【摘要】 研究了由喷射共沉积法制备的１５ｖｏｌ％ＳｉＣｐ／ＬＹ１２复合材料在强电场中进行超塑性变形时的最佳温度—速度—场强条件。结果表明，在最佳的工艺参数（７７３Ｋ－３．３×１０－４ｓ－１－２ｋＶ／ｃｍ）条件下，１５ｖｏｌ％ＳｉＣｐ／ＬＹ１２复合材料超塑性变形时的最大延伸率为４２０％。方差分析结果证实了场强（Ｅ）是在强电场中超塑性变形时的一个重要工艺参数。更多还原

【Abstract】 The application of a strong electric field to the process of superplastic deformation is a relatively new development of metal forming. However, to the authors′ best knowledge, superplastic deformation of metal matrix composites under an electric field has not yet been reported. In this paper, superplastic deformation of 15vol%SiCp/LY12 Al composite under a strong electric field has first been investigated. The material of an aluminum alloy, LY12(corresponding approximately to ASTM 2024), containing 15vol% SiC particles, was fabricated by spray atomization and codeposition and pretreated by isothermal hot compression and isothermal hot forward extrusion(extrusion ratio:10.0). Moreover, how to choose optimum process parameters during superplastic deformation of 15vol%SiCp/LY12 Al composite has been studied. The authors find that strong electric field can improve the ultimate elongation at fracture for superplastic uniaxial tension of metal matrix composite. Such an improvement can be obtained for the superplastic deformation of 15vol%SiCp/LY12 Al composite when the following optimum process parameters are chosen: 773 K for deformation temperature, 2.0 kV/cm for intensity of electric field, and 3.3×10 -4 s -1 for initial strain rate. For 15vol%SiCp/LY12 Al composite, the ultimate elongation with electric field reached 420%, increased by 20% as compared with that without electric field.更多还原