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稀土元素添加AZ91鎂合金非平衡凝固組織研究
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國(guó)家自然科學(xué)基金（51164028, 51261025）；江西省教育廳青年基金（GJJ12446）；輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室開(kāi)放課題（GF201201003）


Non-equilibrium Solidification Microstructure of AZ91 Magnesium Alloy Containing Rare Earth Elements
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    摘要:

    采用銅模噴鑄方式進(jìn)行了稀土元素添加AZ91鎂合金非平衡凝固實(shí)驗(yàn)，對(duì)比研究了稀土元素種類(lèi)（Re=Ce, Er）及含量（0.25%，0.5%，0.75%，1%，質(zhì)量分?jǐn)?shù)）對(duì)鎂合金晶粒尺寸、基體成分及相結(jié)構(gòu)的影響規(guī)律。結(jié)果表明，同等含量條件下，Ce元素在α-Mg中的固溶度更低，溶質(zhì)富集程度更明顯，易形成Al11Ce3高熔點(diǎn)化合物相，合金細(xì)化效果比Er更好。隨Ce含量增加，晶粒尺寸不斷減小，β-Mg17Al12共晶相數(shù)量減少，分布趨于彌散。當(dāng)Ce含量大于0.75%時(shí)，出現(xiàn)明顯的晶粒粗化現(xiàn)象。在此基礎(chǔ)上，從形核和生長(zhǎng)的角度對(duì)上述細(xì)化機(jī)理進(jìn)行了合理解釋?zhuān)⒗貌顭岱治鰧?shí)驗(yàn)進(jìn)行了有效驗(yàn)證。

    Abstract:

    Non-equilibrium solidification of AZ91 magnesium alloy containing RE elements was performed by a copper mould casting method, and the effects of category of RE (RE=Ce, Er) and its content (0.25, 0.5, 0.75, 1 wt%) on the primary grain size, solute concentration and phase structures were researched. Results show that less solute content exists in α-Mg grain for Ce addition, accompanied by the serious solute enrichment ahead of solid/liquid interface and the formation of Al11Ce3 phase with high melting point. Consequently, the refinement effect of Ce is more significant than that of Er. With increasing the amount of Ce, both the primary grain size and the ratio of β-Mg17Al12 phase decrease continuously, with the dispersive distribution of eutectic phase in the matrix. In contrast, grain coarsening appears when the Ce content is larger than 0.75 wt%. On this basis, the refinement mechanism was explained according to nucleation and growth processes, which was further verified by the differential thermal analysis experiment.

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楊 偉,張燕龍,余 歡,嚴(yán)青松,胡 嘯,楊根倉(cāng).稀土元素添加AZ91鎂合金非平衡凝固組織研究[J].稀有金屬材料與工程,2014,43(10):2402~2406.[Yang Wei, Zhang Yanlong, Yu Huan, Yan Qingsong, Hu Xiao, Yang Gencang. Non-equilibrium Solidification Microstructure of AZ91 Magnesium Alloy Containing Rare Earth Elements[J]. Rare Metal Materials and Engineering,2014,43(10):2402~2406.]
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  • 收稿日期:2013-10-15
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  • 在線發(fā)布日期: 2015-04-07
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