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In situ synchrotron X-ray diffraction analysis of deformation behavior of a nb/niti composite for biomedical applications

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Rare Metals 2021年第3期40卷 600-606页

作者： Shun Guo Rui-Tang Wu Yu-Lu Shi Yan-Pin Hou Wen Ma Guang-Lei Liu Hai-Xia Liu Xiao-Nong Cheng School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China Youke Publishing Co. Ltd.GRINM Group Co.Ltd.Beijing 100088China

The deformation behavior involved in nb/niti composite for biomedical applications within a large macroscopic strain range was investigated by tensile loading-unloading test and in situ synchrotron X-ray diffraction(SXRD).Experimental results show that during loading,the nb/niti composite experiences the elastic elongation of B2-niti austenitic,B19’-niti martensitic and β-nb phases,B2→ B19’ stress-induced martensitic(SIM) transformation and tensile plastic deformation of β-nb *** unloading,the deformation behavior involved in nb/niti composite includes the elastic recovery of B2-niti austenitic,B19’-niti martensitic and β-nb phases,reverse phase transformation B19’→B2 and compressive deformation of p-nb *** martensitic transformation in this composite is almost reversible and occurs in a localized *** results might contribute to a comprehensive understanding of the deformation mechanism involved in nb/niti composite and shed some light on design and development of novel composites with a combination of good biocompatibility and excellent superelasticity for biomedical applications.

关键词： nb/niti composite Deformation behavior Superelasticity Localized martensitic transformation

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In-situ synchrotron X-ray diffraction investigation on deformation behavior of nb/niti composite during pre-straining process

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Transactions of Nonferrous Metals Society of China 2022年第8期32卷 2609-2619页

作者： Shun GUO Hui-hui ZHANG Min-kyung KWAK Wang DING Guang-lei LIU Wen MA Hai-xia LIU Qing-kun MENG Xin-qing ZHAO School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Korea Youke Publishing Co. Ltd.Grinm Group Co.Ltd.Beijing 100088China School of Materials Science and Engineering China University of Mining and TechnologyXuzhou 221116China School of Materials Science and Engineering Beihang UniversityBeijing 100191China

The mechanisms responsible for deformation behavior in nb/niti composite during pre-straining were investigated systematically using in-situ synchrotron X-ray diffraction, transmission electron microscopy and tensile test. It is shown that upon loading, the composite experiences elastic elongation and slight plastic deformation of B19′,B2 and β-nb phases, together with the forward stress-induced martensitic(SIM) transformation from B2 to B19′. Upon unloading, the deformation mechanisms of the composite mainly involve elastic recovery of B19′, B2 and β-nb phases,compression deformation of β-nb phase and incomplete B19′→B2 reverse SIM transformation. In the tensile loading-unloading procedure, besides the inherent elastic deformation and SIM transformation, the(001) compound twins in B19′ martensite can also be conducive to the elastic deformation occurring in B19′-phase of the ***, this composite can exhibit a large recoverable strain after unloading owing to the elastic deformation, and the partially reversible and consecutive SIM transformation together with the(001) compound twins.

关键词： nb/niti composite near-linear deformation behavior large recoverable strain martensitic transformation

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