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離心鑄造AZ61A鎂合金管的顯微組織和力學(xué)性能
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國家自然科學(xué)基金(0674018，50874022)


Microstructure and Mechanical Properties of Centrifugal Casting AZ61A Magnesium Alloy Tube
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    摘要:

    利用離心鑄造工藝制備大口徑AZ61A鎂合金薄壁管，研究了其顯微組織及力學(xué)性能，與傳統(tǒng)砂型凝固鑄件進行了比較分析。結(jié)果表明，離心鑄造鎂合金管晶粒得到了顯著的細化；平衡凝固條件下的L→α-Mg＋β-Mg17Al12共晶轉(zhuǎn)變在很大程度上被抑制，形成以過飽和初生相α-Mg為主相的凝固組織；合金元素的整體分布均衡；力學(xué)性能得到提高，斷口上存在大量韌窩，具有準(zhǔn)解理斷裂特性，顯示塑性得到了明顯改善

    Abstract:

    AZ61A magnesium alloy tube with large diameter and thin wall was fabricated by centrifugal casting technique. The microstructures and tensile properties of the tube were studied and it was compared with the conventional sand casting. The results show that the grains of the tube by centrifugal casting are significantly refined. The eutectic transformation L→ α-Mg+β-Mg17Al12 are suppressed to a great extent under the balanced solidification condition. As a consequence, the alloying elements Al and Zn show much higher solid solubility and the microstructure of the tube dominantly consists of supersaturated primary α-Mg solid solution. The tensile properties of the centrifugal casting tube are remarkably increased. In addition, the fracture surfaces exhibit amounts of dimples, indicating quasi-cleavage ductile fracture characteristics, and the ductility is improved obviously

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滕海濤,張小立,齊 凱,李廷舉.離心鑄造AZ61A鎂合金管的顯微組織和力學(xué)性能[J].稀有金屬材料與工程,2010,39(8):1465~1469.[Teng Haitao, Zhang Xiaoli, Qi Kai, Li Tingju. Microstructure and Mechanical Properties of Centrifugal Casting AZ61A Magnesium Alloy Tube[J]. Rare Metal Materials and Engineering,2010,39(8):1465~1469.]
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  • 收稿日期:2009-08-23
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