J. Mater. Sci. Technol. ›› 2009, Vol. 25 ›› Issue (03): 395-400.

• Letters • 上一篇    下一篇

AZ31镁合金连续半固态挤压过程的金属动态凝固与流动行为

管仁国1;陈礼清2   

  1. 1.
    2. 东北大学
  • 收稿日期:2008-01-28 出版日期:2009-05-28 发布日期:2009-10-10
  • 通讯作者: 管仁国
  • 基金资助:

    国家高技术研究发展计划（863）;国家自然科学基金;国家高技术研究发展计划（863）;国家自然科学基金

Dynamical Solidification Behaviors and Metal Flow during Continuous Semisolid Extrusion Process of AZ31 Alloy

Renguo Guan1)†, Liqing Chen2), Jiangping Li1), Fuxing Wang1)   

  1. 1) School of Materials and Metallurgy, Northeastern University, 3-11 Wenhua Road, Shenyang 110004, China
    2) The State Key Laboratory of Rolling and Automation, Northeastern University, 3-11 Wenhua Road, Shenyang 110004, China
  • Received:2008-01-28 Online:2009-05-28 Published:2009-10-10
  • Supported by:

    National High-Tech R&D Program of China (Grant No. 2007AA03Z111),
    Natural Science Foundation of China (Grant No. 50604007)
    New Century Excellent Talents in University (Grant No. NCET-06-0285 and NCET-08-0097).

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摘要：

本文提出了一种新型的短流程金属成形技术，镁合金连续半固态挤压技术（CSEP）。研究了该过程中金属动态凝固与流动行为。在AZ31镁合金连续半固态挤压过程中，发现了非均匀组织和非平衡凝固行为，同时发现了过程中金属组织从枝晶向玫瑰晶和球形晶的演化行为。浇注温度、辊靴型腔宽度和冷却强度对浇注过程和金属流动产生重要影响，710－750℃浇注温度为合理温度范围。在金属成形过程中，白色固相被强烈拉伸，液相相应地相间分布其晶界边缘，并呈带状分布。

Abstract:

In this paper, a novel near-net-shape forming process, continuous semisolid extrusion process (CSEP) of AZ31 alloy was proposed, and the dynamical solidification behaviors and metal flow during the process were firstly investigated. During casting AZ31 alloy by this process, non-uniform microstructure distributions and non-equilibrium solidification region near the roll surface were found in the roll-shoe gap. Microstructural evolution from dendrite to rosette and spherical grains was observed during the casting by CSEP. Casting temperature, roll-shoe gap width and cooling ability have great effect on casting process and metal flow, so these factors should be carefully controlled, a proper casting temperature of 710×750°C is suggested. The white ® phases were strongly stretched during the processing, and the remnant liquids are correspondingly distributes along the solid phase boundaries and also show stripped lines.

Key words: Dynamical solidification, Continuous semisolid extrusion process, Micro structural evolution, AZ31 alloy