γ '颗粒粗化对低铝钛镍基高温合金临界分解剪切应力的影响
Impact of gamma' particle coarsening on the critical resolved shear stress of nickel-base superalloys with low aluminium and/or titanium content
摘要：
在具有低Al和/或Ti含量的Ni基高温合金中，在中间温度下γ '颗粒的沉淀和随后的粗化有助于合金的机械性能的劣化。本文通过对单个滑移刃型位错脱钉过程的统计分析，模拟了粗化过程，并计算了γ '粒子粗化引起的合金临界分辨剪应力的变化。发现γ硬化对973 K临界分解剪应力的贡献在不到一年的时间内减少到原来的一半以上。
英文摘要：
In Ni-base superalloys with low Al and/or Ti content the precipitation and subsequent coarsening of gamma' particles at intermediate temperatures contribute to the degradation of the mechanical properties of the alloy. In the present paper the coarsening process is modelled and the change of the critical resolved shear stress of the alloy due to coarsening of the gamma' particles is calculated by means of statistical analysis of the depinning of a single gliding edge dislocation. It is found that the contribution of gamma' hardening to the critical resolved shear stress at 973 K reduces to more than half of its original value in less than one year.
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