| 深过冷Cu-37.4%Pb偏晶合金凝固行为和微观组织 |
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| 引用本文： | 郝维新,杨根仓,谢辉. 深过冷Cu-37.4%Pb偏晶合金凝固行为和微观组织[J]. 铸造技术, 2004, 25(2): 105-107 |
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| 作者姓名： | 郝维新 杨根仓 谢辉 |
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| 作者单位： | 西北工业大学凝固技术国家重点实验室,陕西,西安,710072 |
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| 基金项目： | 国家自然科学基金，航空科研项目，陕西省自然科学基金 |
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| 摘 要： | 用熔融玻璃净化与循环过热相结合的方法,研究Cu-37.4%Pb偏晶合金过冷熔体凝固组织的演化规律和熔体过冷度及形核率对相分离的影响.研究表明:对于偏晶合金,当过冷度<150 K时,由于初生相L2的长大被抑制,形成Pb分布在α枝晶间的均匀凝固组织;当过冷度>150 K时,随着过冷度的增大,由于Ostward熟化和凝并的加强,L2液滴尺寸增加,导致L2的液相分离,凝固组织中的Pb颗粒尺寸经历由小变大的过程,直至发生分层.
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| 关 键 词： | Cu-Pb偏晶合金 深过冷 枝晶生长 |
| 文章编号： | 1000-8365(2004)02-0105-03 |
| 修稿时间： | 2003-10-17 |
Solidification Behavior and Microstructure of Highly Undercooled Cu-37.4%Pb Monotectic Alloy |
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| HAO Wei-xin,YANG Gen-cang,XIE Hui. Solidification Behavior and Microstructure of Highly Undercooled Cu-37.4%Pb Monotectic Alloy[J]. Foundry Technology, 2004, 25(2): 105-107 |
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| Authors: | HAO Wei-xin YANG Gen-cang XIE Hui |
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| Abstract: | The microstructure evolution patterns and the phases separation of Cu-37.4%Pb monotectic(mass percentage) alloy caused by undercooling and nucleation have been investigated with glass fluxing technique combined with cycling processes of superheating and cooling. It indicates due to the growth of primary phase _L_2_ restrained, the microstructure with Pb distributed in interdendritic spacing is formed within undercooling less than 150 K; because of the enhancement of Ostward ripening and congregation, the increasing of Pb droplets dimension bring on the course which Pb lumps largen gradually until sedimentating to the sample bottom in the solidification microstructure with the increase of undercooling when undercooling exceeds 150 K. |
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| Keywords: | Cu-Pb monotectic alloy High undercooling Dendrite growth |
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