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Al基釬料釬焊鎂合金AZ31B接頭的顯微組織及力學(xué)性能
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北京市教委科技發(fā)展計(jì)劃面上項(xiàng)目(KM200710005005)


Microstructure and Mechanical Properties of AZ31B Magnesium Alloy Brazed Joint Using Al Matrix Filler Metal
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    摘要:

    為了連接變形鎂合金AZ31B，以Al基釬料對(duì)變形鎂合金AZ31B進(jìn)行高頻感應(yīng)釬焊。采用掃描電鏡、X射線衍射儀、X射線能譜等分析釬焊接頭的顯微組織及釬縫物相，測(cè)試釬焊接頭的力學(xué)性能及顯微硬度。結(jié)果表明：在釬焊過(guò)程中熔融的Al基釬料與固態(tài)的AZ31B母材發(fā)生強(qiáng)烈的合金化作用，原始釬料中均一的Mg32(Al,Zn)49相在釬焊后完全消失，同時(shí)在釬縫中生成α-Mg、β-Mg17(Al,Zn)12相。釬焊搭接接頭的平均抗剪強(qiáng)度達(dá)到44 MPa，對(duì)接接頭的平均抗拉強(qiáng)度達(dá)到71 MPa。接頭的斷裂形式為沿晶脆性斷裂，斷裂產(chǎn)生在β-Mg17(Al,Zn)12硬脆相處

    Abstract:

    In order to join wrought magnesium alloy AZ31B plates, an Al matrix filler metal was developed to join them by means of high-frequency induction brazing. The microstructure and phase constitution of the brazed joint were investigated by scanning electron microscopy, X-ray diffraction and X-ray energy dispersive spectroscopy. The mechanical properties and microhardness of the brazed joint were also tested. The results show that the single Mg32(Al,Zn)49 phase in the original filler metal is consumed after the soldering process; moreover, α-Mg solid solution and β-Mg17(Al,Zn)12 phase are formed in brazing region due to the intensive alloying between the molten filler metal and the base metal in the process of brazing. The average tensile strength of the butted joint is 71 MPa and the average shearing strength of the overlapped joint is 44 MPa. The fracture surface of the brazed joint exhibits an intergranular fracture feature and the crack originates from the hard β-Mg17(Al,Zn)12 phase

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馬 力,賀定勇,李曉延,蔣建敏. Al基釬料釬焊鎂合金AZ31B接頭的顯微組織及力學(xué)性能[J].稀有金屬材料與工程,2011,40(9):1600~1604.[Ma Li, He Dingyong, Li Xiaoyan, Jiang Jianmin. Microstructure and Mechanical Properties of AZ31B Magnesium Alloy Brazed Joint Using Al Matrix Filler Metal[J]. Rare Metal Materials and Engineering,2011,40(9):1600~1604.]
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  • 收稿日期:2010-09-10
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