论文部分内容阅读
研究了不同成分的Fe-Cu二元合金在过饱和固溶体状态下晶粒尺寸和硬度之间的关系,分析了Cu元素的固溶强化作用。研究了Fe-Cu二元合金的时效硬化现象和Cu元素的析出过程。结果表明Fe-Cu二元合金硬度值增加近一倍。通过透射电镜观察到随时效时间的增加,析出相的尺寸逐渐增大,形状由球形变为棒状。电子衍射花样分析得知,时效处理硬度达到最大值时对应的析出相具有B2型晶体结构,与基体之间保持平行位向关系。透射电镜观察到位错与析出相之间存在典型的引力型交互作用,由于软析出相对运动位错的钉扎效应而使Fe-Cu二元合金得到有效强化。
The relationship between the grain size and the hardness of the Fe-Cu binary alloys with different compositions in the supersaturated solid solution state was studied, and the solid solution strengthening effect of the Cu element was analyzed. The age hardening phenomenon and Cu element precipitation process of Fe-Cu binary alloy were studied. The results show that the hardness of Fe-Cu binary alloys nearly doubled. It was observed by TEM that with the increase of aging time, the size of the precipitated phase gradually increased and the shape changed from spherical to rod-shaped. Electronic diffraction pattern analysis shows that when the aging treatment reaches the maximum hardness, the corresponding precipitates have a B2-type crystal structure, and the substrate to maintain a parallel orientation relationship. Transmission electron microscopy showed that there was a typical gravitational interaction between dislocations and precipitates, and the Fe-Cu binary alloys were effectively strengthened due to pinning effect of relative motion dislocations.