异步轧制AZ31镁合金板材的超塑性工艺及变形机制

doi:10.11868/j.issn.1001-4381.2015.08.002

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摘要

经过异步轧制工艺获得AZ31镁合金薄板。在300~450℃范围内,分别通过5×10^-3,1×10^-3s^-1和5×10^-4s^-1不同应变速率进行高温拉伸实验研究其超塑性变形行为,计算应变速率敏感指数m值、超塑性变形激活能Q及门槛应力σ₀值。通过EBSD分析和扫描电镜观察拉伸断裂后的断口形貌,分析AZ31镁合金的超塑性变形机制。结果表明:AZ31镁合金的塑性变形能力随着变形温度的升高及应变速率的降低而增强。当拉伸温度为400℃、m=0.72、应变速率为5×10^-4s^-1时,AZ31具有良好的超塑性,伸长率最大为206%。温度为400℃时,异步轧制AZ31镁合金的超塑性变形是以晶格扩散控制的晶界滑移和基面滑移共同完成的。

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	江海涛
	段晓鸽
	蔡正旭
	王丹

关键词 ： AZ31镁合金, 晶粒细化, 超塑性工艺, 变形机制

Abstract：

AZ31 magnesium alloy sheet was prepared by asynchronous rolling process. From 300℃ to 450℃, tensile test was conducted with different strain rates of 5×10^-3, 1×10^-3s^-1 and 5×10^-4s^-1 respectively to investigate the superplastic deformation behavior of AZ31 magnesium alloy. The value of the strain rate sensitive index m, the superplastic deformation activation energy Q and the threshold stress σ₀were also calculated. The superplastic deformation mechanism of AZ31 was investigated through observation of the fracture morphology of the tensile specimens by EBSD and SEM.The results show that the plastic deformation capacity of AZ31 magnesium alloy enhances with increasing deformation temperature and decreasing strain rate. AZ31 magnesium alloy exhibits good superplasticity, and maximum elongation-to-failure of 206% at 400℃ when the strain rate is 5×10^-4s^-1, and the m value is 0.72. Furthermore, the superplastic deformation of the asynchronous rolled AZ31 magnesium alloy at 400℃ relies on the joint effects of grain boundary sliding (GBS) controlled by lattice diffusion and basal slip.

Key words： AZ31 magnesium alloy grain refinement superplastic process deformation mechanism

收稿日期: 2013-09-17 出版日期: 2015-08-17

基金资助:国家科技支撑计划课题资助项目(2011BAE22B03)

通讯作者: 江海涛 E-mail: nwpujht@163.com

作者简介: 江海涛(1976-),男,副教授,从事有色金属加工、汽车用钢方面的研究工作,联系地址:北京科技大学冶金工程研究院(100083),E-mail:nwpujht@163.com

引用本文:

江海涛, 段晓鸽, 蔡正旭, 王丹. 异步轧制AZ31镁合金板材的超塑性工艺及变形机制[J]. 材料工程, 2015, 43(8): 7-12.
Hai-tao JIANG, Xiao-ge DUAN, Zheng-xu CAI, Dan WANG. Superplastic Process and Deformation Mechanism of Asymmetrically Rolled AZ31 Magnesium Alloy. Journal of Materials Engineering, 2015, 43(8): 7-12.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.08.002 或 http://jme.biam.ac.cn/CN/Y2015/V43/I8/7

Table 1 AZ31镁合金的化学成分(质量分数/%)

Fig.1 AZ31镁合金异步轧制退火后的显微组织
(a)及晶粒尺寸的正态分布统计图(b)

Fig.2 AZ31镁合金的应力-位移曲线
(a)ε=1×10^-3s^-1；(b)T=450℃

Fig.3 AZ31镁合金超塑变形前后的宏观形貌
(a)变形前；(b)变形后(T=400℃,ε=5×10^-4s^-1，δ=206%)

Fig.4 温度和应变速率对AZ31镁合金伸长率的影响

Fig.5 不同温度下AZ31镁合金的ln-lnσ曲线

Table 2 AZ31镁合金不同温度下的应力指数n值与门槛应力σ₀值

Fig.6 AZ31镁合金的取向成像分析
(a),(b)异步轧制退火后的取向成像图及{0001}面极图;(c),(d)400℃、5×10^-4s^-1拉伸后取向成像图及{0001}面极图

