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材料研究学报  2009, Vol. 23 Issue (2): 127-132    
  研究论文 本期目录 | 过刊浏览 |
AlSi7MgBe合金的半固态挤压成形
赵大志1; 路贵民2; 崔建忠1
1.东北大学 材料电磁过程研究教育部重点实验室 沈阳110004
2.华东理工大学资源与环境工程学院 上海 200237
Semi–solid thixo-extrusion of AlSi7MgBe alloy
ZHAO Dazhi1;  LU Guimin2; CUI Jianzhong1
1.Key Lab of Electromagnetic Processing of Materials; Ministry of Education; Northeastern University; Shenyang 110004
2.School of Resources and Environmental Engineering; East China University of Science and Technology; Shanghai 200237
引用本文:

赵大志 路贵民 崔建忠. AlSi7MgBe合金的半固态挤压成形[J]. 材料研究学报, 2009, 23(2): 127-132.
, , . Semi–solid thixo-extrusion of AlSi7MgBe alloy[J]. Chin J Mater Res, 2009, 23(2): 127-132.

全文: PDF(1169 KB)  
摘要: 

对采用近液相线半连续铸造技术制备的AlSi7MgBe合金坯料进行半固态挤压成形, 通过组织与性能的分析, 研究了AlSi7MgBe合金的半固态挤压成形性. 结果表明: 用近液相线半连续铸造技术制备的AlSi7MgBe合金坯料具有均匀、细小的蔷薇状组织, 在575℃对其二次加热可获得稳定的、适合于半固态触变成形的球化组织, 进行半固态挤压成形可获得表面光洁, 组织细小、分布均匀的成形件, 在540℃固溶5 h然后175℃时效10 h处理, 其抗拉强度为325 MPa, 伸长率为14.6%, 表明具有良好的半固态挤压成形性.

关键词 材料合成与加工工艺AlSi7MgBe合金半固态挤压组织与性能    
Abstract

The semi–solid thixo–extruding feasibility of AlSi7MgBe alloy cast by near–liquidus semi–continuous casting (NLSC) process was studied by analyzing the microstructures and properties of extruded bars. The results shown that the microstructure of AlSi7MgBe alloy billets cast by NLSC consists mainly of the homogeneous, fine rosette–shaped grains. The microstructures of the billets, reheated and held at 575oC, are stable and near–spherical grains which are suitable for semi–solid thixoforming. The semi–solid thixoextruded bars of the AlSi7MgBe alloy billet are facial–smoothed, microstructure–fined and homogeneous. Treated by the solution at 540oC  for 5 hours and aging at 175oC for 10 hours, the tensile strength of the semi–solid extruded bars is above 325 MPa and the elongation rate is above 14.6%.

Key wordssynthesizing and processing technics    AlSi7MgBe alloy    semi–solid thixoextrusion    microstructure and properties
收稿日期: 2008-06-03     
ZTFLH: 

TG339

 
基金资助:

国家自然科学基金50874049资助项目.

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