Dependency of microhardness on solidification processing parameters and microstructure characteristics in the directionally solidified Ti–46Al–0.5W–0.5Si alloy
Dependency of microhardness on solidification processing parameters and microstructure characteristics in the directionally solidified Ti–46Al–0.5W–0.5Si alloy
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DOI：
10.1016/j.jallcom.2010.05.095
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发表时间：
2010-08
影响因子：
6.2
通讯作者：
Jianglei Fan;Xinzhong Li;Yan-Qing Su;Jingjie Guo;H. Fu
中科院分区：
文献类型：
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作者：
Jianglei Fan;Xinzhong Li;Yan-Qing Su;Jingjie Guo;H. Fu
TiAl基合金(Ti–46Al–0.5W–0.5Si at.%)通过使用布里奇曼型定向凝固炉在恒定温度梯度(G=20K/mm)下以宽范围的生长速率(2–100μm/s)进行定向凝固。测量了枝晶间距（λ）、层状间距（λL）和显微硬度（HV）。 HV值随着生长速率（V）的增加而增加，并随着枝晶间距和层间距的增加而减小。 HV 对 V、λ 和 λL 的依赖性通过线性回归分析确定。 V与HV、λ与HV、λL与HV之间的关系分别为HV=794.7V0.15、HV=398.1λ-0.31和HV=491.5+53.4λL-0.5。将本工作中获得的拟合指数值与之前的类似实验结果进行了比较。
TiAl-based alloy (Ti–46Al–0.5W–0.5Si at.%) was directionally solidified at a constant temperature gradient (G=20K/mm) in a wide range of growth rates (2–100μm/s) by using a Bridgman type directional solidification furnace. The dendritic spacing (λ), lamellar spacing (λL) and microhardness (HV) were measured. The value of HVincreases with the increasing growth rate (V) and decreases with the increasing dendritic spacing and interlamellar spacing. The dependence of HVon V, λ and λLwas determined by linear regression analysis. The relationships between the V and HV, and λ and HV, and λLand HVwere given as HV=794.7V0.15, HV=398.1λ−0.31and HV=491.5+53.4λL−0.5, respectively. The fitted exponent values obtained in this work were compared with the previous similar experimental results.