Effect of LaCl3 on the Structure and Properties of Magnesium Alloys
Effect of LaCl3 on the Structure and Properties of Magnesium Alloys
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DOI：
10.4028/www.scientific.net/msf.488-489.111
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发表时间：
2005-03
期刊：
影响因子：
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通讯作者：
Guohua Wu;Hong Guo;X. Zeng;W. Ding
中科院分区：
文献类型：
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作者：
Guohua Wu;Hong Guo;X. Zeng;W. Ding
利用Zwick电子万能材料试验机、x射线衍射仪、SEM、EDX、图像分析仪和腐蚀试验，研究了LaCl3对镁合金力学性能、组织、断口形貌和腐蚀行为的影响。结果表明：在Mg熔体中加入含有LaCl3的助熔剂后，可以在Mg熔体中形成细小的Al10La2Mn7相。Al10La2Mn7相可以作为γ相的成核位点，γ相可以细化。当熔剂中LaCl3含量为5%时，镁合金的σb和δ分别从161MPa和2.1%提高到203MPa和4.0%，分别提高了26%和100%。镁合金的腐蚀速率可从1.10 mg/(cm2)降低。D)至0.17 mg/(cm2。d)使用含有5% LaCl3的助熔剂，降低84%。稀土（RE）元素常被添加到镁合金中，以改善合金组织和室温或高温力学性能。但到目前为止，镁熔体中添加的稀土元素多以纯稀土合金或稀土母合金[1]的形式存在。由于稀土是可氧化材料，这种添加工艺往往导致稀土利用率低，使用成本高。此外，该过程容易导致稀土偏析，出现的稀土粗相会降低镁合金的力学性能。到目前为止，关于在镁合金熔体中添加稀土化合物的研究报道很少。本文首次研究了氯化镧（LaCl3）对镁合金组织和力学性能的影响。目的是探索提高镁合金性能的新途径。
By use of the Zwick electronic universal material testing machine, X-ray diffractometer, SEM, EDX, image analyzer and corrosion test, the effects of LaCl3 on the mechanical properties, structure, fractography and corrosion behavior of magnesium alloy have been studied. The results show that minute nodular Al10La2Mn7 phases can be formed in Mg melts after fluxes containing LaCl3 are added to Mg melt. The Al10La2Mn7 phases can act as the nucleating site of γ phases, and the γ phases can be refined. With the flux containing 5% LaCl3, the σb and δ of the Mg alloy can be improved from 161MPa and 2.1% to 203MPa and 4.0% by 26% and 100%, respectively. The corrosion rate of magnesium alloys can decrease from 1.10 mg/(cm2.d) to 0.17 mg/(cm2.d) by 84% with the use of flux containing 5% LaCl3. Rare earth (RE) elements are often added to the magnesium alloy to improve the alloy structure and the room or elevated temperature mechanical properties. But up to present, the RE elements added to Mg melt is often in the form of pure RE alloy or RE master alloy [1]. Because RE is the oxidizable material, this kind of adding process often leads to low RE utilization ratio and high use-cost. Besides, this process can easily induce segregation of RE and the appeared coarse RE phases will lower the Mg alloy mechanical properties. By far, there is few research reports about RE contained compound added to Mg alloy melt. In this paper, the effects of Lanthanum chloride (LaCl3) on the structure and mechanical properties of Mg alloy are studied for the first time. The aim is to explore a new way to improve the Mg alloy properties.