定向凝固生长速率对Al-15Cu合金组织演化的影响

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定向凝固生长速率对Al-15Cu合金组织演化的影响
Effects of Directional Solidification Growth Rate on Microstructure Evolution of Al-15Cu Alloy
2021年41卷第4期页码：498-501
纸质出版日期： 2021 ，
DOI： 10.15980/j.tzzz.2021.04.023

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[1]刘德志,黄蕾,赵性川,马杰,王长征,尹贻彬,黄宝旭.定向凝固生长速率对Al-15Cu合金组织演化的影响[J].特种铸造及有色合金,2021,41(04):498-501.

Liu Dezhi, Huang Lei, Zhao Xingchuan, et al. Effects of Directional Solidification Growth Rate on Microstructure Evolution of Al-15Cu Alloy[J]. Special Casting & Nonferrous Alloys, 2021,41(4):498-501.
[1]刘德志,黄蕾,赵性川,马杰,王长征,尹贻彬,黄宝旭.定向凝固生长速率对Al-15Cu合金组织演化的影响[J].特种铸造及有色合金,2021,41(04):498-501. DOI： 10.15980/j.tzzz.2021.04.023.

Liu Dezhi, Huang Lei, Zhao Xingchuan, et al. Effects of Directional Solidification Growth Rate on Microstructure Evolution of Al-15Cu Alloy[J]. Special Casting & Nonferrous Alloys, 2021,41(4):498-501. DOI： 10.15980/j.tzzz.2021.04.023.

通过定向凝固装置在10、20、50μm/s凝固速率下制备了Al-15Cu合金试样。在不同凝固速率下

溶质元素Cu在试样中的分布均符合Scheil方程。由于Cu密度较大

产生密度偏析

使得有效分配系数kE增大

且凝固速率越小

密度偏析越严重。凝固速率的增加或液相中溶质浓度的升高

一方面使得溶质元素Cu在固液界面处的富集程度升高

抑制了枝晶宽度的增加

细化了组织;另一方面促进了成分过冷

树枝晶特征更加显著。

Al-15Cu alloy samples were prepared by directional solidification device with solidification rates of 10

20 and 50μm/s.The distribution of solute element Cu conforms to Scheil equation under different solidification rates.Due to the high density of Cu

gravity segregation occurs

which makes the effective distribution coefficient kEincrease.With decreasing in the solidification rate

the gravity segregation becomes more serious.With the increase of the solidification rate or solute concentration in the liquid phase

the concentration of solute element Cu at the solid-liquid interface is increased

inhibiting the broadening of dendrite and refining the structure.Meanwhile

the component supercooling is promoted with the dendrite characteristics more obvious.

定向凝固Al-Cu合金Scheil方程凝固速率密度偏析

Directional SolidificationAl-Cu AlloyScheil EquationSolidification RateGravity Segregation

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