標題: The Influence of Aluminum Content of AZ61 and AZ80 Magnesium Alloys on Hot Cracking
作者: Huang, C. J.
Cheng, C. M.
Chou, C. P.
機械工程學系
Department of Mechanical Engineering
關鍵字: AZ61;AZ80;Cracking;GTAW;Mg17Al12
公開日期: 2011
摘要: This study aims to investigate how aluminum content in magnesium alloys AZ61 and AZ80 impacts the hot cracking susceptibility of magnesium alloys. Differences in aluminum content are known to influence the total crack length of hot cracking. Magnesium alloy AZ61's total crack length was the longest in one thermal cycle, while AZ80's total crack length increased as the number of thermal cycles increased. The most significant difference between AZ61 and AZ80 was the hot crack at the heat-affected zone (HAZ). As the number of heat inputs increased, the grain would coarsen in the HAZ and precipitation started, which resulted in the accumulation of hot cracks at weld metal HAZ (W. M. HAZ). During the solidification of AZ80, which has higher aluminum content, the segregation of aluminum at the grain boundary caused Mg17Al12 to liquefy, increasing the length of hot cracks. Augmented strain caused miniature cracks between Mg17Al12 and grains. Therefore, aluminum content and augmented strain were found causes of hot cracking susceptibility in magnesium alloys.
URI: http://hdl.handle.net/11536/15388
http://dx.doi.org/10.1080/10426914.2010.536936
ISSN: 1042-6914
DOI: 10.1080/10426914.2010.536936
期刊: MATERIALS AND MANUFACTURING PROCESSES
Volume: 26
Issue: 9
起始頁: 1179
結束頁: 1187
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