|Sudden transition from columnar to equiaxed grain of cast copper induced by rare earth microalloying|
|Chen, Yan; Zhang, Shihong; Song, Hongwu; Cheng, Ming; Li, Haihong; Liu, Jinsong; firstname.lastname@example.org
|Source Publication||MATERIALS & DESIGN
|Abstract||A sudden columnar-to-equiaxed transition (CET) of cast copper with rare earth (RE) microalloying has been examined. Some solidification parameters of Cu-La alloys were determined by using optical microscopy and differential scanning calorimetry, and simulation of temperature field in copper ingot solidification process. It is noted that the addition of RE microalloying can purify the alloy and make an interaction between equiaxed nucleation and constitutional undercooling, which results in a sudden CET. Furthermore, a new prediction model of the critical alloy composition condition for the CET induced by RE microalloying is established. The critical compositions of a sudden CET of cast copper with La addition is 0.14 wt.%, which is in good agreement with the experimental results. It is suggested that increasing the alloy content is very necessary at a high gradient in order to promote the CET. However, the number N-0 of effective nucleation sites should also be increased with the decrease of the alloy composition. Meanwhile, it can be found that the columnar region can be expanded with the increase of the temperature gradient. It is obvious that lowering temperature gradient contributes to promote the CET. The prediction model can also be used in the common CET very well. (C) 2015 Elsevier Ltd. All rights reserved.|
; zhang, shihong
; song, hongwu
; cheng, ming
; li, haihong
; liu, jinsong] chinese acad sci, inst met res, shenyang 110016, peoples r china
|Keyword||Sudden Columnar-to-equiaxed Transition
Rare Earth Microalloying
|Funding Organization||Science Foundation of The Chinese Academy of Sciences 
Chen, Yan,Zhang, Shihong,Song, Hongwu,et al. Sudden transition from columnar to equiaxed grain of cast copper induced by rare earth microalloying[J]. MATERIALS & DESIGN,2016,91:314-320.
Chen, Yan.,Zhang, Shihong.,Song, Hongwu.,Cheng, Ming.,Li, Haihong.,...&email@example.com.(2016).Sudden transition from columnar to equiaxed grain of cast copper induced by rare earth microalloying.MATERIALS & DESIGN,91,314-320.
Chen, Yan,et al."Sudden transition from columnar to equiaxed grain of cast copper induced by rare earth microalloying".MATERIALS & DESIGN 91(2016):314-320.
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