Experimental Studies of the Structure of Grain Boundaries. Progress Report PDF Download
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Languages : en
Pages : 9
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Goals are to understand factors affecting structure of grain boundaries in intermetallic compounds, understand how solute segregation affects grain boundary structure and causes embrittlement in Fe-base alloys, and explore control of grain boundary properties. Fe and boron-doped Ni3Al and NiAl were studied. 7 figs, 1 tab, 18 refs.
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Category :
Languages : en
Pages : 9
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Book Description
Goals are to understand factors affecting structure of grain boundaries in intermetallic compounds, understand how solute segregation affects grain boundary structure and causes embrittlement in Fe-base alloys, and explore control of grain boundary properties. Fe and boron-doped Ni3Al and NiAl were studied. 7 figs, 1 tab, 18 refs.
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Languages : en
Pages :
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A broad investigation of the structure and properties of grain boundaries has been conducted. The approach was mainly experimental, and extensive use was made of high resolution methods of investigating grain boundaries in specimens containing boundaries of controlled geometry. Progress was made in the following areas: (A) methods for preparing thin-film specimens containing boundaries of controlled geometry; (B) study of the fine structure of high angle boundaries with emphasis on the detection of relaxations into various fit-misfit structures; (C) structure of low angle grain boundaries; (D) faceting and the preferred crystal orientation of grain boundaries; (E) grain boundaries as sinks for point defects; and (F) diffusion along grain boundaries.
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Languages : en
Pages : 9
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Goals are to understand factors affecting structure of grain boundaries in intermetallic compounds, understand how solute segregation affects grain boundary structure and causes embrittlement in Fe-base alloys, and explore control of grain boundary properties. Fe and boron-doped Ni[sub 3]Al and NiAl were studied. 7 figs, 1 tab, 18 refs.
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Category : Power resources
Languages : en
Pages : 848
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Category : Aeronautics
Languages : en
Pages : 602
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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Category : Power resources
Languages : en
Pages : 782
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Category :
Languages : en
Pages : 11
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Observations have shown that the APB energy in boron-doped grain boundaries in Ni3Al decreases with increasing misorientation angle. Boron segregation to a grain boundary in Ni3Al has been observed for the first time using EELS. The boron distribution along a large angle grain boundary in Ni{sub 0.76}Al{sub 0.24} was shown to be not uniform. The boron-rich regions of the grain boundary were seen to have similar nickel bonding to bulk Ni3Al. Undoped and boron-poor regions of the grain boundary have bonding similar to that in pure Ni (less filled Ni d bands) which suggests these Ni atoms have fewer Al nearest neighbors and weaker Ni-Al bonding than in bulk Ni3Al. Finally, radiation damage was seen to occur in freshly prepared specimens at beam voltages as low as 100 kV but could be prevented by carbon coating the samples.
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Category : Nuclear energy
Languages : en
Pages : 874
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Category : Science
Languages : en
Pages : 1662
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Author: United States. Energy Research and Development Administration
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Category : Medicine
Languages : en
Pages : 818
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