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首页> 外文期刊>Metals >Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture
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Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture

机译：不同温度下挤压的AZ31镁合金的热变形机理：织构的影响

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The hot deformation characteristics of AZ31 magnesium alloy rod extruded at temperatures of 300 °C, 350 °C and 450 °C have been studied in compression. The extruded material had a fiber texture with 100 parallel to the extrusion axis. When extruded at 450 °C, the texture was less intense and the 100 direction moved away from the extrusion axis. The processing maps for the material extruded at 300 °C and 350 °C are qualitatively similar to the material with near-random texture (cast-homogenized) and exhibited three dynamic recrystallization (DRX) domains. In domains #1 and #2, prismatic slip is the dominant process and DRX is controlled by lattice self-diffusion and grain boundary self-diffusion, respectively. In domain #3, pyramidal slip occurs extensively and DRX is controlled by cross-slip on pyramidal slip systems. The material extruded at 450 °C exhibited two domains similar to #1 and #2 above, which moved to higher temperatures, but domain #3 is absent. The results are interpreted in terms of the changes in 100 fiber texture with extrusion temperature. Highly intense 100 texture, as in the rod extruded at 350 °C, will enhance the occurrence of prismatic slip in domains #1 and #2 and promotes pyramidal slip at temperatures 450 °C (domain #3).
机译：研究了AZ31镁合金棒材在300°C，350°C和450°C温度下的热变形特性。挤出的材料具有平行于挤出轴的<100>的纤维质地。在450°C下挤出时，织构的强度降低，<100>方向移离挤出轴。在300°C和350°C下挤出的材料的加工图在质上类似于具有近乎随机织构（浇铸均质）的材料，并显示三个动态重结晶（DRX）域。在域＃1和＃2中，棱柱形滑动是主要过程，而DRX分别由晶格自扩散和晶界自扩散控制。在域＃3中，金字塔形滑移广泛发生，DRX由金字塔形滑移系统上的交叉滑移控制。在450°C下挤出的材料表现出两个与上面的＃1和＃2类似的区域，它们移至更高的温度，但没有区域＃3。根据<100>纤维质地随挤出温度的变化来解释结果。如在350°C下挤压的棒中的高强度<100>织构，将增强在＃1和＃2域中棱柱形滑移的发生，并在> 450°C（第3域）温度下促进棱锥滑移。

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