Effects of runner design and pressurization on the microstructure of a high-pressure die cast Mg–3.0Nd–0.3Zn–0.6Zr alloy

Tongtong Zhang, Wenbo Yu, Chaosheng Ma, Yuqi Zhou, Shoumei Xiong

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Tongtong Zhang, Wenbo Yu, Chaosheng Ma, Yuqi Zhou, and Shoumei Xiong, Effects of runner design and pressurization on the microstructure of a high-pressure die cast Mg–3.0Nd–0.3Zn–0.6Zr alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp.1310-1316. https://dx.doi.org/10.1007/s12613-021-2386-z
Tongtong Zhang, Wenbo Yu, Chaosheng Ma, Yuqi Zhou, and Shoumei Xiong, Effects of runner design and pressurization on the microstructure of a high-pressure die cast Mg–3.0Nd–0.3Zn–0.6Zr alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp.1310-1316. https://dx.doi.org/10.1007/s12613-021-2386-z
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研究论文

流道设计和增压压力对高压压铸Mg–3.0Nd–0.3Zn–0.6Zr镁合金微观组织的影响

  • 1)

    北京交通大学机械与电子控制工程学院材料科学与工程中心，北京 100044，中国

  • 2)

    清华大学材料科学与工程学院，北京 100084，中国

文章亮点

(1)采用了三维重构技术对孔洞缺陷进行了三维表征，并量化统计了铸件选定区域内的孔洞缺陷总体积。 (2)对流道进行了优化设计，设计出了一种ESC收集器，可以对在压室中预先形成的ESCs组织进行有效的收集，从而起到了细化晶粒，改善组织的作用。 (3) 阐明了预结晶组织ESC对铸件中孔洞缺陷和缺陷带组织的影响，探究了ESC收集器和凝固增压工艺对高压压铸Mg–3.0Nd–0.3Zn–0.6Zr镁合金微观组织与力学性能的影响。

中文摘要

为了阐明压室预结晶组织（ESC）与其他缺陷（如缺陷带和孔洞）之间的关系，本文采用了二维表征和三维重构相结合的方法研究了凝固压力和流道优化设计对压铸Mg–3.0Nd–0.3Zn–0.6Zr镁合金微观组织与力学性能的影响。凝固压力有效的降低了气孔体积和尺寸，其中对于心部的作用效果最为显著。ESCs收集器通过对压室中的ESCs进行收集，有效的减少了铸件中ESCs的尺寸和数量，其中ESCs的面积百分数和平均尺寸分别减少了7% 和8 μm。此外，连续交错的缺陷带组织得到了改善，缺陷带区域和心部区域的大尺寸缩松孔洞显著减少。通过对ESCs和孔洞缺陷的统计分析得出，高压压铸镁合金的机械性能与ESCs的尺寸和分数密切相关，而非铸件孔隙率，减少ESCs组织有效的降低了铸件中缩松孔洞缺陷的数量以及缺陷带宽。拉伸断口分析表明，ESCs的减少导致铸件拉伸断裂模式由穿晶断裂转变为沿晶断裂。

 

Research Article

Effects of runner design and pressurization on the microstructure of a high-pressure die cast Mg–3.0Nd–0.3Zn–0.6Zr alloy

Author Affilications
    • 1)

      Center of Materials Science and Engineering, School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China

    • 2)

      School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

    Corresponding author:

    Wenbo Yu E-mail: wbyu@bjtu.edu.cn

    Shoumei Xiong E-mail: smxiong@tsinghua.edu.cn

  • Received: 06 September 2021; Revised: 20 November 2021; Accepted: 21 November 2021; Available online: 24 November 2021
To clarify the relationship between externally solidified crystals (ESCs) and other defects, e.g., defect bands and pores, two dimensional (2D) and three dimensional (3D) characterization methods were adopted to analyze castings produced using a modified ingate system equipped with and without an ESC collector. The reduction of ESCs strongly reduced defect band width and shrinkage pore quantity. By reducing the quantity and size of ESCs, net-shrinkage pores were transformed into isolated island-shrinkage pores. We determined via statistical analysis that the mechanical properties of high pressure die castings were strongly related to the size and fraction of the ESCs rather than porosity volume. The reduction of ESCs also caused tensile transgranular fracture modes to transform into intergranular fracture modes. Additionally, casting pressurization strongly reduced pore morphology, volume, and size.

 

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