Mg-Zn系合金热裂行为的研究进展
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王峰, 白盛巍, 王志, 杜旭东, 周乐, 毛萍莉, 魏子淇, 李瑾伟
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Research Progress on Hot Tearing Behavior of Mg-Zn Series Alloys
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WANG Feng, BAI Shengwei, WANG Zhi, DU Xudong, ZHOU Le, MAO Pingli, WEI Ziqi, LI Jinwei
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表6 第二相种类对镁合金热裂行为的作用机理
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Table 6 Mechanism of the secondary phase species on hot tearing behavior of magnesium alloys
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| Phase | Condition | Effect |
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| High melting point eutectic phase | Low volume | Increasing the non-uniform nucleation site; refining the grains; | | | increasing the content of the liquid film subjected to shrinkage stress/strain; | | | reducing the HTS of the alloy | | High volume | Blocking the feeding channel; | | | reducing the feeding efficiency of alloy at the end of solidification; | | | increasing the HTS of the alloy | Low melting point eutectic phase | Thci < TLMPE | Liquid film theory and intergranular bridging theory: The low melting eutectic phase precipitated before hot tearing initiation acts as “bridges” to fix the grain boundary on both sides. Under the action of surface tension and bridge, the intergranular bonding force improved | | Thci ≥ TLMPE | Liquid film theory: The intergranular binding force is only provided by the surface tension of the liquid film covering the dendrite surface |
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