4C3顆粒和Al-Fe相表面包覆Al4C3相的雙相顆粒,兩者均可以作為α-Mg晶粒的有效形核核心。Sr易于朝顆粒表面偏聚和富集,從而降低顆粒表面能和相間的界面能,促進(jìn)雙相結(jié)構(gòu)顆粒的生成,并可抑制晶核組分和結(jié)構(gòu)變化,提高晶核結(jié)構(gòu)穩(wěn)定性,從而有效抑制晶核毒化和孕育衰退。"/>

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Sr對碳質(zhì)孕育Mg-3%Al合金熔體中Fe致晶核毒化與衰退的抑制作用
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華南理工大學(xué) 材料科學(xué)與工程學(xué)院

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國家自然科學(xué)基金(51574127)


Inhibiting behavior of Sr on nuclei poisoning and fading of Mg-3%Al melt inoculated by carbon
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School of Materials Science and Engineering,South China University of Technology

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    摘要:

    利用碳和Sr對Mg-3%Al合金進(jìn)行復(fù)合孕育處理,引入雜質(zhì)Fe并調(diào)整孕育保溫時(shí)間,研究雜質(zhì)Fe對孕育細(xì)化效果和晶核結(jié)構(gòu)特性的影響。結(jié)果表明：碳和Sr復(fù)合孕育可有效細(xì)化Mg-3%Al合金,雜質(zhì)Fe添加及其與添加順序?qū)?xì)化效果沒有影響。延長保溫時(shí)間至80 min,晶粒尺寸最高從560 μm一直穩(wěn)定在100~130 μm之間。Sr存在可有效抑制Fe對碳質(zhì)孕育細(xì)化效果的粗化和加速孕育衰退的不利影響。晶核結(jié)構(gòu)觀測表明孕育合金中主要存在Al4C3顆粒和Al-Fe相表面包覆Al4C3相的雙相顆粒,兩者均可以作為α-Mg晶粒的有效形核核心。Sr易于朝顆粒表面偏聚和富集,從而降低顆粒表面能和相間的界面能,促進(jìn)雙相結(jié)構(gòu)顆粒的生成,并可抑制晶核組分和結(jié)構(gòu)變化,提高晶核結(jié)構(gòu)穩(wěn)定性,從而有效抑制晶核毒化和孕育衰退。

    Abstract:

    The Mg-3%Al melt was inoculated by carbon combining with Sr addition. The trace impurity Fe was introduced into the melt and the holding time after carbon-inoculation was adjusted. The effect of impurity Fe on grain refinement and structure characteristics of the nucleating particle was studied by adjusting the sequence of Fe introduction and holding time. The results show that the Mg-3%Al alloy was significantly refined by carbon inoculation combining with Sr addition. The addition of impurity Fe and its sequence had no obvious effect on the grain refinement. The grain size was refined from 560 μm to the range between 100 and 130 μm. The grain size after been inoculated kept stable with increasing in the holding time to 80 min. The presence of Sr could effectively inhibit the adverse effects of Fe-induced grain coarsening and accelerating the fading of carbon inoculation. There existed two types of particles could be easily observed in the inoculated Mg-3%Alloy containing with trace Fe impurity. One was the Al4C3 particles. The other one is dual-phased particles of Al-Fe phase coated with Al4C3. Both of the particles should be the potent nuclei of α-Mg grains. Higher Sr content in the particles was measured. Active element Sr easily segregate and enrich towards the surface of particles, reducing the surface energy and interfacial energy of particles. The segregation of Sr can promote the formation of dual-phase particles and improve the stability of potent nuclei. Consequently, the Fe-induced nuclei-poisoning and the fading of inoculation could be effectively inhibited due to Sr addition in the carbon-inoculated Mg-Al melt.

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李乘波,溫澄,杜軍,李文芳. Sr對碳質(zhì)孕育Mg-3%Al合金熔體中Fe致晶核毒化與衰退的抑制作用[J].稀有金屬材料與工程,2020,49(1):216~224.[Li Chengbo, Wen Cheng, Du Jun, Li Wenfang. Inhibiting behavior of Sr on nuclei poisoning and fading of Mg-3%Al melt inoculated by carbon[J]. Rare Metal Materials and Engineering,2020,49(1):216~224.]
DOI：10.12442/j. issn.1002-185X.20181238

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  • 收稿日期:2018-12-11
  • 最后修改日期:2019-01-04
  • 錄用日期:2019-02-21
  • 在線發(fā)布日期: 2020-02-16
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