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Al-Si和Al-Si-Sc合金的界面能各向異性的研究
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北京科技大學(xué)材料科學(xué)與工程學(xué)院,北京科技大學(xué)新金屬材料國家重點(diǎn)實(shí)驗(yàn)室,北京科技大學(xué)材料科學(xué)與工程學(xué)院

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Study on anisotropy of crystal-melt interfacial energy for Al-Si and Al-Si-Sc alloys
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School of Materials Science and Engineering,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,School of Materials Science and Engineering,University of Science and Technology Beijing

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    摘要:

    平衡液滴法(Equilibrium shape measurement)是一種確定晶體-熔體界面能各向異性參數(shù)的有效方法。本文利用平衡液滴法測量單相固體中夾帶的平衡液滴的形狀,得到了Al-Si和Al-Si-Sc合金的界面能各向異性參數(shù)計(jì)算值。通過定向凝固方法制備Al-2wt.%Si和Al-2wt.%Si-0.2wt.%Sc合金桿狀試樣,使用光學(xué)顯微鏡表征Al-2wt.%Si和Al-2wt.%Si-0.2wt.%Sc合金內(nèi)部液滴手工連續(xù)磨樣拋光后多個二維截面形狀,計(jì)算了二維界面能各向異性參數(shù)的大小。利用FIB(Focused ion beam)技術(shù)連續(xù)切割了Al-2wt.%Si合金內(nèi)部液滴,并用Image-J軟件重構(gòu)液滴三維形狀,獲得了三維界面能各向異性參數(shù)值以及三維界面能分布和界面剛度的分布。在此基礎(chǔ)上,討論了平衡溫度和Sc元素對界面能各向異性參數(shù)的影響。

    Abstract:

    The equilibrium shape measurement (ES) has been proved to be an effective method to determine the anisotropy of crystal-melt interfacial energy. In this paper, ES method is utilized to measure the shape of liquid droplets entrained in single-phase solid, and to calculate anisotropy parameters for Al-Si and Al-Si-Sc alloys. Rod-shaped Al-2wt.%Si and Al-2wt.%Si-0.2wt.%Sc alloy specimens are produced using the directional solidification process, followed by heat treatment and quenching. Specimens are sectioned normal to the <100> direction. Optical microscopy is used to characterize 2-D droplet shapes obtained by using sequential grinding for Al-2wt.%Si and Al-2wt.%Si-0.2wt.%Sc alloys, and then anisotropy parameters of interfacial energy were calculated. 3-D morphologies of droplets sliced by using focused ion beam (FIB) for Al-2wt.%Si alloy were reconstructed with Image-J software. Anisotropy parameters of interfacial energy were calculated and the 3-D interfacial energy and interfacial stiffness were plotted by using Matlab software. Effect of equilibrium temperature and Sc element on anisotropy parameters of interfacial energy were discussed for Al-Si alloys.

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王濤,陳曉華,王自東. Al-Si和Al-Si-Sc合金的界面能各向異性的研究[J].稀有金屬材料與工程,2017,46(6):1566~1571.[Wang Tao, Chen Xiaohua, Wang Zidong. Study on anisotropy of crystal-melt interfacial energy for Al-Si and Al-Si-Sc alloys[J]. Rare Metal Materials and Engineering,2017,46(6):1566~1571.]
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  • 收稿日期:2016-09-29
  • 最后修改日期:2016-12-15
  • 錄用日期:2017-01-06
  • 在線發(fā)布日期: 2017-11-07
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