文献类型：期刊文献

英文题名：A Constitutive Relation Based on the Johnson-Cook Model for Ti-22Al-23Nb-2(Mo, Zr) Alloy at Elevated Temperature

作者：Wang, Yanju[1];Zhou, Duo[2];Zhou, Yi[1];Sha, Aixue[1];Cheng, Huaxing[2];Yan, Yabin[2]

机构：[1]AECC Beijing Inst Aeronaut Mat, Mat Evaluat Ctr Aeronaut & Aeroengine Applicat, Beijing 100095, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech Power & Engn, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2021

卷号：11

期号：7

外文期刊名：CRYSTALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000676477000001)】；

基金：This researchwas funded byNatural Science Foundation of Shanghai (GrantNo. 19ZR1413200), Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Major Project for Aero Engine-Gas Turbine ofMinistry of Industry and Information Technology, China (KH1B191503), Stably supporting key project of State Administration of Science, Technology and Industry for National Defense, China (KZ0C191708).

语种：英文

外文关键词：Ti2AlNb alloy; mechanical properties; constitutive relation; Johnson-Cook model

摘要：Although several schemes have been proposed to modify the classical Johnson-Cook (J-C) model, the effect of temperature on the flow stress of materials at different temperatures has not been clarified. In the current study, to investigate the deformation behavior of Ti-22Al-23Nb-2(Mo, Zr) alloy at different temperatures, uniaxial tension experiments were performed at both room (RT, 28 degrees C) and elevated temperatures, and a modified J-C model was developed to describe the temperature-dependent plastic flow. In tensile experiments, Ti2AlNb-based alloy showed a continuous work hardening until reaching the ultimate strength at RT, while an apparent drop appeared in the flow stress after the peak stress at elevated temperature. Moreover, the experimental peak stress significantly depends on the testing temperature. To correctly describe the different variations of flow stresses at different temperatures, a parameter, S, which represents the softening behavior of flow stress, is integrated into the classical J-C model. In addition, the applicability and validity of the proposed J-C model were verified by calibration with experimental curves of different temperatures. On the other hand, the fractography of post-test specimens was examined to interrupt the increased fracture brittleness of Ti2AlNb-based alloy at elevated temperatures. The proposed constitutive relation based on the J-C model is applicable to predict the deformation behavior of other Ti2AlNb-based alloys at different temperatures.