The effect of second-phase Ni solid solution on environmental embrittlement of L12-type Ni3(Si,Ti) ordered alloys
The effect of second-phase Ni solid solution on environmental embrittlement of L12-type Ni3(Si,Ti) ordered alloys
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第二相Ni固溶体对L12型Ni3(Si,Ti)有序合金环境脆性的影响
DOI：
10.1016/j.msea.2004.06.046
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发表时间：
2004
期刊：
影响因子：
6.4
通讯作者：
T. Takasugi
中科院分区：
文献类型：
--
作者：
T. Nakamura;Y. Kaneno;H. Inoue;T. Takasugi
通过拉伸试验、断口形貌观察和显微组织观察，研究了L12型Ni 3（Si，Ti）合金的环境脆化，考察了第二相Ni固溶体的形态、体积分数、尺寸和界面结构对环境脆化的影响。对于Ni80.5Si10.5Ti9（以at.%表示）当合金中含有细小的Ni固溶体析出于L12基体中，并含有高体积分数的由Ni固溶体和L12相组成的类共析组织时，在所有时效条件下都很少发生环境脆化。对于在L12基体中含有细小的Ni固溶体沉淀物和体积分数非常小的类共晶组织的Ni 80 Si 10.7 Ti 9.3合金，随着时效时间的增加，环境脆化降低，即，随着Ni固溶体析出物的粗化，并最终在延长的时效时间内被完全抑制。对于在L12基体中仅含有细小Ni固溶体析出物的Ni79.7Si10.9Ti9.4合金，随着时效时间的延长，环境脆化仅略有降低。这些结果进行了讨论，与氢的相互作用与第二相Ni固溶体中的类共析组织以及在L12矩阵晶粒。
The environmental embrittlement of the L12-type Ni3(Si,Ti) alloys was studied in terms of the effect of morphology, volume fraction, size and interfacial structure of a second-phase Ni solid solution by a tensile test, fractographic and microstructural observation. For the Ni80.5Si10.5Ti9(expressed by at.%) alloy that contained fine Ni solid solution precipitates in the L12matrix and a high volume fraction of the eutectoid-like microstructure consisting of Ni solid solution and L12phase, environmental embrittlement rarely occurred under all aging conditions. For the Ni80Si10.7Ti9.3alloy that contained fine Ni solid solution precipitates in the L12matrix and a very small volume fraction of the eutectoid-like microstructure, environmental embrittlement was reduced with increasing aging time, i.e., with the coarsening of the Ni solid solution precipitates, and was eventually fully suppressed in a prolonged aging time. For the Ni79.7Si10.9Ti9.4alloy that contained only fine Ni solid solution precipitates in the L12matrix, environmental embrittlement was only slightly reduced with increasing aging time. These results were discussed in association with the interaction of hydrogen with the second-phase Ni solid solution in a eutectoid-like microstructure as well as in L12matrix grains.