高压扭转大塑性变形Al–Mg合金中的晶界结构*

doi:10.11901/1005.3093.2013.724

材料研究学报

2014, Vol. 28

Issue (5): 371-379 DOI: 10.11901/1005.3093.2013.724

本期目录 | 过刊浏览

高压扭转大塑性变形Al–Mg合金中的晶界结构*

蒋婷慧¹,刘满平¹(

),谢学锋¹,王俊¹,吴振杰¹,刘强¹,Hans J. Roven²

1. 江苏大学材料科学与工程学院江苏省高端结构材料重点实验室镇江 212013
2. 挪威科技大学(NTNU)材料科学与工程学院特隆赫姆7491 挪威

Grain Boundary Structure of Al–Mg Alloys Processed by High Pressure Torsion

Tinghui JIANG¹,Manping LIU^1,^**(

),Xuefeng XIE¹,Jun WANG¹,Zhenjie WU¹,Qiang LIU¹,J. Roven Hans²

1. School of Materials Science and Engineering, Jiangsu Province Key Laboratory of High-end Structural Materials, Jiangsu University, Zhenjiang 212013
2. Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway

引用本文:

蒋婷慧,刘满平,谢学锋,王俊,吴振杰,刘强,Hans J. Roven. 高压扭转大塑性变形Al–Mg合金中的晶界结构*[J]. 材料研究学报, 2014, 28(5): 371-379.
Tinghui JIANG, Manping LIU, Xuefeng XIE, Jun WANG, Zhenjie WU, Qiang LIU, J. Roven Hans. Grain Boundary Structure of Al–Mg Alloys Processed by High Pressure Torsion[J]. Chinese Journal of Materials Research, 2014, 28(5): 371-379.

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摘要:

利用透射电镜和高分辨透射电镜(HRTEM)研究了高压扭转大塑性变形纳米结构Al–Mg合金中的位错和晶界结构。结果表明: 对尺寸小于100 nm的晶粒, 晶内无位错, 其晶界清晰平直; 而尺寸大于200 nm的大晶粒通常由几个亚晶或位错胞结构组成, 局部位错密度可高达10¹⁷m^-2, 这些位错往往以位错偶和位错环的形式出现。用HRTEM观察到了小角度及大角度非平衡晶界、小角度平衡晶界和大角度Σ9平衡晶界等不同的晶界结构。基于实验结果, 分析了局部高密度位错、位错胞和非平衡晶界等在晶粒细化过程中的作用, 提出了高压扭转Al–Mg合金的晶粒细化机制。

关键词 ：金属材料, 高压扭转, 大塑性变形, 铝合金, 晶界结构, 非平衡晶界, 位错

Abstract：

The structure of dislocation and grain boundary (GB) in nanostructured Al–Mg alloys processed by high pressure torsion (HPT) was characterized by means of transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). The results show that the grains less than 100 nm have sharp GBs and are completely free of dislocations. In contrast, a high density of dislocation as high as 10¹⁷m^-2exists within the grains larger than 200 nm and these larger grains are usually separated into subgrains and dislocation cells. These dislocations appear as dipoles and loops. Different GB structures including low/high angle non-equilibrium GBs, low angle equilibrium GBs and high angle Σ 9 equilibrium boundaries are characterized by HRTEM. The roles of the very high local dislocation density, the dislocation cells and the non-equilibrium GBs in grain refinement during HPT are analyzed and the refinement mechanisms associated with these structural features have been proposed.

Key words： metal materials high pressure torsion severe plastic deformation aluminium alloys grain boundary structure non-equilibrium grain boundary dislocation

收稿日期: 2013-09-30

基金资助:* 国家自然科学基金50971087,江苏省自然科学基金BK2012715, 江苏大学高级人才启动基金11JDG070 & 11JDG140, 江苏省高端结构材料重点实验室资金hsm1301 和江苏省材料摩擦学重点实验室基金Kjsmcx2011004 资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.724 或 https://www.cjmr.org/CN/Y2014/V28/I5/371

图1 高压扭转Al–Mg合金中典型晶粒的TEM像

图2 高压扭转Al–0.5Mg合金300 nm较大晶粒中位错的HRTEM像

图3 高压扭转Al–Mg合金中20 nm小晶粒的HRTEM图像

图4 高压扭转Al–Mg合金中小角度平衡晶界的HRTEM图像

图5 高压扭转Al–Mg合金中小角度非平衡晶界的HRTEM图像

图6 高压扭转Al–Mg合金中大角度非平衡晶界的HRTEM图像

图7 高压扭转Al–Mg合金中Σ9大角度晶界的HRTEM图像

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