摘要
利用SEM原位拉伸实验,研究了Ti555211合金具有初始双态组织的拉伸变形和断裂行为。结果表明:在拉伸载荷作用下,双态组织试样中滑移带优先出现在初生α相内(与拉伸轴呈45°),在裂纹扩展过程中,合金内滑移带的密度均随着载荷的增加逐渐增加,双态组织试样的断裂方式为微孔聚集型断裂。原位拉伸试样断口分析表明,韧性断裂是双态组织试样的主要断裂方式,双态组织试样断口没有明显剪切唇,存在小范围的剪切滑移造成的平坦面。SEM原位拉伸实验分析方法能够对该合金的变形和断裂行为进行实时跟踪,该方法的研究结果更加具有重大的理论价值和工程意义。
The tensile deformation and fracture behavior of the Ti555211 alloy with dual structure were investigated using in-situ SEM technology.Results show that slip bands are given priority within the primary α phase along with angle of 45° with the tensile loading direction for the Ti555211 alloy with initial dual structure.As the crack propagates,the density of the slip bands increases.Moreover,the crack growth is dominated by interconnected microcavities for the alloy with initial dual structure.The Ti555211 alloy with initial dual structure and lamellar structure show different fracture morphologies.For the alloy with initial dual structure,there display a small flat surface caused by shear slip,but no obvious shear lip occurs in fracture.The deformation and fracture behavior of the near-β titanium alloy of Ti555211 can be tracked by the SEM in-situ tensile test method in real time.The research results of this method have great theoretical value and engineering significance.
作者
安震
李天麒
鲁媛媛
丁旭
谢辉
毛小南
张平祥
李金山
An Zhen;Li Tianqi;Lu Yuanyuan;Ding Xu;Xie Hui;Mao Xiaonan;Zhang Pingxiang;Li Jinshan(Xi'an Aeronautical University,Xi'an 710077,China;Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第5期1584-1590,共7页
Rare Metal Materials and Engineering
基金
国家自然科学基金面上项目(51471136)
高等学校学科创新引智计划(“111”计划)(B08040)
