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刘慧,于晓东,谭成文,赵慧林,陈秀娟.动高压加载条件下Ti-6Al-4V和Ti-47Nb合金层裂微结构演化规律的研究[J].稀有金属材料与工程(英文),2018,47(3):829~834.[Liu Hui,Yu Xiaodong,Tan Chengwen,Zhao Huilin,Chen Xiujuan.Spall microstructure evolution of Ti-6Al-4V and Ti-47Nb titanium alloys at the dynamic high-pressure loading[J].Rare Metal Materials and Engineering,2018,47(3):829~834.]
Spall microstructure evolution of Ti-6Al-4V and Ti-47Nb titanium alloys at the dynamic high-pressure loading
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Received:January 11, 2016  Revised:May 31, 2016
DOI:
Key words: Titanium alloys  Soft-capture  Spall fracture  Failure mechanism
Foundation item:国家自然科学基金资助(项目号51001014);国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliationE-mail
Liu Hui State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology 1022579927@qq.com 
Yu Xiaodong School of Material Science and Engineering,Beijing Institute of Technology yuxiaodong.bit@163.com 
Tan Chengwen 北京理工大学 材料科学与工程学院  
Zhao Huilin 北京理工大学材料科学与工程学院  
Chen Xiujuan School of Mechanical and Electronical Engineering,Lanzhou University of Technology  
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Abstract:
      Spall microstructure characteristics and failure mechanism of Ti-6Al-4V and Ti-47Nb titanium alloys were studied through plate impact experiments and “sample soft-capture” technology at the dynamic high-pressure loading, as well as careful microscopic analyses using optical microscopy and scanning electronic microscopy. The experiment indicates that Ti-6Al-4V alloys have stronger ability of spall resistance than Ti-47Nb alloys because of the high strength of Ti-6Al-4V alloys. The micro-voids in the spalled Ti-6Al-4V alloys almost nucleate at the α/β phase boundaries and propagate along the phase boundaries, and the micro-cracks of Ti-47Nb alloys are direct connected through micro-voids. Subsequently, adiabatic shear band formed between macroscopic voids or main cracks promote the spall fracture of samples. Ti-6Al-4V and Ti-47Nb alloys fracture with ductile characteristics.