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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Effect of thermal treatment on microstructure in high pressure torsion (HPT) deformed nickel
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Effect of thermal treatment on microstructure in high pressure torsion (HPT) deformed nickel

机译：热处理对高压变形（HPT）变形镍组织的影响

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摘要

Polycrystalline 99.9% Ni has been deformed at room temperature to equivalent strains of about 55 by high pressure torsion (HPT) deformation under a hydrostatic pressure of about 7 GPa. After annealing at different temperatures the structural element (grain/subgrain, scattering domain) size was determined by using scanning electron microscopy and multiple X-ray Bragg profile analysis in order to draw a correlation to the strength evolution obtained by microhardness measurements. There has to be differentiated with respect to the occurring characters of the microstructure—the as-deformed and recovered microstructure, respectively, and the structure resulting after recrystallisation. The strength is directly correlated to the grain size and decreases when the grain size starts to increase at homologous temperatures above 0.4T_m. The recovery of the very high dislocation density is shifted to low temperatures starting even at 0.2T_m and has primarily no effect on the strength.
机译：在大约7 GPa的静水压力下，高压扭转（HPT）变形已在室温下将多晶99.9％Ni变形为大约55的等效应变。在不同温度下退火后，通过使用扫描电子显微镜和多次X射线布拉格分布分析确定结构元素（晶粒/亚晶粒，散射域）的大小，以得出与通过显微硬度测量获得的强度演变的相关性。必须区分微观结构的发生特性，分别是变形后的微观结构和恢复后的微观结构，以及重结晶后得到的结构。强度与晶粒尺寸直接相关，并且在高于0.4T_m的同源温度下晶粒尺寸开始增加时强度降低。从0.2T_m开始，非常高的位错密度的恢复也转移到了低温，并且对强度没有影响。

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