Negative temperature-dependence of stress-induced R→B19′ transformation in nanocrystalline NiTi alloy

IF 8.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Research Letters Pub Date : 2022-11-11 DOI:10.1080/21663831.2022.2141587

Taotao Wang, Xiangxiang Rao, Qiang Zhang, D. Jiang, Y. Ren, L. Cui, Kaiyuan Yu

引用次数: 1

Abstract

ABSTRACT The temperature dependence of the critical stress of R→B19’ transformation in NiTi shape memory alloys remains unclear due to the difficulties in precisely identifying the phase constitution and acquiring sole R phase. Here we investigate the thermally- and stress-induced martensitic transformation in a near-equiatomic nanocrystalline NiTi alloy. In situ synchrotron X-ray diffraction is used to identify the phase evolution such that the temperature window for sole R phase is firmly determined. We find that the temperature dependence of R→B19’ is negative (−0.2 MPa/K) in our alloy, in sharp contrast to 3–5 MPa/K reported. Possible reasons for the discrepancies are discussed. GRAPHICAL ABSTRACT IMPACT STATEMENT Negative temperature-dependence of stress-induced R→B19’ transformation was discovered for the first time in NiTi alloys, being in sharp contrast to previous reports. This calls for a revisit of such transformation.

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应力诱导R的负温度依赖性→纳米NiTi合金中B19′的相变

NiTi形状记忆合金R→B19′相变临界应力的温度依赖关系尚不清楚，这主要是由于难以精确识别相组成和获得单一R相。本文研究了近等原子纳米晶NiTi合金的热诱导和应力诱导马氏体相变。用原位同步x射线衍射法确定了R相的温度窗，从而确定了R相的温度窗。我们发现合金中R→B19′的温度依赖性为负(- 0.2 MPa/K)，与报道的3-5 MPa/K形成鲜明对比。讨论了产生差异的可能原因。本文首次在NiTi合金中发现了应力诱导R→B19′相变的负温度依赖性，这与以往的报道形成了鲜明的对比。这就要求我们重新审视这种转变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Research Letters Materials Science-General Materials Science

CiteScore

12.10

自引率

3.60%

发文量

审稿时长

3.3 months

期刊介绍： Materials Research Letters is a high impact, open access journal that focuses on the engineering and technology of materials, materials physics and chemistry, and novel and emergent materials. It supports the materials research community by publishing original and compelling research work. The journal provides fast communications on cutting-edge materials research findings, with a primary focus on advanced metallic materials and physical metallurgy. It also considers other materials such as intermetallics, ceramics, and nanocomposites. Materials Research Letters publishes papers with significant breakthroughs in materials science, including research on unprecedented mechanical and functional properties, mechanisms for processing and formation of novel microstructures (including nanostructures, heterostructures, and hierarchical structures), and the mechanisms, physics, and chemistry responsible for the observed mechanical and functional behaviors of advanced materials. The journal accepts original research articles, original letters, perspective pieces presenting provocative and visionary opinions and views, and brief overviews of critical issues.