Microstructural characterization of alloyed palladium coated copper wire under high temperature

2021 ◽  
Vol 120 ◽  
pp. 114125
Author(s):  
Motoki Eto ◽  
Noritoshi Araki ◽  
Takashi Yamada ◽  
Masaaki Sugiyama ◽  
Shinji Fujimoto
Keyword(s):  
High Temperature ◽  
Copper Wire ◽  
Microstructural Characterization

On the High-Temperature Plasticity of Ceria-Doped Zirconia Nanostructured Polycrystals

2009 ◽  
Vol 423 ◽  
pp. 61-66 ◽  
Author(s):  
S. de Bernardi-Martín ◽  
E. Zapata-Solvas ◽  
D. Gómez-García ◽  
Arturo Domínguez-Rodríguez ◽  
F.J. Guzmán-Vázquez ◽  
...  
Keyword(s):  
High Temperature ◽  
Constitutive Equation ◽  
High Temperatures ◽  
Microstructural Characterization ◽  
Zirconia Ceramic ◽  
Post Mortem ◽  
High Temperature Annealing ◽  
Molar Composition ◽  
Creep Regime

Ceria-zirconia ceramic alloys with the following molar composition: 0.12CeO2-0.88ZrO2 have been sintered by high-temperature annealing. Monolithic specimens haven been crept in compression at high temperatures. Creep experiments have been rationalized to an empirical constitutive equation which is consistent with a classical Ashby-Verrall creep regime. This result has been assessed through microstructural characterization of as-received and post-mortem specimens. A pure Ashby-Verrall creep is contrary to the conventional mechanism controlling creep in other zirconia alloys. A discussion on the explanation for such mechanism is outlined.

Microstructure and microtexture of a Nb-16%Si (DS) Alloy

1995 ◽  
Vol 53 ◽  
pp. 122-123
Author(s):  
J. A. Sutliff ◽  
B. P. Bewlay
Keyword(s):  
High Temperature ◽  
Directional Solidification ◽  
Room Temperature ◽  
Microstructural Characterization ◽  
Crystallographic Analysis ◽  
Directionally Solidified ◽  
Heat Treated ◽  
Other Orientation

In-situ composite Nb-Si alloys have been studied by several investigators as potential high temperature structural materials. The two major processing routes used to fabricate these composites are directional solidification and extrusion of arc-cast solidified ingots. In both cases a stable microstructure of primary Nb dendrites in a eutectoid of Nb and Nb5Si3 phases is developed after heat treatment. The Nb5Si3 phase is stable at room temperature and forms as a decomposition product of the high temperature Nb3Si phase. The anisotropic microstructures developed by both directional solidification and extrusion require evaluation of the texture to fully interpret the fracture and other orientation dependent mechanical behavior of these composites.In this paper we report on the microstructural characterization of a directionally solidified (DS) and heat treated Nb-16 at.%Si alloy. The microtexture of each of the phases (Nb, Nb5Si3) was determined using the Electron BackScattering Pattern (EBSP) technique for electron diffraction in the scanning electron microscope. A system employing automatic diffraction pattern recognition, crystallographic analysis, and sample or beam scanning was used to acquire the microtexture data.

Microstructural characterization of a Cr2Nb-Nb(Cr) microlaminate composite

1994 ◽  
Vol 52 ◽  
pp. 706-707
Author(s):  
M. Larsen ◽  
R. G. Rowe ◽  
D. W. Skelly
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Metal Layer ◽  
Intermetallic Layer ◽  
Weight Ratio ◽  
Microstructural Characterization ◽  
Aircraft Engine ◽  
Intrinsic Defect ◽  
Lamellar Thickness

The thrust to weight ratio of an aircraft engine is limited by the density and elevated temperature performance of high temperature structural materials. Many material systems are currently under investigation as potential next generation engine materials. Microlaminate composites consisting of alternating layers of a ductile refractory metal for toughening and a high temperature intermetallic compound for elevated temperature strength have applicability in aircraft engine turbines. The lamellar thickness of such a composite must be small because the intrinsic defect size, a crack across the intermetallic layer, will be controlled by the intermetallic layer thickness. The microstructural characterization of a Cr2Nb-Nb(Cr) microlaminate composite produced by Magnetron® sputtering was carried out by cross-sectional TEM. Both the as-deposited composite and one heat treated at 1200°C for two hours were examined.Figure 1 shows a micrograph of the as-deposited composite. The metal and intermetallic layers are 2um thick. The metal layer has a composition in atomic percent of 95% Nb and 5% Cr.

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