在直接时效IN718(简称DA718)合金中单独添加磷至0.022%(质量分数,下同)及添加磷至0.022%和硼至0.011%,合金的持久性能都得到了大幅度的提高.其中在650℃/700 MPa,两种成分合金的持久寿命分别提高至200%和280%,但后者的塑性有所下降磷、硼对蠕变实验中的应力指数影响不大,但显著提高表观蠕变激活能对磷、硼在DA718合金中的作用进行了讨论.
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