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挤压铸造准晶增强AZ91D镁基复合材料组织与性能
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中北大学材料科学与工程学院,材料科学与工程学院,材料科学与工程学院,材料科学与工程学院

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中图分类号:

TG146.2

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


Microstructure and mechanical properties of squeeze casting quasicrystal reinforced AZ91D magnesium matrix composites
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Affiliation:

College of Materials Science and Engineering,North University of China,College of Materials Science and Engineering,North University of China,College of Materials Science and Engineering,North University of China,College of Materials Science and Engineering,North University of China

Fund Project:

the Pre-Research Project of National Key Basic Research Program (2012CBT22702); the New Century Excellent Talents Program of Ministry of Education (NCET-10-0137)

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    摘要:

    为了改善AZ91D镁合金的性能,采用挤压铸造法制备了Mg-Zn-Y准晶中间合金增强AZ91D镁基复合材料,研究了准晶中间合金含量对复合材料组织和性能的影响。结果表明挤压铸造工艺可以有效细化晶粒,复合材料的显微组织主要由α-Mg基体、晶界上分布的β-Mg17Al12相以及Mg3Zn6Y准晶颗粒组成,准晶颗粒和α-Mg基体之间形成稳定结合。当准晶中间合金含量为5%时,抗拉强度和断后伸长率达到最大值,分别为194.3MPa和9.2%。复合材料的强化机制为细晶强化和准晶颗粒强化。

    Abstract:

    To improve the mechanical properties of AZ91D alloy, squeeze casting process was employed to fabricate AZ91D magnesium matrix composites reinforced with stable icosahedral quasicrystal particles which were introduced as Mg-Zn-Y quasicrystal master alloy. The effects of quasicrystal master alloy content on microstructure and mechanical properties of composites were investigated. The results show that squeeze casting process is an effective method to refine grain size. The composites comprise α-Mg matrix, β-Mg17Al12 phases that disperse on grain boundaries and Mg3Zn6Y quasicrystal particles. A stable interface between the quasicrystal particles and the Mg matrix is observed. The composite exhibits the maximum ultimate tensile strength of 194.3 MPa and the maximum elongation of 9.2% respectively when the mass fraction of quasicrystal master alloy is 5%. The reinforcement mechanism is concluded as fine-grain strengthening and quasicrystal particle strengthening.

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杨玲,侯华,赵宇宏,杨晓敏.挤压铸造准晶增强AZ91D镁基复合材料组织与性能[J].稀有金属材料与工程,2016,45(8):1978~1982.[Yang Ling, Hou Hua, Zhao Yuhong, Yang Xiaomin. Microstructure and mechanical properties of squeeze casting quasicrystal reinforced AZ91D magnesium matrix composites[J]. Rare Metal Materials and Engineering,2016,45(8):1978~1982.]
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  • 收稿日期:2015-07-10
  • 最后修改日期:2015-08-23
  • 录用日期:2015-09-07
  • 在线发布日期: 2016-10-09
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