粉末半固态触变挤压SiC_p/2024复合材料的组织与性能  

Microstructures and Mechanical Properties of SiC_p/2024 Matrix Composites Prepared by Powder Semi-solid Thixoextruding Forming

作　　者：刘振华[1,2] 阎峰云[1,2] 贺小祥[1,2] 李先 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室 [2]有色金属合金及加工教育部重点实验室

出　　处：《特种铸造及有色合金》2015年第6期622-625,共4页Special Casting & Nonferrous Alloys

摘　　要：采用粉末半固态触变挤压工艺制备SiC含量为5%、10%和15%的2024铝基复合材料棒材,研究了真空烧结工艺和SiC颗粒含量对复合材料组织及性能的影响。结果表明,孔洞的存在对复合材料性能影响较大。经过真空处理的复合材料孔隙率比未经处理的减小65.3%,抗拉强度提高了9.7%。随着SiC含量的提高,复合材料的强度、硬度增加,塑性降低,SiC含量为15%的复合材料抗拉强度相比SiC含量为5%的复合材料提高了14.1%,伸长率则降低了51.9%,而且随着SiC含量的增加,脆性断裂趋势更加明显。SiCp/2024 composite bars with SiC particle volume fraction oi 5%, 10%, 15%, respecuveiy, were prepared by powder mixing and semi-solid thixoextruding forming technology. Influenees of vacu- um treatment process and SiC particle volume fraction on mierostrueture and properties of the compos- ites prepared were investigated. The result indicates that porosity rate is decreased approximately 65. 3% in the composites prepared by vacuum treatment than that one without vacuum treatment, and the tensile strength is increased by 9.7 %. With increasing in SiC particles volume fraction, tensile strength and hardness of the composites are increased, while the plasticity is decreased. The composites with 15% SiCp are increased by 14.1% in tensile strength and decreased by 51.9% in elongation , compared with those of the composites with 5 % SiCp. And with the increase of SiC volume fraction, brittle frac- ture exhibits more obvious.

关 键 词：半固态触变成形 SICP/2024复合材料 显微组织 力学性能 

分 类 号：TB33[一般工业技术—材料科学与工程]