Shape memory behavior of Ti–20Zr–10Nb–5Al alloy subjected to annealing treatment  

作　　者：Zhi-Guo Yu Cheng-Yang Xiong Peng-Fei Xue Yan Li Bi-Fei Yuan Wen-Tao Qu 

机构地区：[1]School of Materials Science and Engineering,Beihang University [2]Key Laboratory of Aerospace Materials and Performance (Ministry of Education),Beihang University [3]School of Mechanical Engineering,Xi’an Shiyou University

出　　处：《Rare Metals》2016年第11期831-835,共5页稀有金属（英文版）

基　　金：financially supported by the National Basic Research Program of China (No. 2012CB619400);the National Natural Science Foundation of China (No. 51371016);the Aeronautical Science Foundation of China (No. 2014ZF51070)

摘　　要：The effects of annealing temperature on microstructures, phase transformation, mechanical properties, and shape memory effect of Ti-20Zr-10Nb-5Al alloy were investigated. X-ray diffraction（XRD） patterns show that the alloy is composed of single hexagonal ɑ＇-martensite phase for both as-rolled sample and sample annealed at773 K for 30 min, while single orthorhombic ɑ＇＇ phase exists in the samples annealed at 873 and 973 K for30 min. The optical observations indicate that the alloy is recrystallized when annealed at 873 K, and the grain size of the sample annealed at 973 K is about five times larger than that annealed at 873 K. Both of the samples annealed at 873 and 973 K show almost the same reverse martensite transformation start temperature of 483 K as demonstrated by thermal dilatation tests. The critical stress values for martensite reorientation（σ_M） are 392 and 438 MPa for the alloys annealed at 873 and 973 K, respectively. The maximum shape memory strain is 2.8 %, which is obtained in the alloy annealed at 873 K due to the lower σ_M. Moreover,the sample annealed at 873 K exhibits larger tensile stress and tensile strain due to the smaller grain size.The effects of annealing temperature on microstructures, phase transformation, mechanical properties, and shape memory effect of Ti-20Zr-10Nb-5Al alloy were investigated. X-ray diffraction（XRD） patterns show that the alloy is composed of single hexagonal ɑ＇-martensite phase for both as-rolled sample and sample annealed at773 K for 30 min, while single orthorhombic ɑ＇＇ phase exists in the samples annealed at 873 and 973 K for30 min. The optical observations indicate that the alloy is recrystallized when annealed at 873 K, and the grain size of the sample annealed at 973 K is about five times larger than that annealed at 873 K. Both of the samples annealed at 873 and 973 K show almost the same reverse martensite transformation start temperature of 483 K as demonstrated by thermal dilatation tests. The critical stress values for martensite reorientation（σ_M） are 392 and 438 MPa for the alloys annealed at 873 and 973 K, respectively. The maximum shape memory strain is 2.8 %, which is obtained in the alloy annealed at 873 K due to the lower σ_M. Moreover,the sample annealed at 873 K exhibits larger tensile stress and tensile strain due to the smaller grain size.

关 键 词：Ti-Zr Shape memory alloy MARTENSITICTRANSFORMATION MICROSTRUCTURE 

分 类 号：TG139.6[一般工业技术—材料科学与工程]