期刊
MATERIALS & DESIGN
卷 99, 期 -, 页码 182-192出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.03.068
关键词
Aluminum matrix composite; Powder thixoforming; Solution treatment; Mechanical property; Micromechanical modeling
资金
- Basic Scientific Fund of Gansu Universities [G2014-07]
- Program for New Century Excellent Talents in University of China [NCET-10-0023]
- Program for Hongliu Outstanding Talents of Lanzhou University of Technology [2012-03]
6061 Al-based composites reinforced with 10% volume fractions of 6.94 mu m SiC particles (SiCp) have been fabricated by powder thixoforming, and the effects of solution treatment on their tensile properties and strengthening mechanisms were investigated. The obtained results indicate that the addition of SiCp significantly improved the tensile strength of a 6061 Al matrix alloy, but reduced its ductility. The ultimate tensile and yield strengths of the alloy increased from 180 MPa and 99 MPa to 230 MPa and 128 MPa, respectively, while its elongation decreased from 8.0% to 2.6%. However, the solution treatment at 535 degrees C for 6 h significantly alleviated ductility losses and further enhanced the composite tensile strength; as a result, its ultimate tensile strength, yield strength, and elongation were increased by 19.6%, 65.2%, and 161.5% up to 275 MPa, 212 MPa, and 6.8%, respectively. Due to the presence of SiCp, the resulting composite solution rate was noticeably decreased compared to that of the matrix alloy. The relationship between the solution time and the composite yield strength was discussed theoretically by using a modified micromechanical model, which took into account the SiCp failure. The obtained theoretical results were in good agreement with the experimental ones. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据