| RELATIONSHIP BETWEEN PRIMARY MORPHOLOGY AND CRYSTAL STRUCTURE OF CARBIDES GROWING IN SUPERALLOYS |
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| 引用本文： | LIU Lin FU Hengzhi SHI Zhengxing Northwestern Polytechnical University,Xi''''an,China Dr.LIU Lin Lecturer,Department of Applied Physics,Northwestern Polytechnical University,Xi''''an 710072,China. RELATIONSHIP BETWEEN PRIMARY MORPHOLOGY AND CRYSTAL STRUCTURE OF CARBIDES GROWING IN SUPERALLOYS[J]. 金属学报(英文版), 1990, 3(1): 46-51 |
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| 作者姓名： | LIU Lin FU Hengzhi SHI Zhengxing Northwestern Polytechnical University Xi''''an China Dr.LIU Lin Lecturer Department of Applied Physics Northwestern Polytechnical University Xi''''an 710072 China |
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| 作者单位： | LIU Lin FU Hengzhi SHI Zhengxing Northwestern Polytechnical University，Xi'an，China Dr.LIU Lin Lecturer，Department of Applied Physics，Northwestern Polytechnical University，Xi'an 710072，China |
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| 摘 要： | The SEM analysis of decply etched specimens of Ni-base superalloys K38 and K19H+Ta in-dicates that both the primary morphologies under normal growth conditions and the finalmorphologies near equilibrium of MC carbides are octahedral blocks.The classification ofMC crystal faces by means of PBC(Periodic Bond Chains)theory confirms that{100},{110}and{111}are F faces,and that{212}are S faces.The calculations of the attachmentenergy for each F face show that{111}are most easily appeared.It has also been inferred thatone of the MC growth units is a coordination octahedron composed of one metal atom sur-rounded by six carbon atoms.The octahedral growth units can be attached to the growth sur-faces of MC carbides through laver stacking mechanism on the{111}faces.
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| 收稿时间： | 1990-02-25 |
| 修稿时间： | 1990-02-25 |
RELATIONSHIP BETWEEN PRIMARY MORPHOLOGY AND CRYSTAL STRUCTURE OF CARBIDES GROWING IN SUPERALLOYS |
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| LIU Lin FU Hengzhi SHI Zhengxing Northwestern Polytechnical University,Xi'an,China Dr.LIU Lin Lecturer. RELATIONSHIP BETWEEN PRIMARY MORPHOLOGY AND CRYSTAL STRUCTURE OF CARBIDES GROWING IN SUPERALLOYS[J]. Acta Metallurgica Sinica(English Letters), 1990, 3(1): 46-51 |
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| Authors: | LIU Lin FU Hengzhi SHI Zhengxing Northwestern Polytechnical University Xi'an China Dr.LIU Lin Lecturer |
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| Affiliation: | LIU Lin FU Hengzhi SHI Zhengxing Northwestern Polytechnical University,Xi'an,China Dr.LIU Lin Lecturer,Department of Applied Physics,Northwestern Polytechnical University,Xi'an,China |
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| Abstract: | The SEM analysis of decply etched specimens of Ni-base superalloys K38 and K19H+Ta in- dicates that both the primary morphologies under normal growth conditions and the final morphologies near equilibrium of MC carbides are octahedral blocks.The classification of MC crystal faces by means of PBC(Periodic Bond Chains)theory confirms that{100}, {110}and{111}are F faces,and that{212}are S faces.The calculations of the attachment energy for each F face show that{111}are most easily appeared.It has also been inferred that one of the MC growth units is a coordination octahedron composed of one metal atom sur- rounded by six carbon atoms.The octahedral growth units can be attached to the growth sur- faces of MC carbides through laver stacking mechanism on the{111}faces. |
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| Keywords: | carbide crystal growth |
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