往复挤压纯镁的组织演变和力学性能

doi:10.11901/1005.3093.2014.600

材料研究学报

2015, Vol. 29

Issue (8): 569-575 DOI: 10.11901/1005.3093.2014.600

本期目录 | 过刊浏览

往复挤压纯镁的组织演变和力学性能

董婷婷^1,²,王渠东^1,²(

),郭炜^1,²,刘鉴锋^1,²,蒋海燕^1,²

1. 上海交通大学轻合金精密成型国家工程研究中心上海 200240
2. 上海交通大学金属基复合材料国家重点实验室上海 200240

Microstructure and Mechanical Property of Pure Magnesium Processed by Cyclic Extrusion Compression

Tingting DONG^1,²,Qudong WANG^1,^2,^**(

),Wei GUO^1,²,Jianfeng LIU^1,²,Haiyan JIANG^1,²

1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China
2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China

引用本文:

董婷婷,王渠东,郭炜,刘鉴锋,蒋海燕. 往复挤压纯镁的组织演变和力学性能[J]. 材料研究学报, 2015, 29(8): 569-575.
Tingting DONG, Qudong WANG, Wei GUO, Jianfeng LIU, Haiyan JIANG. Microstructure and Mechanical Property of Pure Magnesium Processed by Cyclic Extrusion Compression[J]. Chinese Journal of Materials Research, 2015, 29(8): 569-575.

全文: PDF(4336 KB) HTML

摘要:

研究了纯镁在350℃往复挤压2, 4, 8道次, 以及在250℃, 350℃, 450℃往复挤压2道次的组织和力学性能的变化规律。结果表明, 纯镁经350℃往复挤压后, 组织显著细化, 挤压道次从2增加到8时, 晶粒尺寸无明显变化, 而屈服强度下降, 延伸率提高。通过电子背散射衍射技术(EBSD)发现纯镁在350℃往复挤压2, 4, 8道次后, 形成{0001}基面与挤压方向分别约成25°, 30°, 40°夹角的织构, 且织构强度增加, 基面滑移系的Schmid因子上升。纯镁在250℃, 350℃, 450℃往复挤压2道次后, 随着挤压温度下降, 晶粒尺寸减小, 屈服强度上升, 屈服强度和晶粒尺寸之间的关系可表述为。

关键词 ：金属材料, 纯镁, 往复挤压, 微观组织, 力学性能, 织构, 晶粒尺寸

Abstract：

Microstructure and tensile property of pure magnesium processed by cyclic extrusion-compression (CEC) at 350℃ for 2, 4 and 8 passes respectively, as well as for 2 passes at 250℃, 350℃ and 450℃ respectively are investigated. Results showed that the microstructure of pure magnesium is significantly refined and recrystallized after CEC for 2 passes at 350℃. With the increase of passes, the grain sizes of CECed pure magnesium showed no obvious differences. It was found by means of electron backscatter diffraction (EBSD) analysis that a texture with the basal plane of grains inclining 20o -40o to the extrusion direction developed during the CEC processing. With the increase of CEC passes, the maximum intensity of the texture and Schmid factor of basal slip system increased. Compare to that for 2 passes, the yield stress of pure magnesium after CEC for 8 passes at 350℃ decreases from 60 MPa to 41 MPa, and the elongation increases from 8% to 16.7%. The yield stress and grain size of the pure Mg processed by CEC for 2 passes at 250℃, 350℃and 450℃ follows the Hall-Petch relationship, which can be described as .

Key words： metallic materials pure magnesium cyclic extrusion compression microstructure mechanical property texture grain size

收稿日期: 2014-10-20

基金资助:* 国家自然科学基金(51074106, 51374145,51404151), 中国博士后科学基金2014M561466, 上海市博士后科研资助计划14R21411000资助项目及上海市科学技术委员会资助项目09JC1408200。

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图1 往复挤压工艺示意图

图2 取样位置示意图

图3 纯镁铸态组织

图4 纯镁在350℃往复挤压后的显微组织

图5 纯镁往复挤压2道次显微组织

图6 纯镁经350℃往复挤压后的{0001}, 10 1 ? 0 and 10 1 ? 1 极图

图7 纯镁经350℃往复挤压后晶粒位相角统计图

图8 纯镁350℃往复挤压后的力学性能

图9 纯镁在不同温度下往复挤压2道次后的力学性能

图10 纯镁往复挤压后屈服强度与晶粒尺寸的关系

图11 350℃纯镁往复挤压后力学性能和织构的最大极密度的关系

图12 350℃往复挤压后纯镁的Schmid因子

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