以4种不同Ni含量(15％～45％,原子分数)的新型γ'相强化Co-Al-W基合金为研究对象,通过时效与高温热处理显微组织分析以及显微硬度测试,研究了Ni对相转变温度、γ/γ'两相组织演变、γ'相高温溶解行为和显微硬度的影响.结果表明:随着Ni含量的增加,γ'相溶解温度升高,固相线温度未发生明显变化.4种合金经900℃,50 h热处理后,基体均为γ/γ'两相组织;随着Ni含量的增加,γ'相形貌由立方形逐渐向近似球形转变,γ'相体积分数不断降低.经300 h长时间热处理后,合金的γ'相形貌没有明显改变,γ'相体积分数出现不同程度的降低.对900℃,300 h热处理的合金进行970～1060℃高温处理后,γ'相体积分数随着热处理温度的升高而逐渐减少,并最终全部溶解而消失;低Ni含量(15％和25％)合金和高Ni含量(35％和45％)合金的γ'相形貌分别转变为球形和立方形.900℃,50h和300h显微硬度测试结果表明:随着Ni含量的增加,合金的硬度降低;热处理时间的延长使合金的硬度小幅增加.
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