scholarly journals Abnormal Structure of Tantalum Carbide Phase in WC-TaC-Co Alloys

1968 ◽  
Vol 15 (1) ◽  
pp. 14-18 ◽  
Author(s):  
Kazo Murakami ◽  
Tsuneo Takeda ◽  
Nobujiro Tsuchiya
Keyword(s):  
Carbide Phase ◽  
Tantalum Carbide ◽  
Abnormal Structure ◽  
Co Alloys

Lorentz microscopy study of magnetic domain walls in Fe-Cr-Co alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 462-463
Author(s):  
Yalcin Belli
Keyword(s):  
Domain Walls ◽  
Magnetic Domain ◽  
Microscopy Study ◽  
Ferromagnetic Phase ◽  
Stable Phase ◽  
Magnetic Domains ◽  
Lorentz Microscopy ◽  
Magnetic Hardening ◽  
Electron Microscopes ◽  
Co Alloys

Fe-Cr-Co alloys have great technological potential to replace Alnico alloys as hard magnets. The relationship between the microstructures and the magnetic properties has been recently established for some of these alloys. The magnetic hardening has been attributed to the decomposition of the high temperature stable phase (α) into an elongated Fe-rich ferromagnetic phase (α1) and a weakly magnetic or non-magnetic Cr-rich phase (α2). The relationships between magnetic domains and domain walls and these different phases are yet to be understood. The TEM has been used to ascertain the mechanism of magnetic hardening for the first time in these alloys. The present paper describes the magnetic domain structure and the magnetization reversal processes in some of these multiphase materials. Microstructures to change properties resulting from, (i) isothermal aging, (ii) thermomagnetic treatment (TMT) and (iii) TMT + stepaging have been chosen for this investigation. The Jem-7A and Philips EM-301 transmission electron microscopes operating at 100 kV have been used for the Lorentz microscopy study of the magnetic domains and their interactions with the finely dispersed precipitate phases.

An atomic resolution study of a carbide phase in platinum

1992 ◽  
Vol 50 (1) ◽  
pp. 20-21
Author(s):  
M.J. Witcomb ◽  
M.A. O'Keefe ◽  
CJ. Echer ◽  
C. Nelson ◽  
J.H. Turner ◽  
...  
Keyword(s):  
Solid Solution ◽  
Carbon Atom ◽  
Carbide Phase ◽  
Structural Changes ◽  
Critical Role ◽  
Alloy System ◽  
Atomic Resolution ◽  
Excess Carbon ◽  
Interstitial Carbon ◽  
Resolution Study

Under normal circumstances, Pt dissolves only a very small amount of interstitial carbon in solid solution. Even so, an appropriate quench/age treatment leads to the formation of stable Pt2C {100} plate precipitates. Excess (quenched-in) vacancies play a critical role in the process by accommodating the volume and structural changes that accompany the transformation. This alloy system exhibits other interesting properties. Due to a large vacancy/carbon atom binding energy, Pt can absorb excess carbon at high temperatures in a carburizing atmosphere. In regions rich in carbon and vacancies, another carbide phase, Pt7C which undergoes an order-disorder reaction was formed. The present study of Pt carburized at 1160°C and aged at 515°C shows that other carbides in the PtxC series can be produced.

TEM INVESTIGATIONS OF WC-Co ALLOYS AFTER CREEP EXPERIMENTS

1986 ◽  
Vol 47 (C1) ◽  
pp. C1-685-C1-689 ◽  
Author(s):  
S. LAY ◽  
F. OSTERSTOCK ◽  
J. VICENS
Keyword(s):  
Co Alloys

The effect of HCP on the formation of twin boundaries and dislocations in Ni–Co alloys

2021 ◽  
Vol 29 ◽  
pp. 18-23
Author(s):  
Rui-bo Ma ◽  
Li-li Zhou ◽  
Yong-chao Liang ◽  
Qian Chen ◽  
Ze-an Tian ◽  
...  
Keyword(s):  
Twin Boundaries ◽  
Co Alloys

Sintering and densification mechanisms of tantalum carbide ceramics

2021 ◽  
Author(s):  
Chun Liu ◽  
Aiyang Wang ◽  
Tian Tian ◽  
Lanxin Hu ◽  
Wenchao Guo ◽  
...  
Keyword(s):  
Tantalum Carbide ◽  
Carbide Ceramics

Effect of the Ni content on the thermal and magnetic properties of Fe–Ni–Co alloys

2021 ◽  
Vol 261 ◽  
pp. 124215
Author(s):  
A. Paganotti ◽  
C.V.X. Bessa ◽  
C.C.S. Silva ◽  
E.B. Peixoto ◽  
J.G.S. Duque ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ni Content ◽  
Co Alloys
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