Microstructural Evolution and Mechanical Properties in Directionally Solidified Sn–10.2 Sb Peritectic Alloy at a Constant Temperature Gradient
Microstructural Evolution and Mechanical Properties in Directionally Solidified Sn–10.2 Sb Peritectic Alloy at a Constant Temperature Gradient
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DOI：
10.1590/1980-5373-mr-2015-0104
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发表时间：
2016-02
影响因子：
1.7
通讯作者：
E. Yılmaz;E. Çadırlı;Emine Acer;M. Gündüz
中科院分区：
文献类型：
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作者：
E. Yılmaz;E. Çadırlı;Emine Acer;M. Gündüz
采用真空熔炼炉和热装炉制备了Sn-10.2Sb（质量分数）包埋合金。在具有恒定温度梯度（G=4.5± 0.2K）的稳态条件下，样品向上定向凝固。mm ~（-1）生长速率（V=13.3-266.7 μm）下的生长曲线。s-1）在布里奇曼型定向凝固装置中进行。研究了生长速度对枝晶间距的影响。在直径为4 mm的圆柱形试样纵、横截面上测量了定向凝固Sn-10.2Sb合金中α相的一次枝晶臂间距（PDAS）。在纵截面上测量了二次枝晶臂间距（SDAS）。实验结果表明，随着生长速度的增加，测得的PDAS（λ 1 L，λ 1 T）和SDAS（λ2）减小。通过线性回归分析，确定了PDAS、SDAS、显微硬度（HV）和抗压强度（σc）与生长速度的关系。将实验结果与以往的实验结果和实验模型的结果进行了比较。
The Sn–10.2 Sb (mass fraction) peritectic alloy was prepared using a vacuum melting furnace and a hot filling furnace. The samples were directionally solidified upwards at steady state conditions with a constant temperature gradient (G=4.5±0.2 K. mm-1) under different growth velocities (V=13.3–266.7 µm. s-1) in a Bridgman-type directional solidification apparatus. The effects of the growth velocity (V) on the dendritic spacings were investigated. Primary dendrite arm spacing (PDAS) of α phase in directionally solidified Sn–10.2 Sb peritectic alloy was measured on the longitudinal and transverse sections of 4 mm diameter cylindrical samples. Secondary dendrite arm spacing (SDAS) was measured on the longitudinal section. The experimental results show that the measured PDAS (λ1L, λ1T) and SDAS (λ2) decrease with increasing growth velocity. The dependence of PDAS, SDAS, microhardness (HV) and compressive strength (σc) on the growth velocity were determined by using a linear regression analysis. The experimental results were compared with the previous experimental results and the results of the experimental models.