SiCp增强铝基复合板材力学性能与晶粒取向分布

研究了粉末冶金法制备的ＳｉＣｐ增强铝基复合板材在热轧和冷思状态下的力学性能及板材中的晶粒取向分布，结果表明，热轧板材抗拉强度及塑性明显高于冷轧态，屈服强度则氏于冷轧态。冷轧板织构主要包含微弱的剪切织构｛００１｝〈１１０〉和两个常的面心立方金属织构组分｛１１０｝〈１１２〉及｛３３１４｝〈７７３〉；而热轧板织构近乎无规分析，晶粒取向的择优对复合板材的屈服强度有一定影响，与抗拉强度无关。冷轧板抗拉强度的

MECHANICAL PROPERTIES AND CRYSTALLITE ORIENTATION DISTRIBUTION OF SiC_p REINFORCED ALUMINIUM MATRIX COMPOSITE SHEETS

The mechanical properties of an aluminium alloy sheet (Al-3.OCu-1.5Mg-0.4Mn)reinforced by 15% silicon carbide particulate via powder metallurgy technique were investigated under hot-and cold-rolling conditions,and the crystallite orientation distribution in these sheets were also determined by ODF analysis.The hot-rolled sheet composite exhibits much higher ultimate tensile strength and elongation comparing to those of the cold-rolled one. However, the cold-rolled sheet has an elevated 0.2% yield strength.The texture of the cold-rolled sheet composite consists of three weak components, i.e. shear component {001}<110> and two other typical fcc components {110}<112> and {3 3 14}<773>, while the hot rolling texture is almost random. The textured microstructure has an effect on the 0.2% yield strength and do not have any influence on the ultimate tensile strength.The decrease in ultimate tensile strength of the cold-rolled sheet is attributed mainly to the micro-damages produced during cold rolling.