanical properties of HEA matrix,W-HEA was subjected to 15%deformation by rotary swage at ambient temperature,then aged at 700℃ for an hour.The strain strengthening and aging strengthening improve the quasi-static and dynamic compression yield strength of W-HEA.Under high strain rate about 4×103 s-1,adiabatic shear band(ASB)was observed in the aged samples.These results indicate that HEA could be a promising matrix material to design high performance WHAs.
Tungsten heavy alloys High-entropy alloys Metal matrix composites Wettability Mechanical property Adiabatic shear band
Zhou Shangcheng Zhu Yichao Jian Ruizhi Wang Benpeng Xue Yunfei Wang Lu Wang Fuchi
School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China
国际会议
北京
英文
737-745
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）