Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1638698 | Transactions of Nonferrous Metals Society of China | 2010 | 5 Pages |
Abstract
To develop AZ91D alloys with fine microstructure, effects of the addition of rare earth (RE), Sr and RE + Sr on the dendrite growth and phase precipitation in AZ91D magnesium alloy were studied, respectively. The results show that the microstructure is refined and the morphology of β-Mg17A112 phase is modified with RE or Sr addition, especially with the RE+Sr composite addition which can reduce the average grain size of AZ91D alloy obviously to 141 μm. The needle-like or block-like new phases adhering to β-Mg17A112 phase form at interdendrites during solidification. The enrichment of RE or/and Sr elements in front of the solidification interface, especially at the tips of α-Mg dendrite, which restricts the growth of α-Mg dendrite, changes the preferential growth of α-Mg and finally results in the grain refinement and the blunting of α-Mg dendrite.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Ji-xue ZHOU, Jie WANG, Jing WANG, Yuan-sheng YANG,