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Effect of pore structures on corrosion resistance of porous Ni_3Al intermetallics 被引量:5
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作者 吴靓 贺跃辉 +3 位作者 江垚 曾毅 肖逸峰 南博 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3509-3516,共8页
Porous Ni3Al intermetallics were fabricated by elemental powder reactive synthesis method, using carbamide powders as space holders. Corrosion behavior of porous Ni3Al intermetallics was investigated in a 6 mol/L KOH ... Porous Ni3Al intermetallics were fabricated by elemental powder reactive synthesis method, using carbamide powders as space holders. Corrosion behavior of porous Ni3Al intermetallics was investigated in a 6 mol/L KOH solution using electrochemical methods and immersion test. Effect of porous structures on the corrosion behavior of the porous Ni3Al intermetallics was studied. The results indicate that the porous Ni3Al intermetallics with higher porosities suffer more serious corrosion than the ones with lower porosities because the complicated interconnected porous structures and the large true surface areas exist in the samples with a higher porosity. But the corrosion rates of the porous Ni3Al intermetallics are not proportional to the true surface areas. The reason is that the pore size, pore size distribution and pore shape of the porous Ni3Al intermetallics change with the increasing porosity. All the porous Ni3Al intermetallics with different porosities exhibit excellent corrosion resistance in a strong alkali solution. 展开更多
关键词 nickel aluminide intermetallic CORROSION pore structure
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Grain size effect on cyclic oxidation of(TiB_2+TiC)/Ni_3Al composites 被引量:3
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作者 曹国剑 许虹宇 +2 位作者 郑镇洙 耿林 奈贺正明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1588-1593,共6页
(TiB2+TiC)/Ni3Al composites were prepared by mechanical alloying of elemental powders and subsequently spark plasma sintering.Microstructure of(TiB2+TiC)/Ni3Al composite sintered at 950°C was finer than tha... (TiB2+TiC)/Ni3Al composites were prepared by mechanical alloying of elemental powders and subsequently spark plasma sintering.Microstructure of(TiB2+TiC)/Ni3Al composite sintered at 950°C was finer than that of composite sintered at 1050°C.The influence of grain size on cyclic oxidation behavior was investigated.Cyclic oxidation results showed that the composite sintered at 950°C had smaller mass gains than the composite sintered at 1050°C.XRD and EDS results indicate that finer grain size is beneficial for increasing the oxidation resistance by improving the formation of a continuous TiO2 outer layer and a continuous Al2O3 inner layer on the surface of the composites sintered at 950°C. 展开更多
关键词 nickel aluminides COMPOSITES grain refinement OXIDATION mechanical alloying
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MICROSTRUCTURES AND MECHANICAL PROPERTIES OF β-NiA1CONTAINING α-Fe PRECIPITATES 被引量:2
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作者 W.H. Tian, A.L. Fan and M. Nemoto (Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China Sasebo National College of Technology, Okishin 1-1, Sasebo 857-1193, Japan) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第5期1023-1028,共6页
The microstructures of B2-ordered NiA1 containing α-Fe precipitates have been investigated in terms of transmission electron microscopy. Fine precipitation of α-Fe (bcc structure) occurs in NiA1 by aging around 973... The microstructures of B2-ordered NiA1 containing α-Fe precipitates have been investigated in terms of transmission electron microscopy. Fine precipitation of α-Fe (bcc structure) occurs in NiA1 by aging around 973K. The aging behavior was investigated by microhandness measurements and the temperature dependence of the yield strength of precipitate- comaining B2- ordered NiA1 was investigated by compression tests over the temperature range of 673-1273K. The fine precipitation of α-Fe was found to enhance greatly the low and intermediate temperature yield strength. When the deformation temperature is over 1073K, the strength of precipitate- containing NiA1 was comparable to ternary solid solution hardening NiA1-Fe. Dislocations bypass the particles during deformation and typical Orowan loops were observed surrounding the or-Fe particles after deformation. 展开更多
关键词 nickel aluminide based on NiA1 AGE-HARDENING mechanical property PRECIPITATE
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RECENT DEVELOPMENTS IN NiAl TECHNOLOGY FOR TURBINE AIRFOILS
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作者 R.Darolia (GE Aircraft Engines, 1 Neumann Way, Cincinnati, Ohio 45215) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1995年第Z1期625-632,共8页
NiAl alloys offer significant payoffs as structural materials in gas turbine applications due to high melting temperature low density,high thermal conductivity and excellent environmental resistance.Significant improv... NiAl alloys offer significant payoffs as structural materials in gas turbine applications due to high melting temperature low density,high thermal conductivity and excellent environmental resistance.Significant improvements in the material properties and processing have been achieved. The current approach also emphasizes design and test methodologies which can accept a material with limited ductility and damage tolerance. NiAl alloys have been successfully manufactured into a variety of turbine components. A high pressure turbine vane is currently being engine tested. 展开更多
关键词 nickel aluminide NIAL single crystal strength DUCTILITY TOUGHNESS
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PRECIPITATION BEHAVIOR OF Co PHASES IN B2-ORDERED(Ni,Co)Al COMPOUND
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作者 W.H. Tian, A.L. Fan and M. NemotoDepartment of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, ChinaSasebo National College of Technology, Okishin 1-1, Sasebo 857-1193, Japan Manuscript received 4 July 2001 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2002年第3期253-259,共7页
The precipitation behavior of Co phases in B2-ordered (Ni,Co)Al has been investigated in terms of transmission electron microscopy. Fine precipitation of fcc-Co occurs in (Ni,Co)Al by aging at temperature over 973K. T... The precipitation behavior of Co phases in B2-ordered (Ni,Co)Al has been investigated in terms of transmission electron microscopy. Fine precipitation of fcc-Co occurs in (Ni,Co)Al by aging at temperature over 973K. The orientation relationship between the fee-Co precipitates and the B2-(Ni,Co)Al matrix follows the Kurdjumow-Sachs (K-S) orientation relation. But when the aging temperature is under 873K the Co precipitates have a hcp crystal structure. The orientation relationship between the hep-Co precipitates and the B2-(Ni,Co)Al matrix follows the Burgers orientation relation. (Ni,Co)Al is hardened appreciably by the fine precipitation of both the fee-Co and hep-Co phases. The temperature dependence of the yield strength of precipitate-containing BS-ordered (Ni, Co)Al was investigated by compression tests over the range of 298-1273K. The fine precipitation of Co phases enhances greatly the low and intermediate temperature yield strength. When the deformation temperature was over 87SK, the strength of precipitate-containing (Ni, Co)Al is comparable to ternary dual-phase (Ni,Co)Al+Ni3Al alloy. 展开更多
关键词 nickel aluminides AGE-HARDENING mechanical properties PRECIPITATES
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