| Microstructure evolution of laser rapidly solidified Al-Mn alloys |
| |
| 作者姓名： | YANG Sen HUANG Weidong LIU Wenjin ZHOU Yaohe |
| |
| 作者单位： | Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;Department of Materials Science and Engineering, Inner Mongolia Polytechnic University, Hohhot 010062, China,State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China） ,Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China,State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China |
| |
| 基金项目： | Supported by the National Natural Science Foundation of China (Grant No.59771054), Postdoctoral Science Foundation of China, and Postdoctoral Science Foundation of Tsinghua-Zhongda. |
| |
| 摘 要： | A series of laser surface remelting experiments of Al-1.1, 3.2 and 5.6 wt% Mn alloys has been conducted using a 5 kW CW CO2 laser, and the microstructures of samples have also been investigated. The experimental results show that no apparent eutectic growth appears in the whole growth rate range for Al-3.2 wt% Mn alloy under laser rapid solidification condition, and the microstructure grows in the form of α(Al) cell/dendrite. With the increase of growth rate, the microstructures of Al-5.6wt%Mn alloy change from Al6Mn dendrite to α(Al) +Al6Mn eutectic, α(Al) cellular/dendrite and segregation-free solid solution. The critical rates of Al-1.1, 3.2 and 5.6 wt% Mn alloys to attain absolute stability are 44.1, 134.6 and 230.1 mm/s respectively, and a reasonable agreement has been found between the experimental results and those calculated according to Mullins-Sekerka's theory.
|
| 关 键 词： | laser rapid solidification Al-Mn alloys absolute stability |
Microstructure evolution of laser rapidly solidified Al-Mn alloys |
| |
| YANG Sen,HUANG Weidong,LIU Wenjin,ZHOU Yaohe.Microstructure evolution of laser rapidly solidified Al-Mn alloys[J].Progress in Natural Science,2002,12(9):684-688. |
| |
| Authors: | YANG Sen HUANG Weidong Liu Wenjin ZHOU Yaohe |
| |
| Abstract: | A series of laser surface remelting experiments of Al-1.1, 3.2 and 5.6 wt% Mn alloys has been conducted using a 5 kW CW CO2 laser, and the microstructures of samples have also been investigated. The experimental results show that no apparent eutectic growth appears in the whole growth rate range for Al-3.2 wt% Mn alloy under laser rapid solidification condition, and the microstructure grows in the form of α(Al) cell/dendrite. With the increase of growth rate, the microstructures of Al-5.6wt%Mn alloy change from Al6Mn dendrite to α(Al) +Al6Mn eutectic, α(Al) cellular/dendrite and segregation-free solid solution. The critical rates of Al-1.1, 3.2 and 5.6 wt% Mn alloys to attain absolute stability are 44.1, 134.6 and 230.1 mm/s respectively, and a reasonable agreement has been found between the experimental results and those calculated according to Mullins-Sekerka's theory. |
| |
| Keywords: | laser rapid solidification Al-Mn alloys absolute stability |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《自然科学进展(英文版)》浏览原始摘要信息 |
| 点击此处可从《自然科学进展(英文版)》下载免费的PDF全文 |
|
