【摘 要】
：
研究了时效前的预拉伸变形量对喷射成形2195铝锂合金时效析出行为及力学性能的影响规律.结果表明:2195合金经固溶处理后直接时效,组织以 δ′(Al3Li)相+少量T1(Al2CuLi)相为主,晶界处分布着大量断续分布的颗粒析出相组织(富AlCu相及AlCuFe相).时效前的预拉伸变形在合金基体中引入的大量位错成为T1相、θ′相的有效形核点,显著促进T1相和θ′相晶内均匀、细小弥散析出,并降低晶界无析出带宽度,形成以T1、δ′相、θ′相为主的混合析出相组织.力学性能测试结果表明:当热处理工艺为(510℃,
【机 构】
：
中国航空制造技术研究院 材料应用研究部,北京 100024;清华大学 材料学院,北京 100084;北京航空航天大学 材料科学与工程学院,北京 100083
论文部分内容阅读
研究了时效前的预拉伸变形量对喷射成形2195铝锂合金时效析出行为及力学性能的影响规律.结果表明:2195合金经固溶处理后直接时效,组织以 δ′(Al3Li)相+少量T1(Al2CuLi)相为主,晶界处分布着大量断续分布的颗粒析出相组织(富AlCu相及AlCuFe相).时效前的预拉伸变形在合金基体中引入的大量位错成为T1相、θ′相的有效形核点,显著促进T1相和θ′相晶内均匀、细小弥散析出,并降低晶界无析出带宽度,形成以T1、δ′相、θ′相为主的混合析出相组织.力学性能测试结果表明:当热处理工艺为(510℃,2 h)固溶处理+3％预拉伸+(155℃,24 h)时效处理,喷射成形2195铝锂合金室温抗拉强度约为(663±1)MPa,屈服强度约为(647±1)MPa,伸长率为(10.4±0.6)％,能够获得良好的强韧性匹配.
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