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硼化物、富Ce混合稀土對再生Al-Si合金中富鐵相變質(zhì)行為的研究
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1.重慶大學(xué) 材料科學(xué)與工程學(xué)院;2.重慶大學(xué) 材料學(xué)院;3.重慶大學(xué),材料學(xué)院

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9C省部產(chǎn)學(xué)研結(jié)合重大專項項目-汽車輕量化構(gòu)件精益鑄造關(guān)鍵技術(shù)及產(chǎn)業(yè)化集群示范(項目號2012A090300016);山東省自主創(chuàng)新專項計劃項目(項目號20126301)


Effects of borides and Ce-rich Mischmetal on the modification of Fe-rich intermetallics in secondary Al-Si alloys
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College of Material Science and Engineering, Chongqing University

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    摘要:

    本文研究了硼化物、富Ce混合稀土對再生Al-Si合金富鐵相變質(zhì)行為的影響。采用光學(xué)顯微鏡(OM)、掃描電鏡(SEM)對試樣微觀組織進行形貌觀察,采用X射線衍射儀分析儀(XRD)、掃描電鏡附帶的能譜儀(EDS)分別對試樣進行相分析與相成分分析,利用差分掃描量熱儀(DSC)研究相轉(zhuǎn)變溫度。研究表明硼化物可以促進針狀β-Fe相向初生α-Fe相轉(zhuǎn)變,且初生α-Fe相尺寸隨著硼化物的添加量增加而增大,當硼化物(KBF4)添加量達到1.0%時,開始析出漢字狀α-Fe相,漢字狀α-Fe相以初生α-Fe相為基底形核并長大;富Ce混合稀土可以抑制初生α-Fe相長大,且能抑制漢字狀α-Fe相生成

    Abstract:

    Effects of borides and Ce-Rich mischmetal on the modification of Fe-rich intermetallics in secondary Al-Si alloys are studied in this paper.Microstructure morphology is observed by optical microscope(OM) and scanning electric microscope(SEM) , phases and compositions of phases are analyzed by X-ray diffraction(XRD)and energy dispersive X-ray (EDS) respectively.Phase transition temperature is measured by differential scanning calorimeter(DSC).It is indicated that borides can prompt transformation from needle-like β-Fe phase to primary α-Fe phase. And the size of primary α-Fe phase increases with the addition of borides. When the borides(KBF4)reaches 1.0%, Chinese script-type α-Fe phase begins to precipitate. Nucleation of Chinese script-type α-Fe phase are based on primary α-Fe phase. Ce-rich mischmetal can inhibit the growth of the primary α-Fe phase and the formation of Chinese script-type α-Fe phase.

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楊懷德,龍思遠,朱姝晴,范超,楊承志.硼化物、富Ce混合稀土對再生Al-Si合金中富鐵相變質(zhì)行為的研究[J].稀有金屬材料與工程,2016,45(1):187~191.[yang huai de, long si yuan, zhu shu qing, fan chao, yang cheng zhi. Effects of borides and Ce-rich Mischmetal on the modification of Fe-rich intermetallics in secondary Al-Si alloys[J]. Rare Metal Materials and Engineering,2016,45(1):187~191.]
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  • 收稿日期:2014-01-21
  • 最后修改日期:2014-02-17
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  • 在線發(fā)布日期: 2019-01-04
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