高性能钛/铝复合板的关键制备技术

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目的 研究TA2纯钛/6061铝合金复合界面的微观组织和力学性能,以及热处理对复合板组织和力学性能的影响.方法 在1×10-2 Pa高真空度下,对钛/铝复合坯进行搅拌摩擦焊封装,并在轧制温度为426℃和总压下率为80%下进行热轧复合;然后,对复合板进行T6热处理,即在540℃固溶及177℃时效5 h.随后,对热处理前后的复合界面进行扫描电镜和电子探针分析,明确元素扩散机制,并对复合板进行拉剪性能测试.结果 热轧后复合板的界面平直,无气孔、裂纹等缺陷,界面剪切强度为94.2 MPa.热处理后复合板铝基体力学性能提高,界面剪切强度达141.2 MPa.结论 采用真空轧制复合技术制备出了板形好、无缺陷的钛/铝复合板,经T6热处理后,钛/铝复合板的界面结合性能大幅改善,提高约50%.
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