| 激光超高温度梯度快速凝固条件下Cu-Mn合金的组织演化规律 |
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| 引用本文： | 杨森,钟敏霖,张庆茂,黄卫东,刘文今,周尧和.激光超高温度梯度快速凝固条件下Cu-Mn合金的组织演化规律[J].航空材料学报,2001,21(2):1-5,13. |
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| 作者姓名： | 杨森 钟敏霖 张庆茂 黄卫东 刘文今 周尧和 |
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| 作者单位： | 1. 清华大学机械系,
2. 西北工业大学 |
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| 基金项目： | 国家自然科学基金(59771054),清华大学985重点资助项目 |
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| 摘 要： | 利用CWCO2激光器对Cu-26.6wt%Mn,Cu-27.3wt%Mn和Cu-31.4wt%Mn三种不同成分的合金进行了一系列表面熔凝实验,并对这三种合金的组织形态选择规律进行了研究.实验结果表明,重熔区组织较基体组织大大细化;随着生长速度的增大,Cu-26.6wt%Mn合金的组织由低速胞晶向枝晶、高速胞晶及完全无偏析固溶体转变.在所有凝固速度下Cu-27.3wt%Mn和Cu-31.4wt%Mn合金中没有枝晶组织出现,以全胞晶形式生长.三种合金达到绝对稳定的临界速度分别为113.3,212.6和260.5mm/s,与M-S理论预言的绝对稳定临界速度相吻合.
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| 关 键 词： | 激光快速凝固 伸长胞晶 绝对稳定性 超高温度梯度 |
| 文章编号： | 1005-5053(2001)02-0001-06 |
| 修稿时间： | 2001年4月20日 |
Microstructure evolution of Cu-Mn alloy under laser ultra-high temperature gradient and rapid solidification condition |
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| YANG Sen ,ZHONG Min lin ,ZHANG Qing mao ,HUANG Wei dong ,LIU Wen jin ,ZHOU Yao he.Microstructure evolution of Cu-Mn alloy under laser ultra-high temperature gradient and rapid solidification condition[J].Journal of Aeronautical Materials,2001,21(2):1-5,13. |
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| Authors: | YANG Sen ZHONG Min lin ZHANG Qing mao HUANG Wei dong LIU Wen jin ZHOU Yao he |
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| Institution: | YANG Sen 1,ZHONG Min lin 1,ZHANG Qing mao 1,HUANG Wei dong 2,LIU Wen jin 1,ZHOU Yao he 2 |
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| Abstract: | Laser rapid solidification experiments have been performed on Cu 26.6wt%Mn,Cu 27.3wt%Mn and Cu 31.4wt%Mn alloys to investigate their microstructures evolution with growth rate under ultra high temperature gradient, respectively. The experimental results showed that the microstructure of Cu 26.6wt%Mn alloy changed from cellular to dendrite, super fine cellular and segregation free solid with the increase of growth rate; no dendrite growth appeared in the whole growth rate range for Cu 27.3 wt%Mn and Cu 31.4wt%Mn alloy, whereas fully grew in the form of cellular. The critical rates of absolute stability for Cu 31.4 wt%Mn,Cu 27.3wt%Mn and Cu 26.6wt%Mn alloys were 113.3, 212.6 and 260.5mm/s, respectively, which is reasonable agreement with that of the predicted by M S theory. |
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| Keywords: | laser rapid solidification elongated cell absolute stability ultra high temperature gradient |
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