Thermomechanical response of an ultrafine-grained nickel-yttrium alloy
Thermomechanical response of an ultrafine-grained nickel-yttrium alloy
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DOI：
10.1016/j.scriptamat.2020.06.068
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发表时间：
2020-10
影响因子：
6
通讯作者：
S. Srinivasan;C. Kale;B. Hornbuckle;K. Darling;Pedro Peralta;K. Solanki
中科院分区：
文献类型：
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作者：
S. Srinivasan;C. Kale;B. Hornbuckle;K. Darling;Pedro Peralta;K. Solanki
通过单轴压缩下的准静态 (10−4s−1) 和高温蠕变实验以及变形后透射电子显微镜 (TEM) 表征，研究了超细晶粒镍钇合金的热机械行为。虽然该合金在室温下具有约 1255 MPa 的准静态流变应力，但在 873 K 时流变应力下降了约 80%。TEM 分析显示，在整个测试温度范围内，平均晶粒生长可以忽略不计。此外，由于晶粒尺寸的相对稳定性以及位错/晶界和夹杂物/弥散体之间的相互作用，该合金表现出优异的稳态蠕变行为。
Thermomechanical behavior of an ultrafine-grained nickel-yttrium alloy has been investigated through quasi-static (10−4s−1) and high temperature creep experiments under uniaxial compression along with post-deformed transmission electron microscopy (TEM) characterization. While the alloy possesses a quasi-static flow stress of ~1255 MPa at room temperature, the flow stress drops by about 80% at 873 K. TEM analysis showed negligible average grain growth over the entire temperature range tested. Furthermore, the alloy showed exceptional steady–state creep behavior owing to the relative stability of the grain size and interactions between dislocations/grain boundary and inclusions/dispersoids.