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

doi:10.11896/cldb.18050096

材料导报

2019, Vol. 33

Issue (14): 2397-2402 https://doi.org/10.11896/cldb.18050096

金属与金属基复合材料

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

杨世杰¹, 李元东^1,2, 曹驰^1,2, 董澎源¹, 李嘉铭¹, 李明¹

1 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050;
2 兰州理工大学有色金属合金及加工教育部重点实验室,兰州 730050

Effect of A356 Covering Plate Temperature on the Microstructure and Mechanical Properties of AZ31/A356 Composite Plate Fabricated by Cast Roll Bonding

YANG Shijie¹, LI Yuandong^1,2, CAO Chi^1,2, DONG Pengyuan¹, LI Jiaming¹, LI Ming¹

1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050;
2 Key Laboratory of Non-ferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050

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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Mg₁₇Al₁₂),靠近A356一侧可能形成了铝侧过渡区Ⅱ区(α-Al和Al₃Mg₂),以及扩散界面中间区Ⅲ区(Mg₁₇Al₁₂、Mg₂Si和Al₃Mg₂)。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。

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	杨世杰
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	李明

关键词: 镁/铝复合板力学性能界面过渡区金属间化合物

Abstract: 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 Mg₁₇Al₁₂), region II is adjacent to Al and may form Al transition region (α-Al and Al₃Mg₂), region III is regarded as the diffusion interfacial intermediate region (Mg₁₇Al₁₂, Mg₂Si and Al₃Mg₂). 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 ℃.

Key words: Mg/Al composite plate mechanical property interfacial transition zone intermetallic compound

发布日期: 2019-06-19

ZTFLH:

TG335.81

基金资助: 国家自然科学基金(51464031);甘肃省重点研发计划(17YF1GA021)

通讯作者: liydlut@163.com

作者简介: 杨世杰,就读于兰州理工大学材料科学与工程学院研究生三年级,工程硕士。主要从事金属基复合材料(层状金属复合材料)领域的研究。李元东,兰州理工大学材料科学与工程学院教授,博士研究生导师。1995年6月毕业于甘肃工业大学铸造专业并留校任教,2000年6月获甘肃工业大学硕士学位,2005年获得兰州理工大学材料加工工程博士学位。主要从事铸造铝合金、镁合金和半固态成形及其凝固行为、自孕育铸造、扩散凝固、锌基合金及其复合材料、变形合金铸造成形技术、表面改性与处理等方面的研究。提出了自孕育凝固的概念及理论。申请发明专利12件,获省部级科技奖励7项。发表论文90多篇。SCI、EI收录40多篇。

引用本文:

杨世杰, 李元东, 曹驰, 董澎源, 李嘉铭, 李明. 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[J]. 材料导报, 2019, 33(14): 2397-2402.
YANG Shijie, LI Yuandong, CAO Chi, DONG Pengyuan, LI Jiaming, LI Ming. Effect of A356 Covering Plate Temperature on the Microstructure and Mechanical Properties of AZ31/A356 Composite Plate Fabricated by Cast Roll Bonding. Materials Reports, 2019, 33(14): 2397-2402.

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http://www.mater-rep.com/CN/10.11896/cldb.18050096 或 http://www.mater-rep.com/CN/Y2019/V33/I14/2397

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