Evalution of trade–off between superelasticity and hardness of NiTi alloy regarding wear resistance under heavy load and high–speed

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL Wear Pub Date : 2025-03-15 Epub Date: 2025-01-02 DOI:10.1016/j.wear.2025.205732

Zhongxiong Kang, Deyin Kong, Chaorui Jiang, Mengqi Liu, Zhihui Zhang, Jie Zhao

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Abstract

NiTi alloy fabricated by laser directed energy deposition (LDED) have gained widely attention in tribological applications. But the interplay effects of between superelasticity and hardness on the wear resistance are not clarified clearly. In this work, six NiTi sample with various superelasticity and hardness are fabricated using LDED to analyze the trade–off between the conflicting factors of superelasticity and hardness in terms of wear resistance under heavy load and high–speed condition. The ball–on–flat dry reciprocating sliding wear test are conducted on NiTi samples against an alumina ball. The result indicated that all samples are exhibited superelasticity of 17.6%–29.9 % and mean microhardness of 345–416HV_0.5. Importantly, the effects on wear resistance obey the following rules: superelasticity > synergistic enhancement of superelasticity and hardness > hardness > superelasticity and hardness mutually restricted. Additionally, the wear resistance mechanism is discussed in depth via wear morphology and acoustic emission signal.

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NiTi合金重载高速耐磨性超弹性与硬度权衡评价

激光定向能沉积法制备NiTi合金在摩擦学领域的应用受到了广泛的关注。但超弹性与硬度的相互作用对耐磨性的影响尚不清楚。本文利用lcd技术制备了6种不同超弹性和硬度的NiTi样品，分析了在重载和高速条件下，超弹性和硬度的冲突因素对其耐磨性的影响。对镍钛样品与氧化铝球进行了平球干往复滑动磨损试验。结果表明，所有样品的超弹性为17.6% ~ 29.9%，平均显微硬度为345 ~ 416hv0.5。重要的是，对耐磨性的影响遵循以下规则：超弹性>；超弹性与硬度协同增强>；硬度比;超弹性和硬度相互制约。此外，通过磨损形貌和声发射信号对其耐磨性机理进行了深入探讨。

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.