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往复挤压纯镁的组织演变和力学性能

Keywords: 金属材料,纯镁,往复挤压,微观组织,力学性能,织构,晶粒尺寸

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Abstract:

?研究了纯镁在350℃往复挤压2,4,8道次,以及在250℃,350℃,450℃往复挤压2道次的组织和力学性能的变化规律。结果表明,纯镁经350℃往复挤压后,组织显著细化,挤压道次从2增加到8时,晶粒尺寸无明显变化,而屈服强度下降,延伸率提高。通过电子背散射衍射技术(ebsd)发现纯镁在350℃往复挤压2,4,8道次后,形成{0001}基面与挤压方向分别约成25°,30°,40°夹角的织构,且织构强度增加,基面滑移系的schmid因子上升。纯镁在250℃,350℃,450℃往复挤压2道次后,随着挤压温度下降,晶粒尺寸减小,屈服强度上升,屈服强度和晶粒尺寸之间的关系可表述为。

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