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On the lüders band formation and propagation in NiTi shape memory alloys

Journal of Materials Science & Technology 2022年第21期116卷 22-29页

作者： Bashir S.Shariat Yingchao li Hong Yang Yunzhi Wang Yinong liu Department of Mechanical Engineering The University of Western Australia35 Stirling HighwayPerthWA 6009Australia Department of Materials Science and Engineering The Ohio State UniversityColumbusOH 43210USA

Near-equiatomic NiTi shape memory alloys are known to exhibit lüders-type deformation associated with a stress-induced *** studies have been conducted in the past mainly focusing on the macroscopic characteristics of the phenomenon and some theories have been proposed in the literature to explain its mechanisms,but some aspects of this phenomenon are still unclear,particularly at the microscopic *** study investigated the local strain evolution during the initiation and propagation of lüders band in a pseudoelastic NiTi alloy during tensile deformation by means of digital image correlation(DIC)*** on the evidence collected,distinct stages of lüders band formation and propagation are defined and the corresponding local strain rates are *** local strain rates are much higher than the global strain rate of the testing,giving insight to the mechanism of this phenomenon.

关键词： Shape memory alloy(SMA) NiTi Martensitic transformation lüders-type deformation lüders band Digital image correlation(DIC)

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Effect of lüders bands by Strain Ageing on Strain Distribution,Microstructure and Texture Evolution of High-Strength Pipe Steel

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Acta Metallurgica Sinica(English letters) 2021年第5期34卷 657-667页

作者： Jian Han Jun Wang Sunusi Marwana Manladan Yangchuan Cai Qian Wang Zhixiong Zhu lisong Zhu lianzhong lu Zhengyi Jiang School of Materials Science and Engineering Tianjin University of TechnologyTianjin300384China School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongongNSW2522Australia School of Materials Science and Engineering Tianjin UniversityTianjin300072China School of Materials Science and Engineering Hefei University of TechnologyHefei230009China

In this study,the high-strength pipe steel,i.e.X80,was heated at 260℃for half an hour followed by air cooling for thermal simulation of pipe coating *** the uniaxial loading of the specified tension samples,the migration behaviour of lüders bands and the re-distribution of stress after strain ageing heat treatment were investigated using digital image *** image correlation was adopted to characterise the local axial and shear strain fields of samples that were extracted from different locations across the wall thickness of the high-strength pipe steel,and electron backscatter diffraction was used to compare the evolution of crystallographic texture among these *** characterisation methods regarding microstructure and mechanical properties were conducted meanwhile,including optical microscopy,scanning electron microscopy and X-ray diffraction to accurately define the detailed performances that strain ageing,*** heated to 260℃for half an hour,has led *** obtained results show that the lüders band-related microstructure,dislocation density,lattice constant and texture vary at the different locations across the wall thickness and influence the fi nal mechanical properties of the selected high-strength pipe steel.

关键词： High-strength pipe steel lüders band Strain ageing Stress distribution Texture Mechanical property

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