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Mg添加量對(duì)粉末冶金法制備泡沫鋁材料過(guò)程中AlSi7基合金發(fā)泡行為的影響
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沈陽(yáng)工業(yè)大學(xué),沈陽(yáng)工業(yè)大學(xué),沈陽(yáng)工業(yè)大學(xué),沈陽(yáng)第一機(jī)床廠

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Projiect (F13-078-2-00) supported by Shenyang science and technology plan, China; Projiect (L2013058) supported by Liaoning Provincial Department of Education, China;


Effect of Mg Addition on the Foaming Behaviour of AlSi7 Based Alloy Using the Powder Metallurgy Method
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School of Materials Science and Engineering,Shenyang University of Technology,School of Materials Science and Engineering,Shenyang University of Technology,School of Materials Science and Engineering,Shenyang University of Technology,Shenyang machine tool CoLTD

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    摘要:

    本文研究了高鎂添加量(2wt%, 4wt%, 6wt%)對(duì)AlSi7基合金發(fā)泡行為的影響。研究結(jié)果表明：鎂可以和Al粉表層的氧化物Al2O3以及添加的硅發(fā)生反應(yīng)，生成和鋁熔體具有良好潤(rùn)濕性的MgAl2O4相以及Mg2Si相，這兩相均能均勻的分布在泡沫體中以顆粒穩(wěn)定機(jī)理，減小重力和毛細(xì)排液，起到穩(wěn)定泡體的作用。高鎂添加量最重要的作用是改變泡沫體的早期形核、長(zhǎng)大方式，使泡體在液態(tài)熔池中以圓形孔的方式穩(wěn)定的形核和長(zhǎng)大，所以高鎂添加量的泡沫體可以得到高的膨脹率和良好的孔結(jié)構(gòu)。但鎂添加量過(guò)高時(shí)，熔體表面張力降低，泡體很容易破裂，反而會(huì)使泡沫體的最大膨脹體積降低、孔結(jié)構(gòu)惡化，綜合利弊，本論文得出的AlSi7基合金的最優(yōu)鎂添加量為4wt%。

    Abstract:

    In this paper, high Mg addition (2wt%, 4wt%, 6wt%) to AlSi7 alloy is researched. The results show that Mg can react with Al2O3 and Si element, the MgAl2O4 phase which has a good wettability with Al melt and Mg2Si phase are formed, both of them can uniformly distribute in the alloy and induce a particle based stabilization mechanism, which can significantly reduce the negative impact of gravity drainage and capillarity. High Mg content can also change the pores formation in early stage, pores nucleate in a pool of liquid and grow in a fairly spherical way, so high expansion rate and good pore structures can be obtained. The disadvantage of high Mg content is the decrease of surface tension which makes pores easy to bust. A good trade-off between the beneficial and adverse effects of Mg content for AlSi7 based alloy is 4wt%.

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郭志強(qiáng),馬冬輝,袁曉光,東雪. Mg添加量對(duì)粉末冶金法制備泡沫鋁材料過(guò)程中AlSi7基合金發(fā)泡行為的影響[J].稀有金屬材料與工程,2016,45(12):3068~3073.[Guo Zhiqiang, Ma Donghui, Yuan Xiaoguang, Dong Xue. Effect of Mg Addition on the Foaming Behaviour of AlSi7 Based Alloy Using the Powder Metallurgy Method[J]. Rare Metal Materials and Engineering,2016,45(12):3068~3073.]
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  • 收稿日期:2016-03-18
  • 最后修改日期:2016-04-21
  • 錄用日期:2016-05-19
  • 在線發(fā)布日期: 2017-02-06
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