Morphological Evolution of Fe-Rich Phases in the AlSi9Cu3Mg0.19(Fe) Alloy with the Addition of Minor Mn and Cr

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2018,（6）
• 页码范围: 629-640
• 页数: 12页
• 语种: 英文

摘要

The morphological evolution of Fe-rich phases in the AlSi9Cu3Mg0. 19(Fe) alloy has been investigated with various contents of Fe, Mn, and Cr. The results show that coarse Chinese script Fe-rich phases appear in the alloy with 0. 6 wt％ Fe combined with trace Mn, while the blocky Fe-rich phases appear combined with trace Cr. Under the coexistence of trace Mn and Cr, a large number of fine Chinese script Fe-rich phases could be visible in the low iron-bearing AlSi9Cu3-Mg0. 19(Fe) alloy (0. 60 wt％). At high Fe level (1. 30 wt％), numerous Fe-rich phases with hexagonal morphologies are observed with the trace Cr, while fish-bone and pentagonal morphologies of Fe-rich phases could be simultaneously observed with the addition of both Mn and Cr. The results reveal that the trace Mn and Cr promote the morphological evolution of Fe-rich phases. The morphology evolution mechanism of Fe-rich phases has been discussed by using the atom radius and electronegativity differences of Fe, Mn, and Cr.