AZ31镁合金压弯-压平复合变形孪晶组织及力学性能
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摘要
分析镁合金压弯-压平复合变形特征,确定复合变形工艺参数,对AZ31镁合金压弯-压平复合变形进行了实验研究。研究结果表明,随着变形温度的增大,镁合金在压弯-压平复合变形过程中出现明显的孪晶组织,当变形温度为498K时,孪晶组织的比例最大,孪生为主要变形机制。当变形温度为483K时,细小的再结晶晶粒替代初始的孪晶区域带,平均晶粒尺寸为12.2μm。当变形温度为443K时,经过压弯-压平复合变形后的AZ31镁合金成形性能得到明显提高,当变形温度在483K时,循环变形道次为3次时,AZ31镁合金的延伸率为17.1%,较原始材料提高42%。
The characteristics of bending-flattening compound deformation technology(BFCDT) of magnesium alloy were analyzed,and the technological parameters were determined.Experimental research on BFCDT of AZ31 magnesium alloy is completed.The results show that with the increase of deformation temperature,the twin structure appears obviously in the BFCDT process of AZ31 magnesium alloy.When the deformation temperature is 498 K,the proportion of twin structure is the biggest,and twinning is the main deformation mechanism.When the deformation temperature is 483 K,the fine recrystallized grain replaces the original twin zone,and the average grain size is 12.2 μm.When the deformation temperature is 483 K and ECAP pass is 3,the elongation of AZ31 magnesium alloy is 17.1%,which is increased by 42% than that of the original material.
The characteristics of bending-flattening compound deformation technology(BFCDT) of magnesium alloy were analyzed,and the technological parameters were determined.Experimental research on BFCDT of AZ31 magnesium alloy is completed.The results show that with the increase of deformation temperature,the twin structure appears obviously in the BFCDT process of AZ31 magnesium alloy.When the deformation temperature is 498 K,the proportion of twin structure is the biggest,and twinning is the main deformation mechanism.When the deformation temperature is 483 K,the fine recrystallized grain replaces the original twin zone,and the average grain size is 12.2 μm.When the deformation temperature is 483 K and ECAP pass is 3,the elongation of AZ31 magnesium alloy is 17.1%,which is increased by 42% than that of the original material.
引文
[1] Huang G,Xu W.Textural Evolution of AZ31B Magnesium Alloy Sheets Undergoing Repeated Unidirectional Bending at Room Temperature[J].Journal of Materials Science & Technology,2009,25(3):365-369.
[2] HUANG Guang-sheng,LI Hong-cheng,SONG Bo,et al.Tensile properties and microstructure of AZ31B magnesium alloy sheet processed by repeated unidirectional bending[J].Transactions of Nonferrous Metals Society of China,2010,20(1):28-33.
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[4] Yu Pei Jiang,Xu Yue Yang,Lei Zhang.Grain refinement in AZ61 Mg alloy during hot cyclic bending[J].Materials Science Forum,2010,667-669:623-627.
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[6] ZHANG L,YANG X Y,HUO Q H.Structure evolution of AZ31 Mg alloy sheet during bidirectional cyclic bending at low temperature and subsequent annealing[J].Acta Metallurgica sinica,2011,47(8):990-996.
[7] HUANG Guang-sheng,ZHANG Hua,GAO Xiao-yun,et al.Forming limit of textured AZ31B magnesium alloy sheet at different temperatures[J].Transactions of Nonferrous Metals Society of China,2011,21(4):836-843.
[8] Bo Song,Guangsheng Huang,Hongcheng Li,et al.Texture evolution and mechanical properties of AZ31B magnesium alloy sheets processed by repeated unidirectional bending[J].Journal of Alloys and Compounds,2010,489(2):475-481.
[9] Liwei Lu,Chuming Liu,Jun Zhao,et al.Modification of grain refinement and texture in AZ31 Mg alloy by a new plastic deformation method[J].Journal of Alloys and Compounds,2015,628:130-134.
[10] Shingo Kudo,Shouta Yokoyama,Kosei Shimoyama,et al.Effect of dimple patterning conditions of periodical straining rolling on microstructures and mechanical properties of AZ31 sheets[J].Materials Science & Engineering A,2017,680:75-84.
[11] Kai Soon Fong,Atsushi Danno,Ming Jen Tan,et al.Tensile flow behavior of AZ31 magnesium alloy processed by severe plastic deformation and post-annealing at moderately high temperatures[J].Journal of Materials Processing Technology,2017,246:235-244.
