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均勻化熱處理對(duì)新型Al-Cu-Li-Ce合金的微觀結(jié)構(gòu)的影響
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中南大學(xué),中南大學(xué), 材料科學(xué)與工程學(xué)院，2011有色金屬先進(jìn)結(jié)構(gòu)材料與制造協(xié)同創(chuàng)新中心; 煙臺(tái)南山學(xué)院，工學(xué)院;,中南大學(xué),中南大學(xué),中南大學(xué)

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總裝備部重點(diǎn)基金項(xiàng)目（6140506）；山東省科技發(fā)展計(jì)劃項(xiàng)目(2014GGX102006）


Microstructure Evolution of a Novel Al–Cu–Li–Ce Alloy During Homogenization
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School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering, 2011 non-ferrous metal structural materials and advanced manufacturing collaborative innovation center Central South University; School of Engineering, Yantai Nanshan University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University

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    摘要:

    本論文研究了一種添加Ce并具有高Cu/Li的新型Al–Cu–Li–Ce合金在雙極均勻化熱處理過程中微觀結(jié)構(gòu)的演化過程,并重點(diǎn)探討了該合金中?1(Al8Cu4Ce)相的形成過程及其形成機(jī)制。在凝固過程中Ag, Mg富集的粗大的TB (Al7Cu4Li)相和原生的AlCuCe相共同形成。雙極均勻化熱處理后有兩種類型的?1相出現(xiàn)。該相的形成模式包括，通過Ce不斷的由Al基體向在TB相上新形核的?1相擴(kuò)散并導(dǎo)致該粒子不斷長大，以及原生的AlCuCe相通過不斷縮水并伴隨Cu,Ce向各個(gè)方向擴(kuò)散，由之轉(zhuǎn)變?yōu)榧?xì)小彌散的?1相。同時(shí)分析發(fā)現(xiàn)在合金凝固過程中產(chǎn)生的這種先析AlCuCe相，不但能夠促進(jìn)晶粒形核，同時(shí)能夠阻止晶粒進(jìn)一步長大，最終導(dǎo)致含鈰的鑄態(tài)合金晶粒得到細(xì)化。

    Abstract:

    The present work aims to clarify the formation of the ?1(Al8Cu4Ce) phase and its formation mechanism in the high Cu content alloy with Ce addition. The microstructure evolution during the two-step homogenization annealing process was investigated in the novel high Cu/Li Al–Cu–Li–Ce alloy. The formation of the coarse Ag Mg enriched TB (Al7Cu4Li) phase and the primary AlCuCe phase was found to occur under solidification. Two types of the minor ?1 phases were found to form after homogenization. It is concluded that the ?1 phase nucleation mechanism could involve either nucleation on an existing TB phase by Ce diffusion from the Al matrix or the transformation of the primary AlCuCe phase into the ?1 phase by Ce diffusion through the coarse primary AlCuCe phase shrink. It also can be deduced that the grain refinement is mainly the result of the primary AlCuCe promoting ? (Al) nucleation and further prohibiting the grain growth for the experimental alloy.

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余鑫祥,尹登峰,余志明,張亦然,李樹飛.均勻化熱處理對(duì)新型Al-Cu-Li-Ce合金的微觀結(jié)構(gòu)的影響[J].稀有金屬材料與工程,2016,45(7):1687~1694.[Yu Xinxiang, Yin Dengfeng, Yu Zhiming, Zhang Yiran, Li Shufei. Microstructure Evolution of a Novel Al–Cu–Li–Ce Alloy During Homogenization[J]. Rare Metal Materials and Engineering,2016,45(7):1687~1694.]
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  • 收稿日期:2015-02-14
  • 最后修改日期:2015-05-28
  • 錄用日期:2015-10-13
  • 在線發(fā)布日期: 2016-10-09
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