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,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.]
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
投稿时间:2016-01-11  修订日期:2016-05-31
中文关键词:  钛合金  软回收  层裂  断裂机理
基金项目: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)
中文摘要:
      利用平板撞击实验和样品软回收技术,结合光学显微镜(OM)、扫描电子显微镜(SEM)等微观分析手段,研究了动高压加载条件下Ti-6Al-4V和Ti-47Nb两种不同类型钛合金的层裂微结构特征与断裂机理。实验表明:Ti-6Al-4V合金的抗层裂破坏能力强于Ti-47Nb合金,其原因在于Ti-6Al-4V合金的高强度。Ti-6Al-4V合金层裂微孔洞大多在α/β两相界面处形核并沿相界扩展,而Ti-47Nb合金中的微裂纹是通过微孔洞直接连通形成。随后汇合的大空洞或大裂纹间形成的绝热剪切带(ASB)加速了试样层裂破坏的产生,Ti-6Al-4V与Ti-47Nb合金均表现出了韧性断裂特征。
Spall microstructure evolution of Ti-6Al-4V and Ti-47Nb titanium alloys at the dynamic high-pressure loading
英文关键词:Titanium alloys  Soft-capture  Spall fracture  Failure mechanism
英文摘要:
      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.
作者单位E-mail
刘慧 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室 1022579927@qq.com 
于晓东 北京理工大学 材料科学与工程学院 yuxiaodong.bit@163.com 
谭成文 北京理工大学 材料科学与工程学院  
赵慧林 北京理工大学材料科学与工程学院  
陈秀娟 兰州理工大学 机电工程学院  
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