热加工工艺对喷射沉积SiC_p/Al-Fe-V-Si组织与性能的影响  

Effects of Hot Working on the Microstructure and Mechanical Properties of Spray-deposited SiC_P/Al-Fe-V-Si Composites

作　　者：徐政坤[1] 贺毅强[2] 卢端敏[2] 王娜[2] 乔斌[2] 

机构地区：[1]张家界航空工业职业技术学院 [2]淮海工学院机械工程学院

出　　处：《特种铸造及有色合金》2009年第8期741-744,共4页Special Casting & Nonferrous Alloys

基　　金：湖南省教育厅自然科学研究资助项目(08D127)

摘　　要：研究了多层喷射沉积SiCp/Al-8.5Fe-1.3V-1.7Si复合材料的挤压后轧制和热压后轧制两种热加工工艺,对比研究了这两种工艺对于复合材料板材的显微组织和力学性能的影响。通过金相电镜、扫描电镜、透射电镜观察了复合材料通过不同工艺加工后的显微组织。结果表明,热压后再轧制比挤压后再轧制,复合材料具有更加均匀的显微组织,其力学性能更加优异,热压后轧制得到的板材室温抗拉强度达620MPa,伸长率达9.5%。分析认为,热压致密能克服挤压过程中带来的SiC颗粒分层现象,SiC颗粒与基体结合良好保证了显微组织的均匀和细小,因而加工得到的板材具有优异的力学性能。Effects of rolling-after-extrusion and rolling-after-hot pressing on microstructure and mechanical properties of mullti-layer spray-deposited SiCP/Al-Fe-V-Si composites were comparatively analyzed by OM (optical microscope),SEM(scanning electron microscope) and TEM (transmission electron microscope). The results indicate that,compared with rolling-after-extrusion ones,the rolling-after-hot pressing composites exhibit more uniform microstructure and more excellent mechanical properties. Ambient tensile strength and elongation of the sheet produced by rolling-after-hot pressing reach 620MPa and 9%,respectively. SiC particle lamination during extrusion can be eliminated by hot pressing densification to ensure the uniform and fine distribution of microstructure due to the desirable bonding between SiC particle and matrix alloy,which is responsible for the excellent mechanical properties of the composites sheet.

关 键 词：耐热合金 复合材料 喷射沉积 热加工 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]