Microstructure and low cycle fatigue of a Ti2Al Nb-based lightweight alloy

被引：11
作者：
Yinling Zhang [1 ,2 ]
Aihan Feng [1 ,3 ]
Shoujiang Qu [1 ,3 ]
Jun Shen [1 ,4 ]
Daolun Chen [2 ]
机构：
[1] School of Materials Science and Engineering, Tongji University
[2] Department of Mechanical and Industrial Engineering, Ryerson University
[3] Shanghai Key Laboratory of D&A for Metal-Functional Materials, School of Materials Science & Engineering, Tongji University
[4] College of Mechatronics and Control Engineering, Shenzhen University
来源：
Journal of Materials Science & Technology | 2020年 / 44卷 / 09期
基金：
加拿大创新基金会; 加拿大自然科学与工程研究理事会; 中国国家自然科学基金;
关键词：
Ti2AlNb-based alloy; Cyclic deformation; Low cycle fatigue; Fatigue life prediction; Fracture;
D O I：
暂无
中图分类号：
V252 [金属材料]; TG146.23 [];
学科分类号：
0805 ; 080502 ;
摘要：
TiAl Nb-based intermetallic compounds are considered as a new category of promising lightweight aerospace materials due to their balanced mechanical properties. The aim of this study was to evaluate monotonic and cyclic deformation behavior of an as-cast Ti-22 A1-20 Nb-2 V-1 Mo-0.25 Si(at.%) intermetallic compound in relation to its microstructure. The alloy containing an abundant fine lamellar O-TiAl Nb phase exhibited a good combination of strength and plasticity, and superb fatigue resistance in comparison with other intermetallic compounds. Cyclic stabilization largely remained except slight cyclic hardening occurring at higher strain amplitudes. While fatigue life could be described using the common Coffin-Mason-Basquin equation, it could be better predicted via a weighted energy-based approach.Fatigue crack growth was characterized mainly by crystallographic cracking, along with fatigue striationlike features being unique to appear in the intermetallics. The results obtained in this study lay the foundation for the safe and durable applications of TiAl Nb-based lightweight intermetallic compounds.
引用
收藏
页码：140 / 147
页数：8
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