Effect of ruthenium on the precipitation of topologically close packed phases in Ni-based superalloys of 3rd and 4th generation
Effect of ruthenium on the precipitation of topologically close packed phases in Ni-based superalloys of 3rd and 4th generation
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DOI：
10.1016/j.actamat.2015.05.033
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发表时间：
2015-08-15
期刊：
影响因子：
9.4
通讯作者：
Singer, R. F.
中科院分区：
文献类型：
--
作者：
Matuszewski, K.;Rettig, R.;Singer, R. F.
拓扑密排相的析出对高耐热镍基高温合金的高温强度有不利影响。Ru对这种所谓的不稳定性的有益影响现在被广泛接受。在本文件中的拓扑紧密堆积（TCP）相的沉淀定量研究在两个实验合金（一个Ru自由和一个添加Ru），以澄清Ru效应的机制。结果表明，TCP相的析出是先析出四方相的连续相变过程。Ru阻碍了相转变，降低了TCP相的平衡体积分数。结果清楚地表明，Ru降低了TCP相沉淀的驱动力。TCP/基质界面的晶体学和化学的调查点的失配应变能的增加的额外的效果。(C)2015 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The precipitation of topologically close packed (TCP) phases is detrimental for the high temperature strength of high refractory Ni-based superalloys. The beneficial influence of Ru with respect to this so called instability is nowadays well accepted. In the present paper the precipitation of topologically close packed (TCP) phases is studied quantitatively in two experimental alloys (one Ru-free and one with addition of Ru) to clarify the mechanism of the Ru effect. It is confirmed that the TCP phase precipitates undergo sequential phase transformation with the tetragonal sigma-phase precipitating first. Ru retards the phase transformation and leads to decreased equilibrium volume fraction of TCP phases. The results clearly indicate that Ru decreases the driving force for TCP phase precipitation. Investigations of crystallography and chemistry of the TCP/matrix interface point to an additional effect by increase of misfit strain energy. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.