Microstructure and low cycle fatigue of a Ti2AlNb-based lightweight alloy

作     者：Yinling Zhang Aihan Feng Shoujiang Qu Jun Shen Daolun Chen Yinling Zhang;Aihan Feng;Shoujiang Qu;Jun Shen;Daolun Chen

作者机构：School of Materials Science and EngineeringTongji UniversityShanghai 201804China Department of Mechanical and Industrial EngineeringRyerson UniversityTorontoOntario M5B 2K3Canada Shanghai Key Laboratory of D&A for Metal-Functional MaterialsSchool of Materials Science&EngineeringTongji UniversityShanghai 201804China College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第44卷第9期

页      面：140-147页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (NSFC)(Grant No. 51871168) the Natural Sciences and Engineering Research Council of Canada (NSERC) in the form of international research collaboration China Scholarships Council (CSC) for providing a PhD student scholarship the financial support by the Premier’s Research Excellence Award (PREA) NSERC-Discovery Accelerator Supplement (DAS) Award Canada Foundation for Innovation (CFI) Ryerson Research Chair (RRC) program 

主　　题：Ti2AlNb-based alloy Cyclic deformation Low cycle fatigue Fatigue life prediction Fracture 

摘      要：Ti2AlNb-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-22A1-20Nb-2V-1Mo-0.25Si(at.%)intermetallic compound in relation to its microstructure.The alloy containing an abundant fine lamellar O-Ti2AlNb 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 Ti2AlNb-based lightweight intermetallic compounds.