定向凝固Al-Y合金组织演化规律及小平面相生长 II. Al-53%Y包晶合金组织演化规律
MICROSTRUCTURE EVOLUTION AND GROWTH BEHAVIORS OF FACETED PHASE IN DIRECTIONALLY SOLIDIFIED Al-Y ALLOYS II. Microstructure Evolution of Directionally Solidified Al-53%YPeritectic Alloy
查看参考文献28篇
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文摘
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对Al-53%Y(质量分数)包晶合金在1~100 μm/s的抽拉速率下进行定向凝固实验,研究了合金组织演化及包晶合金中两相的竞争和生长行为.结果表明,铸态Al-53%Y合金的显微组织主要由初生Al_2Y相、包晶Al_3Y相和Al_3Y/A1共晶体组成.在低速1 μm/s定向凝固过程中,初生相与包晶相均连续生长,出现了平行于固/液界面的近似带状组织.随着凝固距离的增加,固/液界面处的领先相由初生Al_2Y转变为包晶Al_3Y,固/液界面为粗大条形Al_3Y相,而无初生相.在较高抽拉速率的定向凝固过程中,随着抽拉速率的增加,Al_2Y相由平界面生长转变为胞状形态,后又转变为枝晶状.包晶相Al_3Y最初以锯齿状包裹在初生相表面,同时在液相中以细针状直接析出,抽拉速率越大,包晶相Al_3Y数量越多且尺寸越细小.随着凝固距离的延长,包裹初生相的包晶相厚度增加,体积分数增大.另外,从液相中直接析出的Al_3Y相逐渐长大,由细针状变为短棒状、块状,均匀分布在包晶组织周围并与之相连接. |
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其他语种文摘
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Peritectic reaction is frequently encountered in many technologically important materials (e.g., steels, brass, bronze, intermetallic compounds, magnetic materials and YBa_2Cu_3O_x superconductors). Many interesting microstructures have been found during directional solidification of peritectic alloys, which have drawn much attention since last decade. In this work, in order to investigate the growth behavior of Al_3Y phase as a peritectic phase, directioanal solidification experiments at different pulling rates have been performed on Al-53%Y (mass fraction) peritectic alloy. The results show that the primary phase and the peritectic phase both grow continuously, the microstructure, which is parallel to the solid-liquid interface has been found and explained at a low pulling rate(V=1 μm/s). With the growth distance increase, the precipitating solid phase from the liquid at the quenching solid-liquid interface transforms from primary Al_2Y phase to peritectic Al_3Y phase. The interface consists of coarse Al_3Y phase without Al_2Y phase. At relatively high pulling rates, the morphologies of primary Al_2Y phase transit from continuous growth to cellular phase, and further to dendrites with the pulling rate increase. The results also show that the primary phase is enclosed with the serrate peritectic phase, and Al_3Y phase precipitates from the liquid in needle shape at the same time. With the growth distance further increase, Al_3Y phase become thicker and more numerous. In addition, the Al_3Y phase precipitated from liquid transit from needle shape to short rod and lump shape, which distributes around the peritectic structure. |
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来源
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金属学报
,2016,52(7):866-874 【核心库】
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DOI
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10.11900/0412.1961.2015.00620
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关键词
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Al-Y包晶合金
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定向凝固
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金属间化合物
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小平面生长
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地址
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1.
哈尔滨工业大学, 金属精密热加工国家级重点实验室, 哈尔滨, 150001
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沈阳黎明航空发动机(集团)有限责任公司, 沈阳, 110043
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0412-1961 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:5741688
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