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不同速率定向凝固條件Mg-1.5Gd鎂合金的微觀結(jié)構(gòu)及微觀偏析
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華電電力科學(xué)研究院,西北工業(yè)大學(xué)

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Microstructures and Microsegregation of Directionally Solidified Mg-1.5Gd Magnesium Alloy with Different Growth Rate
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China HuaDian Electric Power Research Institute,Northwestern Polytechnical University

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    摘要:

    本文研究了在定向凝固條件下凝固速率對(duì)Mg-1.5Gd鎂合金微觀結(jié)構(gòu)的影響。試樣通過(guò)Bridgman定向凝固爐來(lái)制備，溫度梯度恒定為40K/mm，凝固速率為10-200μm/s。研究發(fā)現(xiàn)，Mg-1.5Gd鎂合金凝固組織為典型胞晶結(jié)構(gòu)，通過(guò)線性擬合得到胞晶間距與凝固速率關(guān)系為：λ= 130.2827V-0.222，此結(jié)論與Trivedi模型擬合較好。通過(guò)Scheil模型進(jìn)行熱力學(xué)凝固路徑計(jì)算，結(jié)合試驗(yàn)觀察可以確定凝固組織為α(Mg)相和α(Mg) Mg5Gd二元共晶相。同時(shí)，通過(guò)Scheil模型計(jì)算所得的Gd元素的微觀偏析與EPMA測(cè)量結(jié)果基本一致。

    Abstract:

    Directional solidified Mg-1.5Gd (wt.%) magnesium alloy was carried out to investigate the effects of the growth rate on the microstructures under controlled solidification conditions. A Bridgman-type directional solidification furnace with liquid metal cooling (LMC) technology was used to solidify the specimens, which could provide steady state conditions with a constant temperature gradient (40K/mm) at a wide range of growth rate (10-200μm/s). The microstructures were observed to be cellular structures, and the relationship between cellular spacing (λ) and growth rate (V) was established in the form: λ= 130.2827V-0.2228 by using a linear regression analysis, which was in good agreement with the calculated values by Trivedi model. The thermodynamics solidification path calculations by Scheil model and experimental observations confirm that the solidification microstructure in the alloy consists of primary α(Mg) phase and binary eutectic α(Mg) Mg5Gd phase. Meanwhile, the microsegregation of the alloying element predicted by the Scheil model agrees reasonably with the electron probe microanalysis (EPMA) measurements.

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王甲安,王甲賀.不同速率定向凝固條件Mg-1.5Gd鎂合金的微觀結(jié)構(gòu)及微觀偏析[J].稀有金屬材料與工程,2017,46(1):12~16.[wangjiaan, wangjiahe. Microstructures and Microsegregation of Directionally Solidified Mg-1.5Gd Magnesium Alloy with Different Growth Rate[J]. Rare Metal Materials and Engineering,2017,46(1):12~16.]
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  • 收稿日期:2014-09-17
  • 最后修改日期:2014-10-28
  • 錄用日期:2014-12-03
  • 在線發(fā)布日期: 2017-03-16
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