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鑄造1060/AZ31包鋁鎂合金界面結構與顯微組織

Microstructure and interfacial configuration of AZ31 magnesium alloy ingots clad by 1060 aluminium

  • 摘要: 為探索和改善軋制包鋁鎂合金板的界面結合狀況,用氣體保護鑄造法制備了1060鋁板包覆AZ31鎂合金鑄錠.借助金相顯微鏡、掃描電鏡以及X射線衍射等分析方法,研究了復合鑄錠芯材及界面的顯微組織和相結構,并進行了硬度測試.發現AZ31鎂合金芯材組織由α-Mg基體以及沿晶界分布的不連續網狀α-Mg+β-Mg17Al12共晶體組成,是一種典型的鑄造離異共晶組織.鑄造包鋁鎂合金錠界面形成擴散溶解層,擴散溶解層由α-Mg固溶體層、共晶層(α-Mg+β-17Al12)、β-17Al12及AlMg化合物層組成,形成具有多層結構的冶金結合界面.提出了澆注AZ31熔體的瞬間在1060鋁板表面形成"熔池"并快速凝固的界面形成機制.

     

    Abstract: 1060 aluminium cladding AZ31 magnesium alloy composite ingots were prepared under gas protection to investigate and improve the interfacial combination. The microstructure, phase constituents and microhardness of the matrix and the interface were studied by use of optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It is found that the microstructure of the as-cast AZ31 magnesium alloy consists mainly of the α-Mg matrix and the typical divorced eutectic of α-Mg and β-17Al12 phases distributed along grain boundaries. A diffusion fusion layer forms in the interface, leading to a complex metallurgical interface with a multilayer of the α-Mg solid solution zone, the eutectic (α-Mg + β-17Al12) zone and the Mg-Al intermetallic compound zone. The Mg-Al intermetallic compounds are made up of β-17Al12 and AlMg. It is proposed that the formation mechanism of the complex interface layer is due to the emergence of a molten bath on the 1060 Al plate surface at AZ31 melt pouring moment and the rapid solidification subsequently.

     

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