7Cu4Li中間相；當(dāng)含鈰量達(dá)到0.5wt.%,一種新型的灰色CuSi(AgMg)相出現(xiàn)；然而粗大的桿狀A(yù)l2CuLi相在含鈰量達(dá)到0.3wt%就已經(jīng)完全消失。分析表明：鈰添加導(dǎo)致本試驗(yàn)合金中的平衡相的析出序列和凝固行為發(fā)生了改變；同時(shí)分析發(fā)現(xiàn)在合金凝固過程中產(chǎn)生的一種先析Al8Cu4Ce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。"/>

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Ce含量對新型Al-Cu-Li合金的凝固行為及其平衡相的影響
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中南大學(xué),中南大學(xué),煙臺南山學(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 (No. 2014GGX102006)


Solidification behaviour and the effects of cerium on the intermetallic structure of an novel Al–Cu–Li alloy
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School of Materials Science and Engineering,Central South University,Central South University; 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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Research Foundation of the General Armament Department(6140506); Foundation for Sci & Tech Development Project of Sandong (No. 2014GGX102006)

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    摘要:

    分別采用金相,掃描電鏡,X射線衍射,電子探針和波譜分析的手段,對一種加入不同鈰(cerium)含量(0, 0.1, 0.3, and 0.5 wt.%)的新型Al-Cu-Li合金的鑄態(tài)微觀結(jié)構(gòu)進(jìn)行了研究。結(jié)果表明：隨著含鈰量的增加,晶粒得到很大程度的細(xì)化；在含鈰量不超過0.3wt.%的所有試驗(yàn)合金中,均觀察到了一種 Mg Ag富集的Al7Cu4Li中間相；當(dāng)含鈰量達(dá)到0.5wt.%,一種新型的灰色CuSi(AgMg)相出現(xiàn)；然而粗大的桿狀A(yù)l2CuLi相在含鈰量達(dá)到0.3wt%就已經(jīng)完全消失。分析表明：鈰添加導(dǎo)致本試驗(yàn)合金中的平衡相的析出序列和凝固行為發(fā)生了改變；同時(shí)分析發(fā)現(xiàn)在合金凝固過程中產(chǎn)生的一種先析Al8Cu4Ce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:

    In the present work, the microstructure evolution of a novel Al-Cu-Li alloy with rare earth cerium (Ce) additions (0, 0.1, 0.3, and 0.5 wt.%) were investigated. The as-cast samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron probe microanalysis (EPMA) with wavelength dispersive spectroscopic (WDS). The microstructural observation showed that the grains were significantly refined with increasing the addition contents of rare earth Ce. A Mg Ag-rich Al7Cu4Li intermetallic phase was observed in all experimental alloys except for the alloy with addition of 0.5wt.? that may be attributed to emerged an extra gray CuSi(AgMg) phase. Furthermore, the coarse rodlike Al2CuLi phase was completely absent with Ce level up to 0.3wt.%. The analysis shows that the Ce addition introduces changes in the precipitation sequence and consequently in the solidification behavior of the alloy. It can be deduced that the grain refinement is mainly the result of the primary Al8Cu4Ce promoting a (Al) nucleation and further prohibiting the grain growth for the cerium addition experimental alloys.

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余鑫祥,尹登峰,余志明,張亦然,李樹飛. Ce含量對新型Al-Cu-Li合金的凝固行為及其平衡相的影響[J].稀有金屬材料與工程,2016,45(6):1423~1429.[Yu Xinxiang, Yin Dengfeng, Yu Zhiming, Zhang Yiran, Li Shufei. Solidification behaviour and the effects of cerium on the intermetallic structure of an novel Al–Cu–Li alloy[J]. Rare Metal Materials and Engineering,2016,45(6):1423~1429.]
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  • 收稿日期:2015-01-08
  • 最后修改日期:2015-02-06
  • 錄用日期:2015-05-13
  • 在線發(fā)布日期: 2016-10-08
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