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NiAl-Mo共晶復(fù)合材料定向凝固組織特性研究
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國家航空科學(xué)基金(2007ZF53067)


Study on Characteristics of Directionally-Solidified Microstructure for NiAl-Mo Eutectic Composites
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    摘要:

    采用定向凝固技術(shù)制備出兩種不同成分的NiAl-Mo共晶復(fù)合材料，研究在不同抽拉速率下該合金的凝固組織特性。結(jié)果表明：46.59Ni-45.61Al-7.8Mo (at%, 下同)合金在不同抽拉速率下都形成了亞共晶組織，初生的NiAl相呈樹枝晶狀，并且隨著抽拉的進行，優(yōu)先生長方向與熱流方向不一致的枝晶被逐漸淘汰；隨著抽拉速率的增加，NiAl相的枝晶間距也不斷的減小。44.86Ni-46.3Al-9.01Mo合金在不同抽拉速率下皆形成以棒狀Mo相鑲嵌在NiAl基體中的共晶組織，隨著抽拉速率的增加，Mo相的平均直徑和平均棒間距有越來越小的趨勢，在抽拉速率達(dá)到14 mm/h以上時，Mo相由連續(xù)的、排列均勻的棒狀變?yōu)閿嗬m(xù)的、排列不均勻的棒狀

    Abstract:

    NiAl-Mo eutectic composites with two kinds of composition, 46.59Ni-45.61Al-7.8Mo and 44.86Ni-46.3Al-9.01Mo(at%), were prepared by directional solidification technology. The characteristics of solidification microstructure for the alloys at different withdrawing rates were studied. Results show that the microstructure of 46.59Ni-45.61Al-7.8Mo alloy was hypoeutectic at different withdrawing rates. The primary NiAl phase was dendritic; those initial dendrites disappeared gradually as their preferred growth direction did not coincide with the direction of heat transfer during the vertical directional solidification. With increase of the withdrawing rate, the dendrite arm spacing of NiAl phases was decreased little by little. For the 44.86Ni-46.3Al-9.01Mo alloy, eutectic microstructure of rod-like Mo phases inserted in NiAl matrix was formed at different withdrawing rates. With the increase of the withdrawing rate, both of the average spacing and the average diameter of the Mo phases decreased. When the withdrawing rate exceeded 14 mm/h, the continuous and regularly-ranged rod-like Mo-phase turned to irregular and discontinuous

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蘇慧平,沈 軍,張建飛,傅恒志. NiAl-Mo共晶復(fù)合材料定向凝固組織特性研究[J].稀有金屬材料與工程,2010,39(6):1009~1012.[Su Huiping, Shen Jun, Zhang Jianfei, Fu Hengzhi. Study on Characteristics of Directionally-Solidified Microstructure for NiAl-Mo Eutectic Composites[J]. Rare Metal Materials and Engineering,2010,39(6):1009~1012.]
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  • 收稿日期:2009-06-05
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