Emokpaire Stephen Okhiai, Wang Nan, Liu Jide, Zhu Chongwei, Wang Xinguang, Li Jinguo, Zhou Yizhou
Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China.
Materials (Basel). 2023 Mar 29;16(7):2732. doi: 10.3390/ma16072732.
In this work, the effect of the Ru element on the γ'-phase evolution and deformation mechanism in the fourth-generation Ni-based single-crystal superalloy was investigated. Results show that the Ru element alters the distribution coefficient of other elements in the alloy to produce reverse partitioning behavior, which leads to a difference in microstructure between 0Ru and 3Ru. The addition of Ru triggered the incubation period before the beginning of the primary creep stage, which depends on the creep temperature and stress during creep deformation. TEM results revealed that Ru addition inhibits the slip system {111}<112> at medium-temperature (760-1050 °C) and high-stress (270-810 MPa) creep, which brings a considerably low creep rate and high creep life to the Ru-containing alloy.
在本研究中，研究了Ru元素对第四代镍基单晶高温合金中γ'相演变及变形机制的影响。结果表明，Ru元素改变了合金中其他元素的分配系数，产生了反偏析行为，这导致了0Ru和3Ru之间微观结构的差异。Ru的添加引发了初始蠕变阶段开始前的孕育期，这取决于蠕变变形过程中的蠕变温度和应力。透射电镜结果表明，在中温（760 - 1050°C）和高应力（270 - 810 MPa）蠕变条件下，Ru的添加抑制了滑移系{111}<112>，这使得含Ru合金具有相当低的蠕变速率和高的蠕变寿命。
