通过对两种不同Ru含量(0％和2％,质量分数)的新一代镍基单晶高温合金DD22铸态及热处理态组织定量表征与1100～ 1150 ℃持久性能测试,研究了Ru对相转变温度、(γ+γ')共晶组织、凝固偏析、合金元素相成分、合金元素分配比及持久性能的影响.结果表明:Ru降低了合金的固液相线、铸态共晶组织体积分数以及凝固偏析程度.合金热处理后,与无Ru合金相比,含Ru合金γ '尺寸更为细小,γ/γ'两相中对TCP相析出有重要影响的Re和Cr元素分配更加均匀.Ru通过降低γ'相尺寸,增加γ/γ'错配度,提高固溶强化效果,抑制持久加载过程中TCP相析出,显著提高DD22合金持久性能.
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