铸造技术2026，Vol.47Issue(5)：498-509,12.DOI:10.16410/j.issn1000-8365.2026.6037
粉末热挤出Al-Mn-Mg-Sc-Zr合金的高温拉伸性能及多尺度析出相演化机制
High-Temperature Tensile Properties and Multiscale Precipitate Evolution Mechanisms of a Powder Hot-Extruded Al-Mn-Mg-Sc-Zr Alloy
摘要
Abstract
Al-Mn-Mg-Sc-Zr alloys were fabricated by gas atomization,cold isostatic pressing,and hot extrusion,and their high-temperature tensile properties and multiscale precipitate evolution from room temperature to 300℃ were investigated.The as-extruded alloy has a fine equiaxed grain structure with micron-sized Al6Mn particles and nanoscale Al3(Sc,Zr)precipitates dispersed in the matrix,whereas discontinuously distributed MgO particles are present along the grain boundaries.At room temperature,the strength of the alloy is high,with an ultimate tensile strength of 460.3 MPa and a yield strength of 422.8 MPa,but the elongation is limited to 3.9％.At 200℃,a favourable strength-ductility balance is obtained,with an ultimate tensile strength of 219.8 MPa,a yield strength of 200.2 MPa,and an elongation of 23.8％.Microstructural analysis indicates that the Al6Mn phase coarsens significantly at elevated temperatures,leading to a weakened strengthening effect.In contrast,the nanoscale Al3(Sc,Zr)precipitates with an ordered L12 structure maintain coherent interfaces with the α-Al matrix and exhibit excellent thermal stability because of the sluggish diffusion of Sc and Zr,thereby continuously contributing to strengthening.Moreover,a small amount of discontinuously distributed MgO particles is present at the grain boundaries.The elevated-temperature tensile behavior of the alloy is governed primarily by the distinct thermal stability of multiscale precipitates.关键词
Al-Mn-Mg-Sc-Zr合金/粉末热挤出/高温拉伸/多尺度析出相/强化机制Key words
Al-Mn-Mg-Sc-Zr alloy/powder hot extrusion/high-temperature tensile properties/multiscale precipitates/strengthening mechanism分类
矿业与冶金引用本文复制引用
王蕊,范文新,莫畏,李树奎,余鹏,叶曙龙..粉末热挤出Al-Mn-Mg-Sc-Zr合金的高温拉伸性能及多尺度析出相演化机制[J].铸造技术,2026,47(5):498-509,12.基金项目
深圳市重点产业研发计划(ZDCY20250901101204005) （ZDCY20250901101204005）
广东省普通高校重点领域专项(2024ZDZX3016) （2024ZDZX3016）
