文献类型：期刊文献

英文题名：The effect of Mn content on a novel Al-Mg-Si-Sc-Zr alloy produced by laser powder bed fusion: The microstructure and mechanical behavior

作者：Zhao, Junhao[1];Luo, Liangshun[2];Zheng, Xiaonan[3];Zhang, Tao[1];Luo, Hao[1];Li, Zun[1];Liu, Tong[2];Wang, Liang[2];Su, Yanqing[2]

第一作者：赵继红

通讯作者：Zhao, JH[1]

机构：[1]Xinxiang Univ, Sch 3D printing, Xinxiang 453000, Peoples R China;[2]Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China;[3]Henan Inst Sci & Technol, Sch Chem & Chem Engn, Xinxiang 453000, Peoples R China

第一机构：新乡学院

通讯机构：[1]corresponding author), Xinxiang Univ, Sch 3D printing, Xinxiang 453000, Peoples R China.|[11071]新乡学院;

年份：2024

卷号：28

起止页码：989-1001

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：;EI(收录号：20235115232062);Scopus(收录号：2-s2.0-85179619820);WOS:【SCI-EXPANDED(收录号:WOS:001141065200001)】；

基金：This work was supported by National Natural Science Foundation of China 51671073, 52001001, 51425402 and Major Special Science and Technology Project of Yunnan Province 202002AB080001-3.

语种：英文

外文关键词：Additive manufacturing; Laser powder bed fusion; Aluminium; Alloy development; Manganese

摘要：Scandium is very expensive and limits the application potential of Sc containing alloys. A novel high-strength Al-Mg-Mn-Sc-Zr alloy was designed for reducing Sc. Multiple strengthening mechanisms were utilized for designing this alloy, especially for the solid solution strengthening which benefits from ultrahigh cooling. With the addition of Mn and Si, the strength of our alloy reaches comparable level of similar alloys while the Sc content is 40-60 % less than them. The effect of Mn addition on microstructure and mechanical properties were carefully studied. Near full-dense samples with relative density >99.88 % were obtained with the help of overlapping prediction model. The continuous Mg2Si network was observed with Si introduction and broken up with increasing Mn content. According to the tensile experiment results and corresponding calculations, it was considered that the thermal stability and the effect of precipitate strengthening was slightly deteriorated. However, obvious improvement of the tensile strength was observed with increasing Mn addition, and the ductility maintains in a certain range. After aging at 280 degrees C for 4 h, the sample of 1.4 wt% Mn exhibits the highest ultimate strength of 497.08 +/- 7.22 MPa, and possesses a considerable ductility of 8.01 +/- 0.34 %. The Portevin-Le Chatelier (PLC) effect was observed in stress-strain curves, which reflects a dynamic strain aging of mobile dislocations and solute atoms. After aging, the stress amplitude and waiting time of serration flow decrease obviously, because of the introduction of bypassing precipitates and reduction of diffusion time. Compared with other similar alloys, our alloy exhibited comparable yield strength and elongation, but considerable advantages in material costs resulting from lower Sc content. It will offer not only an idea for alloy design utilizing the ultra-high solid solubility of elements, but also a feasible way to further expand application field of high-strength Al-based alloys through reducing the material costs.