纵向磁场对Al-40%Cu过共晶合金定向凝固显微组织的影响

doi:10.3724/SP.J.1037.2010.00588

金属学报

2011, Vol. 47

Issue (4): 417-422 DOI: 10.3724/SP.J.1037.2010.00588

论文

本期目录 | 过刊浏览

纵向磁场对Al-40%Cu过共晶合金定向凝固显微组织的影响

沈裕, 任忠鸣, 李喜, 任维丽

上海大学上海市现代冶金与材料制备重点实验室, 上海 200072

EFFECT OF LONGITUDINAL MAGNETIC FIELD ON THE MICROSTRUCTURE OF DIRECTIONALLY SOLIDIFIED Al-40%Cu HYPEREUTECTIC ALLOY

SHEN Yu, REN Zhongming, LI Xi, REN Weili

Shanghai Key Laboratory of Modern Metallurgy & Materials Processing, Shanghai University, Shanghai 200072

引用本文:

沈裕任忠鸣李喜任维丽. 纵向磁场对Al-40%Cu过共晶合金定向凝固显微组织的影响[J]. 金属学报, 2011, 47(4): 417-422.
, , , . EFFECT OF LONGITUDINAL MAGNETIC FIELD ON THE MICROSTRUCTURE OF DIRECTIONALLY SOLIDIFIED Al-40%Cu HYPEREUTECTIC ALLOY[J]. Acta Metall Sin, 2011, 47(4): 417-422.

全文: PDF(1016 KB)

摘要: 研究了纵向磁场对Al-40%Cu(质量分数)过共晶合金定向凝固显微组织的影响. 结果表明, 在温度梯度 G_L=42.6 K/cm, 生长速率 R=2 μm/s, 施加弱磁场时, Al₂Cu初生相由规则小平面状逐渐变得不规则, 并趋向于非小平面方式生长, 热电磁对流效应在不同尺度下影响界面前沿溶质分布及各相生长温度, 微观尺度下影响初生相形貌, 宏观尺度下改变糊状区长度, 引起宏观偏析; 施加较强磁场后, 初生相呈现不规则胞状组织并紧密定向排列, 这一现象主要归因于内生热电Lorentz力及磁晶各向异性.

关键词 ： Al-40%Cu合金, 定向凝固, 纵向磁场, 热电磁对流

Abstract：The microstructures of Al-40%Cu (mass fraction) hypereutectic alloy directionally solidified under a longitudinal magnetic field were investigated. The results show that the magnetic field has a great influence on the morphology of the primary Al₂Cu phase at the growth rate of R=2 μm/s and a temperature gradient of G_L=42.6 K/cm at the solid/liquid interface. The effect of thermoelectromagnetic convection (TEMC) which drives the fluid flow is predominant under low magnetic fields and different at different scales according to the model of TEMC established.
It is found that TEMC causes severe deformation of the primary Al₂Cu phase opposed to the well-aligned faceted
primary phase in the absence of the field at microscopic scale and the primary phase tends to become a
faceted-non-faceted transition gradually with the increase of the magnetic field. Moreover, TEMC modifies the
mushy zone length at macroscopic scale because of the secondary convection from the bulk caused by the microscopic
TEMC. TEMC also affects the solute distribution in the front of the interface at different scales and the process
of heat transfer. Under higher magnetic fields, the effect of TEMC is suppressed, however, the considerable
thermoelectric Lorentz force makes the primary phase become the irregular cellular structure. Meanwhile, the
primary phases align along the magnetic field closely, which results from the remarkable magnetocrystalline
anisotropy of the Al₂Cu crystal.

Key words： Al-40%Cu alloy directional solidification longitudinal magnetic field thermoelectromagnetic convection

收稿日期: 2010-11-03

ZTFLH:

TG111.4

基金资助:

国家自然科学基金项目50911130365和50701031, 上海市科学技术委员会项目09510700100, 08dj1400404, 10QA1402500和08DZ1130100, 以及长江学者创新团队发展计划项目IRT0739资助

作者简介: 沈裕, 男, 1987年生, 硕士生

	服务

	把本文推荐给朋友
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	沈裕
	任忠鸣
	李喜
	任维丽
44.8K

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00588 或 https://www.ams.org.cn/CN/Y2011/V47/I4/417

[1] Shercliff J A. J Fluid Mech, 1979; 91: 231

[2] Moreau R, Laskar O, Tanaka M, Camel D. Mater Sci Eng, 1993; A173: 93

[3] Lehmann P, Moreau R, Camel D, Bolcato R. Acta Mater, 1998; 46: 4067

[4] Yesilyurt S, Vujisic L, Motakef S, Szofran F R, Volz M P. J Cryst Growth, 1999; 207: 278

