<strong>AZ31</strong>镁合金拉伸扭折带结构的产生及交互作用机制

doi:10.11900/0412.1961.2019.00149

金属学报

2019, Vol. 55

Issue (12): 1512-1518 DOI: 10.11900/0412.1961.2019.00149

研究论文

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AZ31镁合金拉伸扭折带结构的产生及交互作用机制

周博^1,²,隋曼龄^1,²(

)

1. 北京工业大学固体微结构与性能研究所北京 100124
2. 北京工业大学固体微结构与性能北京市重点实验室北京 100124

Generation and Interaction Mechanism of Tension Kink Band in AZ31 Magnesium Alloy

ZHOU Bo^1,²,SUI Manling^1,²(

)

1. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, China
2. Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, China

引用本文:

周博, 隋曼龄. AZ31镁合金拉伸扭折带结构的产生及交互作用机制[J]. 金属学报, 2019, 55(12): 1512-1518.
ZHOU Bo, SUI Manling. Generation and Interaction Mechanism of Tension Kink Band in AZ31 Magnesium Alloy[J]. Acta Metall Sin, 2019, 55(12): 1512-1518.

全文: PDF(9253 KB) HTML

摘要:

利用TEM结合SAED花样，对室温轧制变形AZ31镁合金中拉伸扭折带结构及交互作用的形貌和晶体学特征进行了系统的研究。在镁合金塑性变形过程中，当外力不利于常见的孪晶形成及位错滑移时，扭折带作为一种补充的变形方式可以继续协调hcp结构的拉压不对称特性，对材料宏观塑性有着重要的影响。结果显示，hcp结构在与基面呈小角度的拉应力作用下，会形成基面位错对，并向相反方向运动，进而形成以{10 $1 ˉ$ 2}晶面为界面的拉伸扭折带。拉伸扭折带界面与基体基面的夹角约为43°。位错在不同变形结构的交互作用过程中起到了非常重要的作用，通过位错的作用可以调节变形结构的形态及晶体学取向，进一步提升材料的塑性。

关键词 ：镁合金, 扭折带, 形变孪晶, 透射电镜

Abstract：

The deformation structures, such as deformation twins, dislocations and kink bands, play an important role in the plasticity of magnesium alloys during the deformation process. However, due to the complexity of hcp structure, the deformation structures of the magnesium alloys, especially the interactions between deformation structures are still not well understood. Thus, it is of great scientific significance to study the microstructure of magnesium alloys, especially to characterize their structural characteristics of the interaction areas, which plays a significant role in understanding the structure and performance relationships of magnesium alloys. In this work, a combination of TEM and SAED pattern was applied to study the interaction mechanism associated with different kinds of deformation structures in Mg-Al-Zn (AZ31) alloy. When the applied external force is not beneficial for deformation twins and dislocations, kink bands act as a supplementary deformation mode to coordinate the asymmetry of hcp structure. According to crystallographic analysis, it is found that under the action of tensile stress nearly lie on basal plane in hcp structures, the basal dislocation pairs form and move to the opposite directions, forming tension kink band with the interface of {10 $1 ˉ$ 2} plane. The angle between the tension kink band interface and the basal plane is about 43°. The tension kink bands can further contribute to the strength and toughness of the material. These results will open a new insight into the understanding of interaction mechanism of deformation structures and greatly promote the development of Mg alloys.

Key words： Mg alloy kink band deformation twins TEM

收稿日期: 2019-05-07

ZTFLH:

TG146.22

基金资助:国家自然科学基金项目(Nos.11374028);国家自然科学基金项目(U1330112);国家自然科学基金项目(51621003);北京市教委重点科研项目(No.KZ201310005002);北京市科技创新-高精尖学科建设项目(No.PXM2019_014204_500031)

作者简介: 周博，男，1988年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00149 或 https://www.ams.org.cn/CN/Y2019/V55/I12/1512

图1 样品制备方法

图2 高密度扭折带区域的TEM像

图3 扭折带交互作用区域的TEM分析

图4 {101ˉ1}<101ˉ2ˉ>孪晶与扭折带交互作用的TEM分析

图5 拉伸扭折带形成机理示意图

图6 拉伸扭折带与{101ˉ1}孪晶交互作用机理示意图

Deformation structure	Force direction	Slip plane	Slip direction	Schmid factor
(10 $1 ˉ$ 1) twin	[ $2 ˉ$ 111]	(10 $1 ˉ$ 1)	[10 $1 ˉ$ $2 ˉ$ ]	0.349
(10 $1 ˉ$ $1 ˉ$ ) twin	[ $2 ˉ$ 111]	(10 $1 ˉ$ $1 ˉ$ )	[10 $1 ˉ$ 2]	-0.056
Kink band	[ $2 ˉ$ 111]	(0001)	[1 $2 ˉ$ 10]	0.209

表1 不同变形结构在外力作用下的Schmid因子

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