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金属学报  2010, Vol. 46 Issue (12): 1495-1500    DOI: 10.3724/SP.J.1037.2010.00230
  论文 本期目录 | 过刊浏览 |
Al-Al4C3细化剂和超声场对纯Mg组织的影响
高声远,乐启炽,张志强,崔建忠
东北大学材料电磁过程研究教育部重点实验室, 沈阳 110819
EFFECTS OF Al–Al4C3 REFINER AND ULTRASONIC FIELD ON MICROSTRUCTURES OF PURE Mg
GAO Shengyuan, LE Qichi, ZHANG Zhiqiang, CUI Jianzhong
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819
引用本文:

高声远 乐启炽 张志强 崔建忠. Al-Al4C3细化剂和超声场对纯Mg组织的影响[J]. 金属学报, 2010, 46(12): 1495-1500.
, , , . EFFECTS OF Al–Al4C3 REFINER AND ULTRASONIC FIELD ON MICROSTRUCTURES OF PURE Mg[J]. Acta Metall Sin, 2010, 46(12): 1495-1500.

全文: PDF(3260 KB)  
摘要: 在不同Al-Al4C3细化剂添加量条件下, 对纯Mg熔体进行孕育处理. 当添加质量分数为1.0%Al-Al4C3细化剂时细化效果最佳, α-Mg晶粒平均尺寸由毫米级降至106 μm. 在纯Mg熔体中施加不同功率超声场, 当施振功率为600 W时细化效果最好. 研究表明, 空化泡破碎产生的过冷对形核具有促进作用, 空化泡的破裂及声流对熔体的搅动使得细小枝晶破碎, 形成新的结晶核心, 这一过程对形核起主要作用. 功率超声与Al-Al4C3细化剂共同作用于纯Mg熔体过程, 可以显著细化晶粒. 其机理为超声对杂质的“活化”作用.
关键词 超声场纯MgAl4C3晶粒细化    
Abstract:The melt of pure Mg was inoculated at the conditions of different addition amounts of Al–Al4C3 refiner. When adding 1.0%Al–Al4C3  refiner, the refining effect is the best and the average grain size of α–Mg is reduced from millimeter level to 106 μm. Ultrasound fields with different power levels were applied on the melt of pure magnesium and the best refining effect was obtained when the power was 600 W. The results show that the undercooling formed by breakdown of cavitation bubbles may have a promoting effect to nucleate. The breakdown of cavitation bubbles and the agitations of acoustic stream on the melt cause the fragmentation of fine dendritic crystal which could form new crystallization nuclei, this process plays the main role for nucleating in the melt. The combined application of ultrasound and Al–Al4C3  refiner to the melt of pure Mg could significantly refine its grain. The mechanism would be an the activation effect of ultrasound on the impurities in the melt.
Key wordsultrasound field    pure Mg    Al4C3    grain rfinement
收稿日期: 2010-05-13     
ZTFLH: 

TG146.2

 
基金资助:

国家重点基础研究发展计划项目2007CB613701和2007CB-613702, 国家自然科学基金项目50904018, 50974037和51004032, 中央高校基本科研业务费专项资金项目90409002和90209002, 教育部新世纪优秀人才支持计划项目NCET--08--0098以及中国博士后科学基金项目20100471648资助

作者简介: 高声远, 男, 1983年生, 博士生
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