[12] Jin Zhaoyang,Li Keyan,Wu Xintong,et al.Correlation between dynamic recrytallization and flow characteristic at high temperature of magnesium alloy[J].Journal of Yangzhou University(Natural Science Edition),2015,18(3):41-45.
[13] Sanjari M,Farzadfar A,Sakai T.A texture and microstructure analysis of high speed rolling of AZ31 using split Hopkinson pressure bar results[J],Journal of Materials Science,2013,48(19):6656-6672.
[14] 曲家惠,岳明凯,黄涛.AZ31镁合金在不同挤压比和挤压温度下的织构演变[J].沈阳理工大学学报,2009,28(2):48-51,94.
[15] 高升栋,王忠堂.AZ31镁合金异齿复合形变工艺的研究[J].沈阳理工大学学报,2016,35(6):7-12.
[16] 秦博,王忠堂.AZ31镁合金温热变形本构方程[J].沈阳理工大学学报,2016,35(3):91-95.
[2] HUANG Guang-sheng,LI Hong-cheng,SONG Bo,et al.Tensile properties and microstructure of AZ31B magnesium alloy sheet processed by repeated unidirectional bending[J].Transactions of Nonferrous Metals Society of China,2010,20(1):28-33.
[3] HUANG Guang-sheng,SONG Bo,XU Wei,et al.Structure and properties of AZ31B magnesium alloy sheets processed by repeatedly unidirectional bending at different temperatures[J].Transactions of Nonferrous Metals Society of China,2010,20(10):1815-1821.
[4] Yu Pei Jiang,Xu Yue Yang,Lei Zhang.Grain refinement in AZ61 Mg alloy during hot cyclic bending[J].Materials Science Forum,2010,667-669:623-627.
[5] Cheng Weili,Huo Rui,Lu Yangjie,et al.Microstructure and Mechanical Properties of Indirect-Extruded Mg-8Sn-1Al-1Zn Alloy with Ultrafine Grained Structure[J].Rare Metal Materials And Engineering,2014,43(11):2824-2828.
[6] ZHANG L,YANG X Y,HUO Q H.Structure evolution of AZ31 Mg alloy sheet during bidirectional cyclic bending at low temperature and subsequent annealing[J].Acta Metallurgica sinica,2011,47(8):990-996.
[7] HUANG Guang-sheng,ZHANG Hua,GAO Xiao-yun,et al.Forming limit of textured AZ31B magnesium alloy sheet at different temperatures[J].Transactions of Nonferrous Metals Society of China,2011,21(4):836-843.
[8] Bo Song,Guangsheng Huang,Hongcheng Li,et al.Texture evolution and mechanical properties of AZ31B magnesium alloy sheets processed by repeated unidirectional bending[J].Journal of Alloys and Compounds,2010,489(2):475-481.
[9] Liwei Lu,Chuming Liu,Jun Zhao,et al.Modification of grain refinement and texture in AZ31 Mg alloy by a new plastic deformation method[J].Journal of Alloys and Compounds,2015,628:130-134.
[10] Shingo Kudo,Shouta Yokoyama,Kosei Shimoyama,et al.Effect of dimple patterning conditions of periodical straining rolling on microstructures and mechanical properties of AZ31 sheets[J].Materials Science & Engineering A,2017,680:75-84.
[11] Kai Soon Fong,Atsushi Danno,Ming Jen Tan,et al.Tensile flow behavior of AZ31 magnesium alloy processed by severe plastic deformation and post-annealing at moderately high temperatures[J].Journal of Materials Processing Technology,2017,246:235-244.
[12] Jin Zhaoyang,Li Keyan,Wu Xintong,et al.Correlation between dynamic recrytallization and flow characteristic at high temperature of magnesium alloy[J].Journal of Yangzhou University(Natural Science Edition),2015,18(3):41-45.
[13] Sanjari M,Farzadfar A,Sakai T.A texture and microstructure analysis of high speed rolling of AZ31 using split Hopkinson pressure bar results[J],Journal of Materials Science,2013,48(19):6656-6672.
[14] 曲家惠,岳明凯,黄涛.AZ31镁合金在不同挤压比和挤压温度下的织构演变[J].沈阳理工大学学报,2009,28(2):48-51,94.
[15] 高升栋,王忠堂.AZ31镁合金异齿复合形变工艺的研究[J].沈阳理工大学学报,2016,35(6):7-12.
[16] 秦博,王忠堂.AZ31镁合金温热变形本构方程[J].沈阳理工大学学报,2016,35(3):91-95.