采用光学显微镜、扫描电镜和能谱仪等研究了2618-Ti铝合金制备过程中的显微组织演变和硬度变化.结果表明,2618-Ti铝合金铸态组织主要由等轴状α(Al)相、晶间低熔点共晶组织、分布于晶内和晶界的针状Al9FeNi相和存在于晶内的细小Al3Ti相组成.均匀化处理后,在Al3Ti相周围形成了Al18Mg3Ti2相,合金的晶粒组织明显长大.热轧变形后,Al9FeNi相得到碎化,呈现为明显的变形组织特征.冷轧后的晶粒组织沿轧制方向伸长,Al9FeNi相得到了明显的碎化,Al3Ti相得到了一定程度的破碎.固溶处理后,2618-Ti铝合金晶粒组织变为近似等轴晶,其平均尺寸有所增大.时效处理后,2618-Ti铝合金的晶粒组织没有变化.不同加工状态的2618-Ti铝合金具有不同的硬度值,但该合金时效后的硬度明显低于2168铝合金时效后的硬度值.
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