[5] Li X, Fautrelle Y, Ren Z M. Acta Mater, 2007; 55: 3803

[6] Li X, Gagnoud A, Ren Z M, Fautrelle Y, Moreau R. Acta Mater, 2009; 57: 2180

[7] Yilmaz F, Elliott R. J Cryst Growth, 1984; 66: 465

[8] Li X, Ren Z M, Fautrelle Y. Acta Mater, 2006; 54: 5349

[9] Jin F W. PhD Thesis, Shanghai University, 2007

(晋芳伟. 上海大学博士学位论文, 2007)

[10] Moreau R. Magnetohydrodynamics. Dordrecht: Kluwer Academic Publishers, 1990: 111

[11] Robertson G D, O’Connor D. J Cryst Growth, 1986; 76: 100

[12] Kishida Y, Takeda K, Miyoshino I, Taleuchi E. ISIJ Int, 1990; 30: 34

[13] Laskar O. PhD Thesis, Laboratoire MADYLAM, France, 1994

[14] Callen H B. Phys Rev, 1984; 73: 1349

[15] Li X, Ren Z M, Fautrelle Y, Zhang Y D, Esling C. Mater Lett, 2010; 64: 2597

[1]	马德新, 赵运兴, 徐维台, 王富. 重力对高温合金定向凝固组织的影响[J]. 金属学报, 2023, 59(9): 1279-1290.
[2]	张健, 王莉, 谢光, 王栋, 申健, 卢玉章, 黄亚奇, 李亚微. 镍基单晶高温合金的研发进展[J]. 金属学报, 2023, 59(9): 1109-1124.
[3]	苏震奇, 张丛江, 袁笑坦, 胡兴金, 芦可可, 任维丽, 丁彪, 郑天祥, 沈喆, 钟云波, 王晖, 王秋良. 纵向静磁场下单晶高温合金定向凝固籽晶回熔界面杂晶的形成与演化[J]. 金属学报, 2023, 59(12): 1568-1580.
[4]	李彦强, 赵九洲, 江鸿翔, 何杰. Pb-Al合金定向凝固组织形成过程[J]. 金属学报, 2022, 58(8): 1072-1082.
[5]	陈瑞润, 陈德志, 王琪, 王墅, 周哲丞, 丁宏升, 傅恒志. Nb-Si基超高温合金及其定向凝固工艺的研究进展[J]. 金属学报, 2021, 57(9): 1141-1154.
[6]	张小丽, 冯丽, 杨彦红, 周亦胄, 刘贵群. 二次枝晶取向对镍基高温合金晶粒竞争生长行为的影响[J]. 金属学报, 2020, 56(7): 969-978.
[7]	许庆彦,杨聪,闫学伟,柳百成. 高温合金涡轮叶片定向凝固过程数值模拟研究进展[J]. 金属学报, 2019, 55(9): 1175-1184.
[8]	张健,王莉,王栋,谢光,卢玉章,申健,楼琅洪. 镍基单晶高温合金的研发进展[J]. 金属学报, 2019, 55(9): 1077-1094.
[9]	唐文书,肖俊峰,李永君,张炯,高斯峰,南晴. 再热恢复处理对蠕变损伤定向凝固高温合金γ′相的影响[J]. 金属学报, 2019, 55(5): 601-610.
[10]	方辉,薛桦,汤倩玉,张庆宇,潘诗琰,朱鸣芳. 定向凝固糊状区枝晶粗化和二次臂迁移的实验和模拟[J]. 金属学报, 2019, 55(5): 664-672.
[11]	杨燕, 杨光昱, 罗时峰, 肖磊, 介万奇. Mg-14.61Gd合金的定向凝固组织及生长取向[J]. 金属学报, 2019, 55(2): 202-212.
[12]	金浩, 贾清, 刘荣华, 线全刚, 崔玉友, 徐东生, 杨锐. 籽晶制备及Ti-47Al合金PST晶体取向控制[J]. 金属学报, 2019, 55(12): 1519-1526.
[13]	吴国华, 陈玉狮, 丁文江. 高性能镁合金凝固组织控制研究现状与展望[J]. 金属学报, 2018, 54(5): 637-646.
[14]	王锦程, 郭春文, 李俊杰, 王志军. 定向凝固晶粒竞争生长的研究进展[J]. 金属学报, 2018, 54(5): 657-668.
[15]	陈光, 郑功, 祁志祥, 张锦鹏, 李沛, 成家林, 张中武. 受控凝固及其应用研究进展[J]. 金属学报, 2018, 54(5): 669-681.

Viewed

Full text

Abstract

Cited

Shared

Discussed