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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of temperature on synthesis and properties of aluminum-magnesium mechanical alloys
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Effect of temperature on synthesis and properties of aluminum-magnesium mechanical alloys

机译：温度对铝镁机械合金合成及性能的影响

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摘要

The synthesis of an Al_(0.7)Mg_(0.3) mechanical alloy was studied using a planetary mill. Several distinct temperature regimes of mechanical alloying were achieved using milling jars equipped with finned heat sinks and an external air conditioner installed to cool the entire milling chamber. Wireless temperature sensors were attached to the milling jars to monitor the process temperature. Intermediate and final products were collected and were analyzed by electron microscopy and X-ray diffraction. The temperature history of the milling jars exhibited two peaks during mechanical alloying. The first peak occurred when particles of the starting powders deformed to produce flakes. The second peak was observed when the flakes agglomerated and re-fragmented forming layered composites that served as precursors for the mechanical alloy. The temperature of milling affected the magnesium solubility of the produced Al-Mg mechanical alloys. Decreasing the milling temperature from approx 70-80 deg C to 20-30 deg C resulted in an increase of the dissolved Mg concentration in Al from 2-3 at. percent to approx 25 at. percent for the Al_(0.7)Mg_(0.3) composition. The formation of intermetallic phases was favored at higher milling temperatures, where high solubilities cannot be achieved.
机译：使用行星式轧机研究了Al_（0.7）Mg_（0.3）机械合金的合成。使用配备有翅片散热器的研磨罐和安装用于冷却整个研磨室的外部空调，可以实现几种不同的机械合金化温度范围。无线温度传感器连接到研磨罐，以监控过程温度。收集中间体和最终产物，并通过电子显微镜和X射线衍射进行分析。在机械合金化过程中，研磨罐的温度历史显示出两个峰值。当起始粉末的颗粒变形以产生薄片时，出现第一个峰。当薄片团聚并再破碎形成层状复合材料时，观察到第二个峰，该层状复合材料用作机械合金的前体。研磨温度影响所生产的Al-Mg机械合金的镁溶解度。将研磨温度从大约70-80摄氏度降低到20-30摄氏度，导致铝中溶解的Mg浓度从2-3 at增加。 ％到大约25 at。 Al_（0.7）Mg_（0.3）成分的百分比。金属间相的形成在较高的研磨温度下是有利的，在该温度下不能实现高溶解度。

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