High-temperature tensile behaviors of an ultra-strong aluminum alloy fabricated by additive manufacturing

IF 4.2 Q2 ENGINEERING, MANUFACTURING Additive manufacturing letters Pub Date : 2024-08-17 DOI:10.1016/j.addlet.2024.100234

Anyu Shang, Benjamin Stegman, Xuanyu Sheng, Ke Xu, Yifan Zhang, Chao Shen, Emiliano Flores, Tanner McElroy, Haiyan Wang, Xinghang Zhang

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Abstract

Additively manufactured (AM) Al alloys have widespread applications. Their high-temperature mechanical behaviors are also of significant interest. In this study, we investigated the microstructure and mechanical behavior of Al-2Ti-2Fe-2Co-2Ni (at%) alloy processed by laser powder bed fusion. The as-printed alloy contains a distinctive heterogeneous microstructure characterized by nanoscale intermetallic lamellae arranged in rosette patterns in the Al matrix. Notably, this alloy exhibits high tensile strength and thermal stability up to 500 °C as revealed by in-situ tension studies in a scanning electron microscope. The enhanced high temperature performance can be attributed to a substantial volume fraction of well-dispersed, nanoscale stable intermetallic particles.

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增材制造超强铝合金的高温拉伸行为

快速成型（AM）铝合金应用广泛。它们的高温力学行为也备受关注。在本研究中，我们研究了通过激光粉末床熔融技术加工的 Al-2Ti-2Fe-2Co-2Ni (at%) 合金的微观结构和力学行为。打印后的合金含有一种独特的异质微观结构，其特征是铝基体中排列成莲座状的纳米级金属间薄片。值得注意的是，通过扫描电子显微镜进行的原位拉伸研究显示，这种合金具有很高的拉伸强度和热稳定性，温度可达 500 ℃。高温性能的增强可归功于大量分散良好的纳米级稳定金属间化合物颗粒。

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