AZ31B镁合金与316L不锈钢的搅拌摩擦钎焊及其中间层优化

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中图分类号：TG454 文献标志码：A

DOI： 10.7652/xjtuxb202508021 文章编号：0253-987X（2025）08-0223-10

Stir Friction Brazing and Interlayer Optimization AZ31B Magnesium Alloy and 316L Stainless Steel

ZHAO Qihong， ZHANG Guifeng，CHANG Haicheng， JIANG Xin，WANG Shujic （ 71oo49，）

Abstract： To address the poor corrosion and wear resistance of magnesium alloys， as well as the challenges of effectively joining magnesium and steel using traditional welding methods，the use of stir friction brazing technology is proposed to connect AZ31B magnesium alloy and 316L stainless steel. First，different thicknesses of Zn and Ni foils are used to fabricate magnesium/ steel lap joints using the stir friction brazing process. The feasibility of these joints is then examined from the perspectives of wettability， microstructure， and mechanical properties. Finally，the interfacial reaction characteristics and mechanisms of different brazing materials are elucidated. Experimental results indicate that Zn foil exhibits good wettability on the magnesium ally side but almost none on the stainless-steel surface. When the Zn foil melts， it ms a eutectoid structure α-Mg+Mg/n at the joint，with a maximum shear strength of 27.38MPa ， resulting in brittle fracture. Conversely，Ni foil demonstrates good wettability on both base materials，leading to the mation of a hypoeutectic structure （Ni，Al）] and eutectic structure α-Mg+Mg2（Ni，Al） or Mg2Ni at the joint. The shear strength of the joint initially increases and then decreases with increasing brazing material thickness，reaching 58.24MPa at a thickness of 0. 03mm ，exhibiting a combination of brittle and ductile fracture. The proposed stir friction brazing process can achieve high density， good wettability，wide single pass welds，and high strength in magnesium alloy/stainless steel lap joints through interlayer optimization.

words： magnesium/steel; friction stir brazing; interlayer; microstructure; shear strength

作为一种轻质金属，镁的密度较低，约为铝的2/3，钢材的 1/4[1] ，但镁合金以其比强度高、阻尼吸震性和导热性好、电磁屏蔽能力强等优良特点已成为目前的研究热点[2]。（剩余15406字）