江苏大学学报（自然科学版）2018，Vol.39Issue(2)：211-216,248,7.DOI:10.3969/j.issn.1671-7775.2018.02.015
超声振动下Sr对A380合金组织性能的影响
Effects of Sr and ultrasonic vibration on microstructures and mechanical properties of as-cast A380 alloy
摘要
Abstract
The effects of 0~0.25%Sr and ultrasonic vibration(UV)on microstructure and mechanical properties of A380 alloy were investigated.The results show that the microstructure in A380 alloy can be refined significantly,and the α-Al phase are changed from coarse dendrite into fine non-directional dendrites with globular structure,while the eutectic Si phase are changed from coarse acicular into ver-micular,spot ones and fibrous.The desirable refinement of the microstructure in A380 alloy is obtained with 0.15% Sr.Tensile strength,yield strength,elongation and hardness of the as-cast A380 with 0.15% Sr addition are 305 MPa,219 MPa,3.78%and 106 BHN,and those are respective 318 MPa, 227 MPa,3.99% and 108 BHN under 0.15% Sr addition with UV.The smallest grain size is 42 μm, and the largest shape factor is 0.71 with 0.15% Sr addition under UV.关键词
A380合金/Sr变质/超声振动/力学性能/共晶SiKey words
A380 alloy/Sr modification/ultrasonic vibration/mechanical property/eutectic Si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,罗红..超声振动下Sr对A380合金组织性能的影响[J].江苏大学学报（自然科学版）,2018,39(2):211-216,248,7.基金项目
国家自然科学基金资助项目(51275165) （51275165）
长沙市科技计划重点项目(kh1701182) （kh1701182）
湖南省"十二五"重点建设学科项目(080204) （080204）
