采用 Al-(3．4—15)%Bi(质量分数)难混溶合金进行了快速连续凝固实验,研究了 Bi 含量和凝固速率对快速连续凝固组织的影响．结果表明,少量富 Bi 相粒子尺寸随着 Bi 含量的增加而增大,提高凝固速率有助于制备少量富 Bi 相粒子均匀分布的...采用 Al-(3．4—15)%Bi(质量分数)难混溶合金进行了快速连续凝固实验,研究了 Bi 含量和凝固速率对快速连续凝固组织的影响．结果表明,少量富 Bi 相粒子尺寸随着 Bi 含量的增加而增大,提高凝固速率有助于制备少量富 Bi 相粒子均匀分布的难混溶合金．通过分析富 Bi 粒子尺寸分布,发现沿试样轴向和径向方向粒子平均直径变化不大,试样表层处粒子尺寸较小．研究表明,快速连续凝固是制备均质难混溶合金的有效途径．展开更多
Pure copper rods containing continuous columnar crystals were fabricatedusing the downward CUS (Continuous Unidirectional Solidification) equipment. When the technologicalparameters were set as the ranges of mould tem...Pure copper rods containing continuous columnar crystals were fabricatedusing the downward CUS (Continuous Unidirectional Solidification) equipment. When the technologicalparameters were set as the ranges of mould temperature 1100-1300℃, cooling distance (the distancefrom the exit of the cast mould to the start point of cooling) 10-20 mm, casting speed 0.2-2.5 mm/s,cooling water (20-25℃) volume 1000-1320 L/h, and when these parameters matched reasonably, the CUSprocess was performed stably, and pure copper rods containing continuous columnar crystals withbright and smooth surface were produced. The dendritic arm spacing of the crystals in copper rodsdecreased with increasing the casting speed. The results of the texture by X-ray diffractionanalysis showed that the rods has strong <100> fiber texture.展开更多
文摘采用 Al-(3．4—15)%Bi(质量分数)难混溶合金进行了快速连续凝固实验,研究了 Bi 含量和凝固速率对快速连续凝固组织的影响．结果表明,少量富 Bi 相粒子尺寸随着 Bi 含量的增加而增大,提高凝固速率有助于制备少量富 Bi 相粒子均匀分布的难混溶合金．通过分析富 Bi 粒子尺寸分布,发现沿试样轴向和径向方向粒子平均直径变化不大,试样表层处粒子尺寸较小．研究表明,快速连续凝固是制备均质难混溶合金的有效途径．
基金This work was financially supported by the Major State Basic Research Project of China (G2000067206) and the National Science Fund for Distinguished Young Scientists of China (No.50125415).
文摘Pure copper rods containing continuous columnar crystals were fabricatedusing the downward CUS (Continuous Unidirectional Solidification) equipment. When the technologicalparameters were set as the ranges of mould temperature 1100-1300℃, cooling distance (the distancefrom the exit of the cast mould to the start point of cooling) 10-20 mm, casting speed 0.2-2.5 mm/s,cooling water (20-25℃) volume 1000-1320 L/h, and when these parameters matched reasonably, the CUSprocess was performed stably, and pure copper rods containing continuous columnar crystals withbright and smooth surface were produced. The dendritic arm spacing of the crystals in copper rodsdecreased with increasing the casting speed. The results of the texture by X-ray diffractionanalysis showed that the rods has strong <100> fiber texture.
