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主要是结合X射线衍射(XRD)技术以及电子背散射衍射(EBSD)技术,对不同退火温度下的多晶纯钴的退火组织的变化规律展开研究。结果表明:残留的多晶纯钴面心立方(fcc)结构的晶粒内部在退火过程中形成了∑3孪晶界,而且具有这种特征的晶粒数量随退火温度改变不大,基本趋于稳定;同时,具有密排六方(hcp)结构的晶粒内部在退火过程中形成大量的71.4°/<1120>特殊晶界。通过分析得知这种晶界形成的原因与fcc结构的晶粒中的∑3晶界的形成原因不同,是由fcc→hcp马氏体相变导致,即为相变孪晶。
Mainly combined with X-ray diffraction (XRD) technology and electron backscatter diffraction (EBSD) technology, the annealing temperature of the polycrystalline pure cobalt annealed structure of the study. The results show that Σ3 twin boundaries are formed in the interior of the residual polycrystalline pure cobalt face centered cubic (fcc) structure, and the number of grains with this characteristic does not change much with the annealing temperature. The basic trend At the same time, a large number of special grain boundaries of 71.4 ° / <1120> were formed in the interior of the grains with a hexagonal close-packed hexagonal structure. The reason for the formation of this grain boundary is different from the formation of the Σ3 grain boundary in the fcc structure, which is caused by the transformation of fcc → hcp martensite, which is the phase transition twin.