Achieving dual-phase structured Cu-Al-Mn-Si alloy with prominent shape memory properties via laser powder bed fusion

IF 10.3 1区工程技术 Q1 ENGINEERING, MANUFACTURING Additive manufacturing Pub Date : 2024-09-05 DOI:10.1016/j.addma.2024.104521

Honghao Xiang, Mingzhu Dang, Jikang Li, Zhenwu Zhang, Hairui Gao, Chao Cai, Qingsong Wei

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Abstract

In this study, Cu-11.1Al-8.15Mn-0.37Si shape memory alloy was manufactured via laser powder bed fusion (LPBF) and compared with furnace-cooling cast samples. The LPBF-manufactured samples exhibited a dual-phase structure of L2₁ austenite and 2H martensite, along with uniformly distributed nanoscale Mn₅Si₃ precipitations observed via TEM. The 2H martensite presented a layer-like morphology and was confirmed to be induced by residual stress during the LPBF process. Such a dual-phase structure could be stabilized by Mn₅Si₃ precipitations, and yielded the concurrent presence of prominent superelastic (SE) and shape memory effect (SME) properties. Under 6 % pre-strain, LPBF-manufactured samples showed an 80 % SE rate and 83 % SME rate. The recovery SE and SME strain could be up to 4.2 % and 2.1 %. Compared to the cast sample, fracture compressive and tensile strain increased by 68.4 % and 33.3 %. This enhancement was due to regularly arranged columnar crystals and strong [001]//Z texture confirmed by EBSD. These findings suggest that LPBF has the potential to produce Cu-Al-Mn-Si alloys with prominent shape memory properties and provide references for an austenite-martensite dual-phase structure.

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通过激光粉末床熔融技术实现具有突出形状记忆特性的双相结构铜-铝-锰-硅合金

本研究通过激光粉末床熔融（LPBF）制造了铜-11.1Al-8.15Mn-0.37Si形状记忆合金，并将其与炉冷铸造样品进行了比较。LPBF 制成的样品呈现出 L21 奥氏体和 2H 马氏体的双相结构，同时通过 TEM 观察到均匀分布的纳米级 Mn5Si3 沉淀。2H 马氏体呈现层状形态，经证实是由 LPBF 过程中的残余应力引起的。这种双相结构可通过 Mn5Si3 沉淀得到稳定，并同时具有突出的超弹性（SE）和形状记忆效应（SME）特性。在 6% 的预应变下，LPBF 制造的样品显示出 80% 的 SE 率和 83% 的 SME 率。恢复SE和SME应变可达4.2%和2.1%。与铸造样品相比，断裂压缩应变和拉伸应变分别增加了 68.4% 和 33.3%。这种提高是由于规则排列的柱状晶和强烈的[001]//Z 纹理（经 EBSD 证实）。这些研究结果表明，LPBF 具有生产形状记忆性能突出的铜-铝-锰-硅合金的潜力，并为奥氏体-马氏体双相结构提供了参考。

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来源期刊

Additive manufacturing Materials Science-General Materials Science

CiteScore

19.80

自引率

12.70%

发文量

648

审稿时长

35 days

期刊介绍： Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.