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材料工程  2017, Vol. 45 Issue (4): 21-26    DOI: 10.11868/j.issn.1001-4381.2015.000086
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冷金属过渡条件下AZ61镁合金在两种钢板上的润湿行为
曾承宗, 林巧力, 曹睿, 陈剑虹
兰州理工大学 有色金属先进加工与再利用省部共建国家重点实验室, 兰州 730050
Wetting Behavior of Molten AZ61 Magnesium Alloy on Two Different Steel Plates Under the Cold Metal Transfer Condition
ZENG Cheng-zong, LIN Qiao-li, CAO Rui, CHEN Jian-hong
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
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摘要 采用动态座滴法研究冷金属过渡条件下,AZ61镁合金分别在Q235钢板和镀锌钢板表面的润湿行为及其界面微观结构。结果表明:润湿行为与焊接工艺参数中的送丝速率密切相关;无论基板采用镀锌钢还是Q235钢在界面处均观察到Al-Fe金属间化合物层,其形成符合热力学形成条件;在Q235钢表面润湿时,送丝速率增加,界面反应变得剧烈,因而润湿性变好,在镀锌钢表面润湿时,送丝速率增加,加剧锌的挥发,使裸露的表面显金属性,因而润湿性变好;当送丝速率≤10.5m·min-1时,镁在Q235钢板上的润湿性要好于镀锌钢板,且后者锌的挥发将导致工艺不稳定。
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曾承宗
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陈剑虹
关键词 冷金属过渡镁-钢异种金属润湿性界面结构    
Abstract:The wetting behavior and interfacial microstructures of molten magnesium AZ61 alloy on the surface of two different Q235 and galvanized steel plates under the condition of cold metal transfer were investigated by using dynamic sessile drop method. The results show that the wetting behavior is closely related to the wire feed speed. Al-Fe intermetallic layer was observed whether the substrate is Q235 steel or galvanized steel, and the formation of Al-Fe intermetallic layer should satisfy the thermodynamic condition of such Mg-Al/Fe system. The wettability of molten AZ61 magnesium alloy is improved with the increase of wire feed speed whether on Q235 steel surface or on galvanized steel surface, good wettability on Q235 steel surface is due to severe interface reaction when wire feed speed increases, good wettability on galvanized steel surface is attributed to the aggravating zinc volatilization. When the wire feed speed is ≤10.5m·min-1, the wettability of Mg alloy on Q235 steel plate is better than on galvanized steel plate. However, Zn vapor will result in instability for metal transfer process.
Key wordscold metal transfer    magnesium-steel dissimilar metal    wettability    interface structure
收稿日期: 2015-01-19      出版日期: 2017-04-17
中图分类号:  TG444+.2  
通讯作者: 林巧力(1983-),男,博士,副教授,硕士研究生导师,主要研究方向:金属高温润湿性、界面化学及连接技术的研究,联系地址:甘肃省兰州市七里河区兰州理工大学校本部(730050),E-mail:lqllinqiaoli@163.com     E-mail: lqllinqiaoli@163.com
引用本文:   
曾承宗, 林巧力, 曹睿, 陈剑虹. 冷金属过渡条件下AZ61镁合金在两种钢板上的润湿行为[J]. 材料工程, 2017, 45(4): 21-26.
ZENG Cheng-zong, LIN Qiao-li, CAO Rui, CHEN Jian-hong. Wetting Behavior of Molten AZ61 Magnesium Alloy on Two Different Steel Plates Under the Cold Metal Transfer Condition. Journal of Materials Engineering, 2017, 45(4): 21-26.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000086      或      http://jme.biam.ac.cn/CN/Y2017/V45/I4/21
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