Fig.7 AZ31镁合金在400℃、5×10^-4s^-1拉伸下的断口形貌

1	MORDIKE B L, EBERT T Magnesium properties-applications-potential[J]. Materials Science and Engineering: A, 2001, 302 (1): 37- 45.
2	LUO A A, MISHRA R K, POWELL B R, et al Magnesium alloy development for automotive applications[J]. Materials Science Forum, 2012, 706 (1): 69- 82.
3	刘旭贺. 超轻超塑性镁锂合金的制备及性能研究[D]. 哈尔滨: 哈尔滨工程大学, 2012.
3	LIU Xu-he. Study on preparation and properties of superlight-superplastic Mg-Li alloy[D]. Harbin: Harbin Engineering University, 2012.
4	WATANABE H Mechanical properties and texture of superplastically deformed AZ31 magnesium alloy[J]. Materials Science and Engineering: A, 2008, 477 (1-2): 153- 161.
5	BLANDIN J J Superplastic forming of magnesium alloys: production of microstructures, superplastic properties, cavitation behavior[J]. Superplasticity in Advanced Materials, 2007, 551-552, 211- 217.
6	陈维平, 杨冬雨, 詹美燕累积叠轧焊温度和循环道次对 AZ31 镁合金组织和性能的影响[J]. 特种铸造及有色合金, 2008, 28 (5): 338- 341.
6	CHEN Wei-ping, YANG Dong-yu, ZHAN Mei-yan Effects of rolling temperature and cycle numbers on the microstructure and properties of AZ31 magnesium sheet during accumulative rolling-bonding[J]. Special Casting & Nonferrous Alloys, 2008, 28 (5): 338- 341.
7	FIGUEIREDO R B, LANGDON T G Grain refinement and mechanical behavior of a magnesium alloy processed by ECAP[J]. Journal of Materials Science, 2010, 45 (17): 4827- 4836.
8	徐淑波, 秦振, 刘婷, 等剧烈塑性变形对AZ31镁合金显微组织和力学性能的影响[J]. 中国有色金属学报: 英文版, 2012, 22 (Suppl1): 61- 67.
8	XU Shu-bo, QIN Zhen, LIU Ting, et al Effect of severe plastic deformation on microstructure and mechanical properties of bulk AZ31 magnesium alloy[J]. Transactions of Nonferrous Metals Society of China, 2012, 22 (Suppl1): 61- 67.
9	张凯锋, 尹德良, 王国峰, 等热轧AZ31镁合金超塑性变形中的微观组织演变及断裂行为[J]. 航空材料学报, 2005, 25 (1): 5- 10.
9	ZHANG Kai-feng, YIN De-liang, WANG Guo-feng, et al Microstructure evolution and fracture behavior in superplastic deformation of hot-rolled AZ31 Mg alloy[J]. Journal of Aeronautical Materials, 2005, 25 (1): 5- 10.
10	张诗昌, 田甜, 韦中新, 等 AZ31镁合金超塑性及其变形机制图[J]. 特种铸造及有色合金, 2009, 29 (8): 695- 697.
10	ZHANG Shi-chang, TIAN Tian, WEI Zhong-xin, et al Superplasticity and deformation mechanism map of AZ31 magnesium alloy[J]. Special Casting & Nonferrous Alloys, 2009, 29 (8): 695- 697.
11	HOSOKAWA H, IWASAKI H, MORI T Effects of Si on deformation behavior and cavitation of coarse-grained Al-4[J]. 5Mg alloys exhibiting large elongation[J]. Acta Mater, 1999, 47 (6): 1859- 1867.
12	王赛香, 张大童, 张文, 等热轧MB8镁合金的超塑性[J]. 材料热处理学报, 2012, 33 (9): 17- 22.
12	WANG Sai-xiang, ZHANG Da-tong, ZHANG Wen, et al Superplasticity of hot rolled MB8 magnesium alloy[J]. Transactions of Materials and Heat Treatment, 2012, 33 (9): 17- 22.
13	陈晓霞, 唐伟能, 陈荣石粗晶 Mg-3Gd-1Zn 合金高温压缩变形过程中的动态再结晶[J]. 稀有金属, 2012, 36 (1): 6- 12.
13	CHEN Xiao-xia, TANG Wei-neng, CHEN Rong-shi Dynamic recrystallization of coarse-grained Mg-3Gd-1Zn alloy during hot-compression[J]. Chinese Journal of Rare Metals, 2012, 36 (1): 6- 12.
14	MOHANMED F A On the origin of super plastic flow at very low stress[J]. Materials Science and Engineering: A, 2005, 410-411, 89- 94.
15	陈浦泉. 组织超塑性[M]. 哈尔滨: 哈尔滨工业大学出版社, 1988.
15	CHEN Pu-quan. Structural Superplasticity[M]. Harbin: Harbin Institute of Technology Press, 1988.
16	罗晋如, GODFREY A, 刘伟, 等初始织构对高温轧制AZ31镁合金板显微组织与织构影响的EBSD研究[J]. 电子显微学报, 2011, 30 (4-5): 299- 302.
16	LUO Jin-ru, GODFREY A, LIU Wei, et al Study of effects of initial texture on the microstructure and texture for hot rolled AZ31 Mg alloy sheet using EBSD[J]. Journal of Chinese Electron Microscopy Society, 2011, 30 (4-5): 299- 302.
17	KELLEY E W, HOSFORD W F Plane-strain compression of magnesium and magnesium alloy crystals[J]. Trans Met Soc AIME, 1968, 242 (1): 5- 13.
18	孟利, 杨平, 解延雷, 等低应变速率下AZ31镁合金热形变过程的取向成像分析[J]. 中国体视学与图像分析, 2004, 9 (3): 129- 133.
18	MENG Li, YANG Ping, JIE Yan-lei, et al An oim analysis on the deformation mechanism in hot compressed AZ31 magnesium alloy[J]. Chinese Journal of Stereology and Image Analysis, 2004, 9 (3): 129- 133.

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