热轧态LT24铝合金溶质原子的偏聚规律*

doi:10.11901/1005.3093.2014.260

材料研究学报

2014, Vol. 28

Issue (12): 919-924 DOI: 10.11901/1005.3093.2014.260

本期目录 | 过刊浏览

热轧态LT24铝合金溶质原子的偏聚规律*

李慧^1,³(

),汪波^1,^4sup1,夏爽²,周邦新²,苏诚³,丁文炎³,谌炎松³

1. 上海大学微结构重点实验室上海 200444
2. 上海大学材料研究所上海 200072
3. 浙江久立特材科技股份有限公司湖州 313000
4. 贵阳职业技术学院贵阳 550081

Segregation of Solute Atoms in Hot Rolled Aluminum Alloy LT24

Hui LI^1,^3,^**(

),Bo WANG^1,⁴,Wenqing LIU¹,Shuang XIA²,Bangxin ZHOU²,Cheng SU³,Wenyan DING³,Yansong CHEN³

1. Key Laboratory for Microstructures, Shanghai University, Shanghai 200444
2. Institute of Materials, Shanghai University, Shanghai 200072
3. Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou 313000
4. Guiyang Vocational and Technical College, Guiyang 550081

引用本文:

李慧,汪波,夏爽,周邦新,苏诚,丁文炎,谌炎松. 热轧态LT24铝合金溶质原子的偏聚规律*[J]. 材料研究学报, 2014, 28(12): 919-924.
Hui LI, Bo WANG, Wenqing LIU, Shuang XIA, Bangxin ZHOU, Cheng SU, Wenyan DING, Yansong CHEN. Segregation of Solute Atoms in Hot Rolled Aluminum Alloy LT24[J]. Chinese Journal of Materials Research, 2014, 28(12): 919-924.

全文: PDF(3467 KB) HTML

摘要:

采用原子探针层析技术(APT)等测试手段分析了LT24铝合金热轧后合金元素的偏聚规律。结果表明: 热轧态铝合金晶粒内部有成分为Al_0.5Mg(Si_0.7Cu_0.3)的析出相, 析出相与基体之间的界面处没有元素偏聚。溶质原子Mg、Si、Cu在晶界处偏聚, 在晶界处的偏聚规律与晶粒内部的相反, Cu的偏聚倾向远大于Si和Mg, 晶界处Cu的含量达到基体Cu含量的45倍左右。基于实验结果, 讨论了合金元素偏聚的规律及其对材料性能的影响。

关键词 ：金属材料, 铝合金, 偏聚, 析出, 晶界, 原子探针层析技术

Abstract：

The segregation of solute atoms in hot rolled LT24 aluminum alloy was investigated by atom probe tomography. The results show that a precipitate with composition of Al_0.5Mg(Si_0.7Cu_0.3) can be observed in the grains. No solute segregation can be observed at the interface between precipitates and the matrix. However solute atoms, such as Mg, Si and Cu all tend to segregate at grain boundaries, but the segregation tendency of Cu is much stronger than that of Mg and Si. The concentration of Cu at grain boundaries is 45 times of that at the matrix. Based on the experimental results, the feature of solute segregation and its effect on the performance of the alloy are discussed.

Key words： metallic materials aluminum alloy segregation precipitates grain boundary atom probe tomography

收稿日期: 2014-05-20

基金资助:* 国家自然科学基金51301103, 中国博士后科学基金2013M541507, 上海市科学技术委员会重点项目12JC1404000和上海大学创新基金资助项目。

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	李慧
	汪波
	夏爽
	周邦新
	苏诚
	丁文炎
	谌炎松

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链接本文:

https://www.cjmr.org/CN/10.11901/1005.3093.2014.260 或 https://www.cjmr.org/CN/Y2014/V28/I12/919

图1 实验用样品的金相照片

图2 样品晶粒内部Mg、Si、Cu原子的三维空间分布图

图3 垂直穿越析出相附近的一维成分分布曲线

图4 平行于和垂直于晶界面观察样品中晶界处Mg、Si、Cu的三维空间分布图

图5 垂直穿越晶界附近Mg、Si、Cu的一维成分分布曲线(虚线位置为晶界位置)和积累成分曲线

表1 不同溶质原子在晶界处的富集指数(Sav)和Gibbs界面超量Γ(×1018/m2)

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