| 液态金属冷却工艺对NiAl-Cr(Mo)-Hf(Ho)定向合金组织的影响 |
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| 引用本文： | 肖旋,郭建亭,刘阳,赵海涛.液态金属冷却工艺对NiAl-Cr(Mo)-Hf(Ho)定向合金组织的影响[J].材料研究学报,2009,23(4). |
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| 作者姓名： | 肖旋 郭建亭 刘阳 赵海涛 |
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| 作者单位： | 1. 沈阳理工大学沈阳,110168
2. 中国科学院金属研究所,沈阳,110016 |
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| 摘 要： | 用液态金属冷却技术(LMC)和传统的定向凝固技术(HRS)制备了名义成分为Ni-33Al-31Cr-2.9Mo-0.1Hf-0.05Ho(%,原子分数)的定向合金,研究了制备工艺对其组织的影响.结果表明,合金由初生NiAl枝晶、NiAl/Cr(Mo)共晶胞和少量Hf同溶体组成.与HRS工艺相比,LMC工艺能提高同液前沿温度梯度和冷却速度.较高的固液前沿温度梯度扩大了NiAl/Cr(Mo)共晶共生区成分范围,减少初生NiAl枝晶的体积分数.而较高的冷却速度抑制固溶元素扩散,细化定向合金的组织,增加合金中固溶元素总量.另外,LMC工艺能避免HRS工艺中产生的生长缺陷,包括斑点,NiAl一次枝晶的偏转和NiAl一次枝晶的不连续.
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| 关 键 词： | 金属材料 金属问化合物 NiAl合金 定向凝固工艺 液态金属冷却技术 显微组织 |
Effect of liquid metal cooling on microstructures of directionally solidified NiAl-Cr(Mo)-Hf(Ho) alloy |
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| Xiao Xuan,Guo Jianting,Liu Yang,Zhao Haitao.Effect of liquid metal cooling on microstructures of directionally solidified NiAl-Cr(Mo)-Hf(Ho) alloy[J].Chinese Journal of Materials Research,2009,23(4). |
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| Authors: | Xiao Xuan Guo Jianting Liu Yang Zhao Haitao |
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| Affiliation: | Xiao Xuan~(1**) Guo Jianting~2 Liu Yang~1 Zhao Haitao~1 1.Shenyang University of Science , Technology,Shenyang 110168 2.Institute of Metal Research,CAS,Shenyang 110016 |
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| Abstract: | The alloy with nominal composition Ni-33AI-31Cr-2.9Mo-0.1Hf-0.05Ho(%) has been directionally solidified by liquid metal cooling(LMC) and conventional high rate solidification(HRS) processes.Investigations reveal that the directionally solidified alloys are composed of primary dendritic NiAl,NiAI/Cr(Mo) eutectic cell and Hf solid solution.Compared with the conventional high rate solidification process,the liquid metal cooling process can provide higher thermal gradient and higher cooling rate.Higher thermal ... |
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| Keywords: | metallic materials intermetallics NiAl alloy directional solidification liquid metal cooling technique microstructure |
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