层状Ti-Ta二元金属-金属复合材料的疲劳性能研究
Fatigue properties of binary Ti-Ta metal-metal composite with lamellar microstructure
徐圣航 1韩梦 1沈凯杰 2曹远奎 3付遨 3丁超 1汤慧萍1
作者信息
- 1. Advanced Materials Additive Manufacturing Innovation Research Center,Hangzhou City University,Hangzhou 310015,China
- 2. College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China
- 3. State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China
- 折叠
摘要
二元金属复合材料在航空航天、高端装备等领域具有广阔的应用前景.金属-金属之间的界面通常会对疲劳裂纹的萌生和传播产生影响,但目前关于层状金属-金属复合材料的疲劳性能的研究较为有限.本文通过粉末冶金方法制备一种Ti-Ta金属-金属层状结构复合材料,并进行热变形处理,系统研究了在不同交变应力下的疲劳寿命和断口形貌.结果表明:Ti-Ta金属-金属层状复合材料的疲劳强度为450 MPa,显著高于纯Ti的.在疲劳断口中,Ta区域呈现出明显的疲劳条纹特征,而Ti区域则在疲劳稳定传播区内呈现解理断裂.此外,Ti和Ta区域之间的界面可以抑制裂纹的扩展,并改变裂纹扩展的方向.由于裂纹传播的方向不断变化,疲劳断口表面呈现出一种"阶梯状"的微观结构.本研究为层状金属-金属复合材料的疲劳裂纹扩展提供了一种新的模型.
Abstract
Binary metal-metal composites are promising for advanced applications.In general,the interface between adjacent metals may have a great influence on generation and propagation of fatigue cracks.However,limited research has been devoted to investigating the fatigue properties of laminated metal-metal composites.Here,we fabricated a laminated Ti-Ta metal-metal composite through powder metallurgy method,followed by hot deformation subsequently.The fatigue life and the fracture surfaces under different alternating stresses were investigated systematically.The results reveal that the fatigue strength of the Ti-Ta metal-metal composite is 450 MPa,significantly surpassing that of pure Ti.The Ta area presents the fatigue striation characteristics while the Ti area shows the cleavage fracture inside the fatigue stable propagation region.Besides,the interfaces between Ti and Ta areas could restrict the crack growth and/or change the direction of crack propagation.Owing to the direction of crack propagation changing constantly,the fatigue fracture surfaces present a"step-like"microstructure,which is first reported in laminated metal-metal composite.This work provides a novel model for fatigue crack propagation in laminated metal-metal composite.
关键词
金属-金属复合材料/Ti-Ta合金/粉末冶金/疲劳性能/寿命预测/显微组织Key words
metal-metal composite/alloy Ti-Ta/powder metallurgy/fatigue properties/life prediction/microstructure引用本文复制引用
基金项目
Natural Science Foundation of Zhejiang Province,China(LQ21E040004)
State Key Laboratory of Advanced Metals and Materials,China(2021-Z03)
出版年
2023
NETL
NSTL
维普
万方数据