Al-Si和Al-Si-Sc合金晶体-熔体界面能的各向异性
发布时间：2019-03-04 21:22
【摘要】：平衡液滴法(equilibrium shape measurement)是一种确定晶体-熔体界面能各向异性参数的有效方法。利用平衡液滴法测量单相固体中夹带的平衡液滴的形状,得到了Al-Si和Al-Si-Sc合金的界面能各向异性参数计算值。通过定向凝固方法制备Al-2%Si和Al-2%Si-0.2%Sc(质量分数,下同)合金杆状试样,使用光学显微镜表征Al-2%Si和Al-2%Si-0.2%Sc合金内部液滴手工连续磨样抛光后多个二维截面形状,计算了二维界面能各向异性参数的大小。利用聚焦离子束(focused ion beam,FIB)技术连续切割了Al-2%Si合金内部液滴,并用Image-J软件重构液滴三维形状,获得了三维界面能各向异性参数值(ε_1=0.0795,ε_2= 0.0056),并且绘制了三维界面能分布和界面刚度的分布图。在此基础上,讨论了平衡温度和Sc元素对界面能各向异性参数的影响。结果表明,对于Al-Si合金,平衡温度为595℃时液滴成分为Al-10.12%Si,金属液中的初生α-Al具有大小为0.0202的界面能各向异性值,而对于Al-Si-Sc合金,平衡温度为595℃时液滴成分为Al-10.08%Si-0.11%Sc(质量分数),金属液中的初生α-Al具有大小为0.0193的界面能各向异性值。
[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 伪-Al in Al-10.12%Si, metal solution has an interface energy anisotropy value of 0.0202 at equilibrium temperature of 595 鈩，
本文编号：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 伪-Al in Al-10.12%Si, metal solution has an interface energy anisotropy value of 0.0202 at equilibrium temperature of 595 鈩，
本文编号：2434647
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