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首页> 外文会议>International Conference on Solidification and Gravity; 20040906-09; Miskolc-Lillafured(HU) >Thermal Analysis of the Mg-Al Alloys
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Thermal Analysis of the Mg-Al Alloys

机译：镁铝合金的热分析

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摘要

The solidification of the mostly used Mg-alloys could be considered after the Mg-Al phase diagram. The equilibrium solubility of Al in Mg at the eutectic temperature of 437℃ is 12,6 mass.%. According to the solvus line of the Mg-Al phase diagram the intermetallic compound of Mg_(17)Al_(12) is precipitating on the boundaries of the primary Mg grains after the completed solidification. Solidification of the binary magnesium aluminium alloys has been investigated with a new three thermal analysis at three different cooling rates at the same time. The investigation of solidification has been taking place by evaluation of the cooling curves in connection with metallographic examinations, simultaneous thermal analyses (STA) and thermodynamic calculations. The following characteristic temperatures of the solidification process have been established from the cooling curves and STA curves: the liquidus temperature T_L, solidus T_S, and eutectic temperature TE, respectively. At the cooling rates smaller then 5 K/s the non equilibrium eutectic (α_(Mg) + Mg_(17)Al_(12)) is observed in alloys with concentration higher then 4 mass.% Al which is precipitating on the boundaries of the primary α_(Mg) grains. It is caused by the local Al - microsegregations. This effect was not observed in the case of commercial MgAl5Mn alloy, due to the formation of the Al_4Mn intermetallic compound phase. The consequence of that is the decreased concentration of the dissolved Al in the Mg-Al liquid solution.
机译：在Mg-Al相图之后，可以考虑最常用的Mg合金的凝固。共晶温度为437℃时，Al在Mg中的平衡溶解度为12.6质量％。根据Mg-Al相图的固溶线，在完全凝固后，Mg_（17）Al_（12）的金属间化合物沉淀在初生Mg晶粒的边界上。在新的三种热分析下，同时以三种不同的冷却速率对二元镁铝合金的凝固进行了研究。凝固的研究已经通过结合金相检查，同时热分析（STA）和热力学计算的冷却曲线评估来进行。已根据冷却曲线和STA曲线建立了以下凝固过程的特征温度：液相线温度T_L，固相线T_S和共晶温度TE。在小于5 K / s的冷却速率下，在浓度高于4质量％的合金中观察到非平衡共晶（α_（Mg）+ Mg_（17）Al_（12））析出在合金的边界上。初级α_（Mg）晶粒。它是由局部的Al-微偏析引起的。由于形成了Al_4Mn金属间化合物相，因此在商用MgAl5Mn合金中未观察到这种效果。其结果是降低了Mg-Al液体溶液中溶解的Al的浓度。

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