Effect of niobium addition on the microstructure, transformation temperatures, and shape memory effect of Cu-Al-Ni-Ti shape memory alloys

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-03-15 DOI:10.1016/j.msea.2025.148181

Arya Mohammadzadeh, Shahram Raygan

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引用次数: 0

Abstract

This research aims to study the effect of adding Nb element on the microstructure, transformation temperatures, mechanical properties, and shape memory effect of Cu-Al-Ni-Ti alloys prepared by the vacuum arc remelting method. Various analyses, such as optical microscopy, scanning electron microscopy, and transmission electron microscopy, were used to investigate the microstructure, the differential scanning calorimetry test to study the transformation temperatures, and X-ray diffraction to study the existing phases. The obtained results showed that by adding 0.5 (wt.%) Nb element to Cu-13Al-4Ni-0.7Ti (wt.%) alloy with martensitic structure at room temperature, the grain size decreased from 260 to 188 μm, and the failure stress and strain increased from 361 MPa and 6.4 % to 506 MPa and 7.9 %, respectively. Microscopic studies indicated the formation of Nb-rich second-phase particles next to Ti-rich phases in the alloy microstructure. The Cu-13Al-4Ni-0.7Ti-0.5Nb alloy (wt.%) exhibited transformation temperatures

M_{s}

M_{f}

A_{s}

, and

A_{f}

equal 110, 86, 131, and 163 °C, respectively. This alloy possesses a high potential for practical applications due to its 100 % recoverability with a pre-strain of 2 %.

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.