不同热机械处理后时效NiTiHf多晶体中双向形状记忆效应的循环稳定性

Cyclic Stability of Two-Way Shape Memory Effect in Aged NiTiHf Polycrystals after Various Thermomechanical Treatments.

作者信息

Panchenko Elena Y, Tagiltsev Anton I, Timofeeva Ekaterina E, Chumlyakov Yuriy I, Marchenko Ekaterina S

机构信息

Laboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenina Str. 36, 634050 Tomsk, Russia.

出版信息

Materials (Basel). 2023 Sep 12;16(18):6175. doi: 10.3390/ma16186175.

DOI:10.3390/ma16186175

PMID:37763453

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10532511/

Abstract

In the present paper, the cyclic stability of the high-temperature two-way shape memory effect was studied in high-strength NiTiHf polycrystals after various thermomechanical treatments-training (thermocycling under stress) and stress-induced martensite aging. The effect of training and stress-induced martensite aging on the microstructure, the two-way shape memory effect, and its cyclic stability was determined. It was found out that both thermomechanical treatments induce the high-temperature two-way shape memory effect at T > 373 K, with a strain of 1.5% in tension. The influence of cyclic tests (up to 100 stress-free cycles of cooling/heating) on the two-way shape memory effect strain, the transformation temperatures, and the microstructure was established. Different degradation mechanisms of the two-way shape memory effect were established after thermocycling and stress-induced martensite aging.

摘要

在本文中，研究了经过各种热机械处理（训练，即在应力下热循环）和应力诱导马氏体时效后的高强度NiTiHf多晶体中高温双向形状记忆效应的循环稳定性。确定了训练和应力诱导马氏体时效对微观结构、双向形状记忆效应及其循环稳定性的影响。结果发现，两种热机械处理均能在T>373K时诱导出高温双向形状记忆效应，拉伸应变达1.5%。确定了循环测试（高达100次无应力冷却/加热循环）对双向形状记忆效应应变、转变温度和微观结构的影响。热循环和应力诱导马氏体时效后，确定了双向形状记忆效应的不同退化机制。