热处理对铜基形状记忆带组织和热性能的影响

Pub Date : 2022-09-20 DOI:10.15255/kui.2022.011

S. Kožuh, I. Ivanić, T. Holjevac Grgurić, M. Gojić

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引用次数: 1

摘要

本研究的目的是研究Cu-Al-Mn和Cu-Al-Mn- ti合金在带状淬火后的显微组织、相变温度和热性能的变化。本文介绍了用熔体纺丝技术制备带状形状记忆合金Cu-Al-Mn和Cu-Al-Mn- ti的显微组织和热性能分析结果。淬火前后分别进行了显微组织分析。浇注后，在900℃下退火30 min，然后水淬。采用光学显微镜、扫描电镜、能谱仪和x射线衍射仪对样品进行了显微结构分析。利用Ther- mo- calc5软件对Cu-Al-Mn三元体系在平衡状态下的热力学进行了计算。采用差示扫描量热法和电阻法测定相变温度。显微组织分析结果表明，Cu-Al-Mn合金淬火前后均存在马氏体组织，而Cu-Al-Mn- ti合金淬火后才存在马氏体组织。淬火和加入钛后，相变温度降低。

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Effect of Heat Treatment on Microstructure and Thermal Properties of Cu-based Shape Memory Ribbons

The aim in this work was to investigate the change in microstructure, phase transformation temperatures, and thermal proper- ties due to the quenching of the investigated Cu-Al-Mn and Cu-Al-Mn-Ti alloys in ribbon form. This paper presents the results of microstructure analysis and thermal properties of Cu-Al-Mn and Cu-Al-Mn-Ti shape memory alloys produced in ribbon form by melt spinning technique. The microstructural analysis was carried out before and after quenching. After casting of the investigated alloys, annealing at 900 °C for 30 min was performed, followed by water quenching. The microstructural analysis was carried out by optical and scanning electron microscopy equipped with an energy dispersive spectrometer and by X-ray diffractometer. Thermodynamic calculation of a ternary Cu-Al-Mn system in equilibrium condition was performed using Ther- mo-Calc 5 software. Phase transformation temperatures were determined by differential scanning calorimetry and electrical resistance measuring. The results of microstructural analysis show the presence of martensite microstructures before and after quenching in the Cu-Al-Mn alloy, while in the Cu-Al-Mn-Ti alloy martensite microstructure exists only after quenching. Phase transformation temperatures decreased after quenching and titanium addition.

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