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首页> 外文期刊>Materials Science and Engineering >Dynamic restoration and microstructural evolution during hot deformation of a P/M A16063 alloy
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Dynamic restoration and microstructural evolution during hot deformation of a P/M A16063 alloy

机译：P / M A16063合金热变形过程中的动态恢复和组织演变

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摘要

Hot deformation behavior of A16063 alloy produced by direct powder extrusion was studied by means of uniaxial compression test in the temperature range between 300 and 450 ℃ and strain rate range between 0.01 and 1 s~(-1). Electron backscatter diffraction (EBSD) technique and transmission electron microscopy (TEM) were utilized to study the microstructure of the material before and after the hot deformation. The microstructure of the extruded alloy consisted of elongated grains within a subgrain structure and small grains free of low angle grain boundaries (LAGBs). An equiaxed duplex microstructure consisting of large substructured grains and fine grains separated by high angle grain boundaries (HAGBs) were observed after hot deformation. Evaluation of the hot-deformation activation energy using a hyperbolic sine law yielded a value of 198 kJ mol~(-1). The kinetic analysis and microstructural changes suggest that dynamic restoration mechanisms, i.e., dynamic recovery (DRV) and dynamic recrystallization (DRX), are operative to cause flow softening during hot compression. Correlations between Zener-Hollomon parameters and the size of subgrains and recrystallized grains were established. It was found that DRV prevailingly occurred at high Z values (Z> 1.12 × 10~(16)) while DRX was the dominant mechanism at the low Z values.
机译：通过单轴压缩试验研究了直接粉末挤压生产的A16063合金在300至450℃的温度范围和0.01至1 s〜（-1）的应变速率下的热变形行为。利用电子背散射衍射（EBSD）技术和透射电子显微镜（TEM）研究热变形前后材料的微观结构。挤压合金的微观结构由亚晶粒结构内的细长晶粒和无低角度晶界（LAGB）的小晶粒组成。热变形后，观察到了由大的亚结构晶粒和由高角度晶界（HAGBs）隔开的细晶粒组成的等轴双工微观组织。利用双曲正弦定律评估热变形活化能的值为198 kJ mol〜（-1）。动力学分析和微观结构变化表明，动态恢复机制，即动态恢复（DRV）和动态重结晶（DRX），可在热压缩过程中引起流动软化。建立了齐纳-所罗门参数与亚晶粒尺寸和再结晶晶粒之间的相关性。研究发现，DRV主要发生在高Z值时（Z> 1.12×10〜（16）），而DRX是低Z值时的主导机制。

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