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Elimination of extraordinarily high cracking susceptibility of aluminum alloy fabricated by laser powder bed fusion
Journal of Materials Science & Technology ( IF 11.2 ) Pub Date : 2021-08-26 , DOI: 10.1016/j.jmst.2021.06.023
Holden Hyer 1, 2 , Le Zhou 1, 3 , Sharon Park 1, 4 , Thinh Huynh 1 , Abhishek Mehta 1 , Saket Thapliyal 5 , Rajiv S. Mishra 5 , Yongho Sohn 1
Affiliation  

Using the calculation of phase diagrams approach and Scheil solidification modeling, the Al-2.5Mg-1.0Ni-0.4Sc-0.1Zr alloy was designed, intentionally with an extraordinarily high cracking susceptibility, making it prime for solidification cracking during laser powder bed fusion. This study demonstrates the ability to mitigate even the most extreme solidification cracking tendencies in aluminum alloys with only minor alloying additions of Sc and Zr, 0.5 wt.% max. Furthermore, by employing a simple direct ageing heat treatment, good tensile mechanical properties were observed with a yield strength of 308 MPa, an ultimate tensile strength of 390 MPa, and a total elongation of 11%.



中文翻译:

消除激光粉末床熔合铝合金超高裂纹敏感性

使用相图计算方法和 Scheil 凝固模型,Al-2.5Mg-1.0Ni-0.4Sc-0.1Zr 合金被设计为具有极高的开裂敏感性,使其成为激光粉末床熔融过程中凝固开裂的主要材料。该研究表明,即使仅添加少量 Sc 和 Zr(最大 0.5 wt.%)合金元素,也能减轻铝合金中最极端的凝固开裂趋势。此外,通过采用简单的直接时效热处理,观察到良好的拉伸力学性能,屈服强度为 308 MPa,极限拉伸强度为 390 MPa,总伸长率为 11%。

更新日期:2021-09-15
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