Grain growth and microstructure evolution based mechanical property predicted by a modified Hall–Petch equation in hot worked Ni76Cr19AlTiCo alloy
Grain growth and microstructure evolution based mechanical property predicted by a modified Hall–Petch equation in hot worked Ni76Cr19AlTiCo alloy
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DOI：
10.1016/j.matdes.2013.10.023
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发表时间：
2014-03
影响因子：
8.4
通讯作者：
Y. Zhu;S. Z. Wang;B. L. Li;Z. Yin;Q. Wan;Peihai Liu
中科院分区：
文献类型：
--
作者：
Y. Zhu;S. Z. Wang;B. L. Li;Z. Yin;Q. Wan;Peihai Liu
研究了Ni76Cr19AlTiCo合金在800°C~1150°C压缩应变和0.001°S−1~1°S−1应变速率下的变形行为。当温度从850°C升高到950°C时，合金的力学性能发生了显著变化，并伴随着晶粒度的迅速增大。在950℃以上变形时发生回复和再结晶过程，再结晶程度随温度的升高或应变速率的降低而增加。结果表明，随着温度的升高或应变速率的降低，γ‘相在基体中析出，颗粒尺寸增大，析出相数目增多。同时也观察到了碳化铬的晶界析出，但由于析出物的数量很少，其影响可以忽略不计。提出了一个修正的Hall-Petch方程来预测合金的力学性能，该方程基于晶粒长大和组织演变。
The deformation behavior of Ni76Cr19AlTiCo has been investigated under compressive strains by up to 50% at temperatures ranging from 800 °C to 1150 °C, and at strain rates from 0.001 s−1to 1 s−1. A dramatic change in the mechanical properties of the alloy was observed when the temperature was increased from 850 °C to 950 °C, along with a rapid increase in grain size with increasing the temperature. Recovery and recrystallization processes occurred under deformation at temperatures above 950 °C. The degree of recrystallization was found to increase with increasing temperature or decreasing strain rate. γ′-phase precipitation occurred in the matrix and the particle sizes and the number of the precipitated phases were found to increase with increasing temperature or decreasing strain rate. Grain boundary precipitation of chromium carbides has also been observed, but its influence was negligible because of the small amount of the precipitates present in the matrix.A modified Hall–Petch equation was proposed to predict the mechanical properties of the alloy based on grain growth and microstructure evolution.