中南大学学报（自然科学版）2017，Vol.48Issue(10)：2665-2671,7.DOI:10.11817/j.issn.1672-7207.2017.10.015
超声振动工艺下微量Sc对A380合金组织性能的影响
Effect of minor Sc under ultrasonic vibration technology on microstructures and mechanical properties of A380 alloy
摘要
Abstract
Effects of 0-0.5% Sc under ultrasonic vibration technology (UVT) modification on microstructure and mechanical properties of A380 alloy were investigated.The results show that the primary α phase in A380 alloy can be refined significantly, which makes coarse dendrite into fine non-directional dendrites,and a number of α phase in form of rosette and granular can be observed.The desirable refinement of α phase in A380 alloy is obtained with 0.3% Sc. Meanwhile, the sizes of eutectic silicon and Al3FeSi2 phase in the alloy decrease significantly by adding minor Sc under UVT, and the shapes of the eutectic silicon and Al3FeSi2 phase change from coarse acicular to vermicular and spot ones. The as-cast A380 with 0.3% Sc has tensile strength of 314 MPa, yielding strength of 223 MPa, elongation of 3.7% and hardness of 109. The grain size is the smallest (31 μm),and shape factor is the largest (0.75).关键词
Sc/超声波振动/微观组织Key words
scandium/ultrasonic vibration/microstructures分类
矿业与冶金引用本文复制引用
雷吉平,余剑武,李承波,陈健美,范光辉,李子夫..超声振动工艺下微量Sc对A380合金组织性能的影响[J].中南大学学报（自然科学版）,2017,48(10):2665-2671,7.基金项目
国家自然科学基金资助项目(51275165) （51275165）
湖南省"十二五"重点建设学科资助项目(080204)(Project(51275165) supported by the National Natural Science Foundation of China （080204）
Project(080204) supported by Key Construction Projects of Hunan Province During 12th Five-Year) （080204）
