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Al-Cu-Li合金均勻化處理參數(shù)優(yōu)化和微觀組織演化
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北京有色金屬研究總院,北京有色金屬研究總院,北京有色金屬研究總院,北京有色金屬研究總院,北京有色金屬研究總院,北京有色金屬研究總院

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Homogenization treatment parameter optimization and microstructural evolution of Al-Cu-Li alloy
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General Research Institute for Nonferrous Metals,General Research Institute for Nonferrous Metals,General Research Institute for Nonferrous Metals,General Research Institute for Nonferrous Metals,General Research Institute for Nonferrous Metals,General Research Institute for Nonferrous Metals

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    摘 要：對(duì)Al-Cu-Li鑄態(tài)合金進(jìn)行單級(jí)和雙級(jí)均勻化處理，通過(guò)光學(xué)顯微鏡（OM）、掃描電鏡（SEM）、能譜分析（EDS）、X衍射（XRD）和差熱分析（DSC）研究合金元素分布和微觀組織演化，結(jié)果表明：Al-Cu-Li合金鑄態(tài)組織存在嚴(yán)重枝晶偏析，由晶內(nèi)到晶界Cu元素分布十分不均勻，Mg、Zn、Mn和Ag變化不明顯。晶界處存在大量的非平衡共晶相，主要包括Al2Cu、含有少量Mg元素的Al2Cu相，以及Al2CuMg相。經(jīng)雙級(jí)均勻化（495℃×24h 515℃×24h）處理后，大部分非平衡共晶相和部分第二相（Al2CuMg和Al2CuLi）溶解到合金基體，但仍有部分富-Fe和富-Mn相殘留在晶界不能回溶。Al2CuMg相的熔點(diǎn)低于Al2Cu相，兩者分別在495℃和515℃先后溶解。通過(guò)均勻化動(dòng)力學(xué)分析，確定Al-Cu-Li鋁鋰合金最佳的均勻化制度為495℃×24h 515℃×24h，該雙級(jí)均勻化制度與動(dòng)力學(xué)分析結(jié)果一致。

    Abstract:

    Abstract: The microstructure evolution and composition distribution of the industrially cast Al-Cu-Li alloy during single-step and tow-step homogenization were investigated in detail by means of optical microscopy(OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD) and differential scanning calorimetry (DSC).The results show that severe dendrite segregation exists in the Al-Cu-Li as-cast alloy. Cu distribute unevenly from the grain boundary to inside. But the change of Mg, Zn, Mn and Ag are not obvious. In the grain boundary, there are distributed a large number of coarse nonequilibrium eutectic phases Al2Cu, Al2Cu dissolved a small amount of Mg and Al2CuMg phase. After?optimized two-step?homogenization treatment, most of the nonequilibrium?eutectic?phase and second phase(Al2CuMg and Al2CuLi)?dissolved?into ɑ(Al) matrix. A small amount of Fe-rich and Mn-rich phase are still distributed at the grain boundaries. Al2CuMg phase melting point lower than?the melting point of Al2Cu phase. Al2CuMg and Al2Cu phase gradually dissolved into matrix at 495℃ and 515℃, respectively. The suitable homogenization treatment for the Al-Cu-Li alloy is 495℃×24h 515℃×24h. The results of homogenization can be described by homogenization kinetic analysis, which agrees well with experimental observation.

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楊勝利,沈健,閆曉東,李錫武,張飛,孫寶慶. Al-Cu-Li合金均勻化處理參數(shù)優(yōu)化和微觀組織演化[J].稀有金屬材料與工程,2017,46(1):28~34.[yang sheng li, shen jian, yan xiao dong, lixiwu, zhangfei, sun bao qing. Homogenization treatment parameter optimization and microstructural evolution of Al-Cu-Li alloy[J]. Rare Metal Materials and Engineering,2017,46(1):28~34.]
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  • 收稿日期:2014-09-30
  • 最后修改日期:2014-11-03
  • 錄用日期:2015-01-13
  • 在線發(fā)布日期: 2017-03-16
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