DONG Hongbiao JI Yongyi ZHU Jun LU Shuzu ZHONG Xueyou University of Science and Technology
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Beijing
,
ChinaLI Jianguo Northwestern Polytechnical University
,
Xi'an
,
China DONG Hongbiao
,
lecturer
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Department of Metallurgy
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University of Science and Technology Beijing
,
Beijing 100083
,
China
金属学报(英文版)
In situ eutectic Al_(11)La_3/Al composite material with regular arrangement was prepared by zone melt liquid metal cooling directionally solidification under conditions of high temperature gradient G=700K/cm and growth rate R=6.0-20.0μm/s.Superpose diffraction pat- tern of Al_(11)La_3/Al composite shows that the preferred growth direction is[100]Al// [33]Al_(11)La_3,and the habit plane is(002)Al//(116)Al_(11)La_3.A low density(103)twin is ob- served in Al_(11)La_3 and the growth of(103)twin induces to branching to change the interlamellar spacing.
关键词:
eutectic solidification
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null
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null
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null
董洪标
,
计永毅
,
朱峻
,
吕述祖
,
钟雪友
,
李建国
金属学报
利用定向凝固装置,在固-液界面前沿温度梯度很高的条件下, 在生长速度R=6.0-20.0μm/s的范围内制得了定向规则排列的自生复合Al_(11)La_3/Al共晶材料、并测得在此凝固条件下处于极值状况生长的共晶体?/R=1.42×10~(-8)cm~3/s利用TEM对该共晶体的选区衍射表明:共晶两相的择优取向为[100]Al∥331Al_(11)La_3,惯态平面为:(002)Al∥(116)Al_(11)La_3Al_(11)La_3,相生长前沿的(103)晶面孪晶生长,导致Al_(11)La_3相分枝,从而调整共晶片层间距λ
关键词:
共晶凝固
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directional solidification
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Al+(La
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Al)
梁娟
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金青林
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杨天武
,
李再久
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谢明
稀有金属材料与工程
金属-气体共晶定向凝固(Gasar)是制备藕状多孔金属的新工艺,利用自行研制的Gasar装置,制各了不同纯氧分压下的藕状多孔银试样,研究了氧气分压对藕状多孔银气孔形貌(气孔率、气孔尺寸和分布、气泡形核)的影响.结果表明:氧气分压对气孔形貌影响十分显著.随着氧气压力的增加,气孔率增大而平均气孔直径减小.
关键词:
藕状多孔
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共晶凝固
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多孔银
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氧
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气孔率
