Dependence of microhardness on solidification processing parameters and dendritic spacing in directionally solidified Sn–Ni peritectic alloys
Dependence of microhardness on solidification processing parameters and dendritic spacing in directionally solidified Sn–Ni peritectic alloys
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DOI：
10.1016/j.jallcom.2014.08.150
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发表时间：
2015-01
影响因子：
6.2
通讯作者：
P. Peng;Xinzhong Li;Yan-Qing Su;Jiangong Li;Jingjie Guo;H. Fu
中科院分区：
文献类型：
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作者：
P. Peng;Xinzhong Li;Yan-Qing Su;Jiangong Li;Jingjie Guo;H. Fu
采用Bridgman型定向凝固炉对Sn-Ni包晶合金进行定向凝固。测定了初生ni3sn2相和包晶ni3sn4相的显微硬度（Hv）以及初生枝晶臂间距λ1等微观组织长度随生长速率的变化规律。定向凝固Sn-36合金的显微硬度与凝固工艺参数和初生枝晶臂间距（λ1）的关系。对%Ni合金进行了实验分析。通过线性回归分析得到了凝固工艺参数（生长速率和温度梯度g）与显微硬度、初生枝晶间距和显微硬度之间的关系：初生ni3sn2相Hv= 501.06v0.07,Hv= 5896.3λ1−0.42；对于包晶ni3sn4相，Hv= 306.76v0.10,Hv= 843.6λ1−0.69。结果表明，在恒定tg条件下，λ1随v的增大而减小，而显微硬度（Hv）随生长速率增大。
Sn–Ni peritectic alloys were directionally solidified using a Bridgman type directional solidification furnace. Microhardness (Hv) of both primary Ni3Sn2phase and peritectic Ni3Sn4phase and microstructure length scales including primary dendrite arm spacingλ1were measured as a function of growth rate. Dependency of microhardness on the solidification processing parameters and primary dendrite arm spacing (λ1) in the directionally solidified Sn–36 at.%Ni alloys were experimentally analyzed. The relationships between the solidification processing parameters (growth ratevand temperature gradientG) and microhardness, and primary dendrite arm spacing and microhardness were obtained by linear regression analysis: for primary Ni3Sn2phase,Hv= 501.06v0.07,Hv= 5896.3λ1−0.42; for peritectic Ni3Sn4phase,Hv= 306.76v0.10,Hv= 843.6λ1−0.69. It has been found that the values ofλ1decreases with the increasing values ofvwhile the values of microhardness (Hv) increase with growth rate under constantG.