Al-Si和Al-Si-Sc合金晶體-熔體界面能的各向異性
發(fā)布時間：2019-03-04 21:22
【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。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)計算值。通過定向凝固方法制備Al-2%Si和Al-2%Si-0.2%Sc(質(zhì)量分?jǐn)?shù),下同)合金桿狀試樣,使用光學(xué)顯微鏡表征Al-2%Si和Al-2%Si-0.2%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,計算了二維界面能各向異性參數(shù)的大小。利用聚焦離子束(focused ion beam,FIB)技術(shù)連續(xù)切割了Al-2%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(ε_1=0.0795,ε_2= 0.0056),并且繪制了三維界面能分布和界面剛度的分布圖。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。結(jié)果表明,對于Al-Si合金,平衡溫度為595℃時液滴成分為Al-10.12%Si,金屬液中的初生α-Al具有大小為0.0202的界面能各向異性值,而對于Al-Si-Sc合金,平衡溫度為595℃時液滴成分為Al-10.08%Si-0.11%Sc(質(zhì)量分?jǐn)?shù)),金屬液中的初生α-Al具有大小為0.0193的界面能各向異性值。
[Abstract]:Equilibrium drop method (equilibrium shape measurement) is an effective method to determine the anisotropy parameters of crystal-melt interface energy. The equilibrium droplet method was used to measure the shape of equilibrium droplets in single-phase solids. The calculated values of interface energy anisotropy parameters of Al-Si and Al-Si-Sc alloys were obtained. The rod specimens of Al-2%Si and Al-2%Si-0.2%Sc (mass fraction) alloy were prepared by directional solidification method. Several two-dimensional cross-section shapes of Al-2%Si and Al-2%Si-0.2%Sc alloy after manual continuous grinding and polishing were characterized by optical microscope, and the anisotropy parameters of the two-dimensional interface energy were calculated. The internal droplets of Al-2%Si alloy were continuously cut by focused ion beam (focused ion beam,FIB) technique, and the three-dimensional shape of droplets was reconstructed by Image-J software, and the three-dimensional interface energy anisotropy parameters (蔚 _ 1, 0.0795, 0.0795, P < 0.01) were obtained. 蔚 _ 2 = 0.0056), and the three-dimensional distribution of interface energy and interface stiffness is plotted. On this basis, the effects of equilibrium temperature and Sc elements on the anisotropy parameters of interface energy are discussed. The results show that, for Al-Si alloy, the initial 偽-Al in Al-10.12%Si, metal solution has an interface energy anisotropy value of 0.0202 at equilibrium temperature of 595 鈩，
本文編號：2434647
[Abstract]:Equilibrium drop method (equilibrium shape measurement) is an effective method to determine the anisotropy parameters of crystal-melt interface energy. The equilibrium droplet method was used to measure the shape of equilibrium droplets in single-phase solids. The calculated values of interface energy anisotropy parameters of Al-Si and Al-Si-Sc alloys were obtained. The rod specimens of Al-2%Si and Al-2%Si-0.2%Sc (mass fraction) alloy were prepared by directional solidification method. Several two-dimensional cross-section shapes of Al-2%Si and Al-2%Si-0.2%Sc alloy after manual continuous grinding and polishing were characterized by optical microscope, and the anisotropy parameters of the two-dimensional interface energy were calculated. The internal droplets of Al-2%Si alloy were continuously cut by focused ion beam (focused ion beam,FIB) technique, and the three-dimensional shape of droplets was reconstructed by Image-J software, and the three-dimensional interface energy anisotropy parameters (蔚 _ 1, 0.0795, 0.0795, P < 0.01) were obtained. 蔚 _ 2 = 0.0056), and the three-dimensional distribution of interface energy and interface stiffness is plotted. On this basis, the effects of equilibrium temperature and Sc elements on the anisotropy parameters of interface energy are discussed. The results show that, for Al-Si alloy, the initial 偽-Al in Al-10.12%Si, metal solution has an interface energy anisotropy value of 0.0202 at equilibrium temperature of 595 鈩，
本文編號：2434647
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