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等通道转角挤压ZK31+4Si镁合金的显微组织及高温蠕变行为
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山西省青年科技研究基金(2008021033);山西省归国留学基金(2007-25);山西省大学生创新创业专项基金(07010727)


Microstructure and Creep Behavior of ECAPed ZK31+4Si Magnesium Alloy
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    摘要:

    研究ZK31+4Si镁合金经等通道转角挤压 (ECAP) 后的微观组织和高温蠕变行为。结果表明,ECAP挤压可显著细化原铸态组织中粗大的汉字状Mg2Si相,并使其趋于均匀弥散分布。ECAP挤压后试样的抗蠕变性能明显优于铸态试样,在温度为473 K,应力为70 MPa的条件下,8道次挤压试样的稳态蠕变速率约为铸态试样的1/15,蠕变寿命提高近8倍。由稳态蠕变速率与应力的对数曲线关系求得473 K下4道次挤压和8道次挤压试样的应力指数n均约为4,同时按位错蠕变机制,当应力指数n=4时,理论计算所得稳态蠕变速率与实验值非常吻合,说明在本实验条件下发生的是位错蠕变。

    Abstract:

    The microstructures and the creep behavior of ZK31+4Si magnesium alloy processed by Equal channel angular pressing (ECAP) were investigated. The experimental results show that the coarse Chinese script-like Mg2Si precipitates are refined to fine polygonal shape particles and redistributed dispersedly after ECAP. The creep resistance is greatly enhanced after ECAP. The ctable creep rate of the 8-pass ECAPed specimen is nearly 1/15 of that of the as-cast one, and its creep life is increased by about 8 times. The curves of the minimum strain rate versus the stress show that the alloy ECAPed either through 8 passes or through 4 passes exhibit a same stress exponent n?4. Furthermore, the theoretical calculation results according to the dislocation creep model with n=4 are well in agreement with the experimental values, indicating that the creep under the present test condition is controlled by the movement of dislocations.

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周旭阳,梁 伟,韩富银,谢国印.等通道转角挤压ZK31+4Si镁合金的显微组织及高温蠕变行为[J].稀有金属材料与工程,2012,41(5):867~871.[Zhou Xuyang, Liang Wei, Han Fuyin, Xie Guoyin. Microstructure and Creep Behavior of ECAPed ZK31+4Si Magnesium Alloy[J]. Rare Metal Materials and Engineering,2012,41(5):867~871.]
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  • 收稿日期:2011-05-12
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