AZ31B鎂合金與316L不銹鋼的攪拌摩擦釬焊及其中間層優(yōu)化

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中圖分類號：TG454 文獻標(biāo)志碼：A

DOI： 10.7652/xjtuxb202508021 文章編號：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

作為一種輕質(zhì)金屬，鎂的密度較低，約為鋁的2/3，鋼材的 1/4[1] ，但鎂合金以其比強度高、阻尼吸震性和導(dǎo)熱性好、電磁屏蔽能力強等優(yōu)良特點已成為目前的研究熱點[2]。（剩余15406字）