文献类型：期刊文献

英文题名：Microstructural mechanism underlying the stress recovery behavior of a Fe-Mn-Si shape memory alloy

作者：Li, Wenjie Zuo, Shungui Khedr, Mahmoud Li, Xiang Xiong, Kai Xiao, Fei

第一作者：Li, Wenjie

通信作者：Zuo, SG[1]

机构：[1]Shanghai Univ Engn Sci, Sch Mat Sci & Engn, Shanghai 201620, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China;[3]Benha Univ, Fac Engn Shoubra, Mech Engn Dept, Cairo 11629, Egypt;[4]Univ Oulu, Kerttu Saalasti Inst, Future Mfg Technol FMT, FI-85500 Nivala, Finland;[5]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[6]Yunnan Univ, Sch Mat & Energy, Kunming 650091, Peoples R China

第一机构：Shanghai Univ Engn Sci, Sch Mat Sci & Engn, Shanghai 201620, Peoples R China

通信机构：corresponding author), Shanghai Univ Engn Sci, Sch Mat Sci & Engn, Shanghai 201620, Peoples R China.

年份：2024

卷号：30

起止页码：5394-5401

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：;EI(收录号：20241916035259);Scopus(收录号：2-s2.0-85192101799);WOS:【SCI-EXPANDED(收录号:WOS:001234589100001)】；

基金：This paper was supported by the Class III Peak Discipline of Shanghai-Materials Science and Engineering (High -Energy Beam Intelligent Processing and Green Manufacturing) .

语种：英文

外文关键词：FeMnSi; Shape memory alloy; Recovery stress; Martensitic transformation; Pre-strain

摘要：Recovery stress governs the prestress strengthening effect of Fe-Mn-Si-based shape memory alloys in civil engineering applications. Although the effects of grain size, texture, and precipitates on recovery stresses have been extensively studied, the generation of recovery stress has not been thoroughly discussed regarding martensite growth behavior, especially considering the interaction of martensite variants. This study investigates the stress recovery and epsilon martensite growth behavior of a Fe-30Mn-6Si-5Cr (wt.%) alloy subjected to varying levels of deformation. The Fe-30Mn-6Si-5Cr (wt.%) alloy exhibits a yield strength of approximately 450 MPa, with an ultimate elongation of 44 % and a tensile strength of 950 MPa observed in uniaxial incremental cyclic tensile tests. Additionally, the results reveal an initial increase in recovery stress with pre-strain, peaking at 7 %, followed by a subsequent decrease with further deformation. With increasing pre-strain, the primary epsilon martensites initially grow parallelly, followed by the appearance of secondary martensites with a different orientation, intersecting multiple parallel primary martensites along with the increasing density of dislocations and stacking faults. A microstructural mechanism is proposed to elucidate the stress recovery behavior, encompassing the impact of primary martensites and secondary martensites interaction, and the influence of dislocations and stacking faults. This work offers microstructural scenarios that help to understand the generation of recovery stress and provides guidance for regulating recovery stress in Fe-Mn-Si-based shape memory alloys for civil engineering applications requiring prestress strengthening.