A356覆层温度对AZ31/A356轧制复合板界面组织及力学性能的影响
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摘要
采用铸轧法制备的镁/铝复合板,研究了A356铝合金覆层温度对界面组织及力学性能的影响。结果表明,镁/铝复合板界面过渡区可分为三个区域,靠近AZ31一侧可能形成了镁侧过渡区Ⅰ区(δ-Mg和Mg_(17)Al_(12)),靠近A356一侧可能形成了铝侧过渡区Ⅱ区(α-Al和Al_3Mg_2),以及扩散界面中间区Ⅲ区(Mg_(17)Al_(12)、Mg_2Si和Al_3Mg_2)。随着A356覆层温度的升高,界面过渡区的宽度持续增加,且金属间化合物的种类增多、体积分数增大。界面过渡区的显微硬度比基体的高,剪切实验时易在脆性相处发生断裂,靠近AZ31一侧为解理断裂,靠近A356一侧为准解理断裂,均为脆性断裂。A356覆层温度为640℃时,复合板的剪切强度达到最大值,为108 MPa。
The present work aims to investigate the effects of A356 covering plate temperature on interfacial microstructure and mechanical properties of the cast-rolled Mg/Al composite plate. The results indicate that the interfacial transition zone of Mg/Al can be divided into three regions: region I is adjacent to Mg and may form Mg transition region( δ-Mg and Mg_(17)Al_(12)),region II is adjacent to Al and may form Al transition region( α-Al and Al_3Mg_2),region III is regarded as the diffusion interfacial intermediate region( Mg_(17)Al_(12),Mg_2 Si and Al_3Mg_2). The increasing temperature of the A356 covering plate results in a continuous rise of the width of the interfacial transition zone,and also the increment of type and volume fraction of the intermetallic compounds. Microhardness in the interfacial transition zone is higher than that of the matrix. It is easy to observe the phenomenon of brittle fracture along the brittle phase during the shear strength test. There occur cleavage fracture and quasi-cleavage fracture,both of which are brittle fracture,at AZ31 side and A356 side,respectively. The shear strength of the composite plate reaches its maximum value of 108 MPa when the temperature of the A356 covering plate is 640 ℃.
The present work aims to investigate the effects of A356 covering plate temperature on interfacial microstructure and mechanical properties of the cast-rolled Mg/Al composite plate. The results indicate that the interfacial transition zone of Mg/Al can be divided into three regions: region I is adjacent to Mg and may form Mg transition region( δ-Mg and Mg_(17)Al_(12)),region II is adjacent to Al and may form Al transition region( α-Al and Al_3Mg_2),region III is regarded as the diffusion interfacial intermediate region( Mg_(17)Al_(12),Mg_2 Si and Al_3Mg_2). The increasing temperature of the A356 covering plate results in a continuous rise of the width of the interfacial transition zone,and also the increment of type and volume fraction of the intermetallic compounds. Microhardness in the interfacial transition zone is higher than that of the matrix. It is easy to observe the phenomenon of brittle fracture along the brittle phase during the shear strength test. There occur cleavage fracture and quasi-cleavage fracture,both of which are brittle fracture,at AZ31 side and A356 side,respectively. The shear strength of the composite plate reaches its maximum value of 108 MPa when the temperature of the A356 covering plate is 640 ℃.
引文
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2 Eldesouky A,Johnsson M,Svengren H,et al. Journal of Alloys and Compounds,2014,609,215.
3 Muralidharan,Paramsothy,Manoj Gupta. Materials and Design,2015,66,557.
4 Habibnejad-Korayem M,Mahmudi R,Ghasemi H M,et al. Wear,2010,268,405.
5 Nie J F,Zhu Y M,Liu J Z,et al. Science,2013,340,957.
6 Liu F,Liang W,Li X,et al. Journal of Alloys and Compounds,2008,461,399.
7 Li X,Liang W,Zhao X,et al. Journal of Alloys and Compounds,2009,471,408.
8 Spencer K,Zhang M X. Scripta Materialia,2009,61,44.
9 Liu P,Li Y J,Geng H R,et al. Materials Letters,2005,59,2001.
10 Wang J F,Wu Z S,Wang S H,et al. Materials Review B:Research Papers,2016,30(12),59(in Chinese).王敬丰,吴忠山,王少华,等.材料导报:研究篇,2016,30(12),59.
11 Li X B,Zu G Y,Wang P. The Chinese Journal of Nonferrous Metals,2013,23(5),1202(in Chinese).李小兵,祖国胤,王平.中国有色金属学报,2013,23(5),1202.
12 Mojtaba Jafarian,Mohsen Saboktakin Rizi,Morteza Jafarian,et al. Materials Science and Engineering A,2016,666,372.
13 Shang J,Wang K L,Zhou Q,et al. Transactions of Nonferrous Metals Society of China,2012,22,1961.
14 Wu K,Chang H,Maawad E,et al. Materials Science and Engineering A,2010,527,3073.
15 Zhang X P,Yang T H,Castagne S,et al. Materials Science and Engineering A,2011,528,1954.
16 Jin Y J,Khan T I. Materials and Design,2012,38,32.
17 Li Z B. Study on liquid-solid composite boinding of Mg/Al bimetal. Master’s Thesis,Harbin Engineering University,China,2014(in Chinese).李增贝. Mg/Al双金属液固复合连接的研究.硕士学位论文,哈尔滨工程大学,2014.
18 Joseph Fernandus M,Senthilkumar T,Balasubramanian V,et al. Materials and Design,2012,33,31.
19 Guo Q W,Wang G S,Guo G C. Commonly used nonferrous binary alloy phase atlas,Chemical Industry Press,China,2010(in Chinese).郭青蔚,王桂生,郭庚辰.常用有色金属二元合金相图集,化学工业出版社,2010.
20 Liu J C,Hu J,Nie X Y,et al. Materials Science and Engineering A,2015,365,70.
21 Liu W S,Long L P,Ma Y Z,et al. Journal of Alloys and Compounds,2015,643,34.
22 Zhong P C,Zhao Z H. Fractography,Higher Education Press,China,2006(in Chinese).钟群鹏,赵子华.断口学,高等教育出版社,2006.
23 Zhu B,Liang W,Li X R. Materials Science and Engineering A,2011,528,6584.
24 Sarah Brennan,Katrina Bermudez,Nagrajs. Kulkarni,et al. Metallurgical and Materials Transactions A,2012,43,2012.
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