定向凝固Al-38.5%Cu合金中带状组织的形成机理
Band Structure Formation Mechanism in Directionally Solidified Al-38.5%Cu Alloy
摘 要
在温度梯度为260 K·cm-1和凝固速率为1 μm·s-1条件下,对Al-38.5%Cu合金凝固组织中存在的Al2Cu单相和Al/Al2Cu共晶相交替生长带状组织的形成机理进行了研究.结果表明:带状组织的产生与合金定向凝固界面前沿的溶质分布有关,形成的原因是合金未达到稳态凝固,凝固速率和合金成分一直处于变化之中;在单相和共晶相的带状组织中,合金凝固速率在单相中随着界面前液相溶质含量的增加而逐渐减小,而在共晶相中随着界面前沿液相溶质含量的增加而逐渐增大.
定向凝固
带状组织
溶质分布
Al-38.5%Cu alloy
directional solidification
band structure
solute distribution
Abstract
The formation mechanism of the band structure formed during the alternative growth of single phase Al2Cu and eutectic phase Al/Al2Cu in solidified microstructure of Al-38.5% Cu alloy was studied when the growth rate was 1 μm·s-1 and the temperature gradient was 260 K·cm-1 in liquid.The results show that the formation of band structure was related to the solute distribution ahead of solid-liquid interface due to the changes of the growth rate and alloy composition during directional solidification.With the increase of the liquid solute content of the single phase,the solidification rate of the alloy decreased,but in the growth of coupled eutectic phase the solidification rate increased.
中图分类号 TG146.4
所属栏目 试验研究
基金项目
收稿日期 2008/11/21
修改稿日期 2009/7/18
网络出版日期
作者单位点击查看
备注唐玲(1979-),女,陕西汉中人,讲师,硕士.
引用该论文: TANG Ling,LI Shuang-ming,AI Tao-tao,LI Wen-hu,FENG Xiao-ming. Band Structure Formation Mechanism in Directionally Solidified Al-38.5%Cu Alloy[J]. Materials for mechancial engineering, 2010, 34(4): 31～34
唐玲,李双明,艾桃桃,李文虎,冯小明. 定向凝固Al-38.5%Cu合金中带状组织的形成机理[J]. 机械工程材料, 2010, 34(4): 31～34
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参考文献
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【3】TRIVEDI R,MASON J T,VERHOEVEN J D,et al.Eutectic spacing selection in lead-based alloy systems[J].Metall Trans,1991,22A:2523-2533.
【4】TRIVEDI R,MAGNIN P,KURZ W.Theory of eutectic growth under rapid solidification conditions[J].Acta Metall,1987,35(4):971-980.
【5】李双明,刘林,李晓历.包晶合金定向凝固平界面前沿的形核分析[J].金属学报,2004,40(1):20-26.
【6】李新中,郭景杰,苏彦庆.定向凝固包晶合金带状组织的形成机制及相选择 I.带状组织的形成机制[J].金属学报,2005,41(6):593-598.
【7】郭景杰,李新中,苏彦庆.定向凝固包晶合金带状组织的形成机制及相选择 II.相选择[J].金属学报,2005,41(6):599-604.
【8】KRAFT R W,ALBRIGHT D L.Microstructure of unidirectionally solidified Al-CuAl2 eutectic[J].Trans of the Metallurgical Society of Aime,1961,221:95-101.
【9】刘安生.二元合金状态图集[M].北京,冶金工业出版社,2004:29.
【10】LEE J H,LIU Shan,TRIVEDI R.The effect of fluid flow on eutectic growth[J].Metall Mater Trans A,2005,36:3111-3125.
【11】HAN S H,TRIVEDI R.Banded microsturctures formation in off-eutectic alloys[J].Metall Mater Trans A,2000,31:1819.
【12】WARREN J A,LANGER J S.Effect of the composition on microstructure and mechanical properities of Ti-Al binary alloys[J].Phys Rev E,1993,47:2702-2712.
【13】MOLLARD F R.Growth of composites from the melt-partⅠ[J].Trans Metall Soc,1967,239:1526-1533.
【14】MOLLARD F R.Growth of composites from the melt-partⅡ[J].Trans Metall Soc,1967,239:1534-1546.
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