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Cu-Cr-Zr合金时效析出相的研究 总被引:2,自引:0,他引:2
利用高分辨电子显微镜(HRTEM)及系列欠焦像出射波函数重构技术,探明了在大气环境下,Cu-Cr-Zr合金峰值时效时存在氧化物析出相。研究结果表明:Cu-Cr-Zr合金经950℃×1.5 h固溶处理、450℃时效6 h硬度达峰值;此时样品中除早期的具有花瓣状应变场衬度的共格析出相外,另一类强化相为圆盘状形貌的CuCrO2;该氧化物析出相为三方晶系,空间群为R 3 m(166),与基体具有特定取向关系:[011]Cu//[010]CuCrO2,(111)Cu//(003)CuCrO2,惯习面为{111}Cu。 相似文献
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In-situ straining experiments in transmission electron microscopy were performed to investigate the propagation of crack, twinning and interaction of crack with twins. Lots of micro-twins were observed in the deformation band near the tip of crack. The stress is relaxed by the formation of micro-twins and the densely developed micro-twins prevent the growth of crack from the deformation band, subsequently the cracks extend into adjacent grains across grain boundaries, and grow along cleavage plane. Multiple twins are observed in hot-rolling AZ31 magnesium alloys, when cracks propagate into twins through twin grain boundaries(GBs), the direction of growth deviates. It is concluded that twins, especially multiple twins effectively baffle the development of crack. 相似文献
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