Application of the Continuous Rheoconversion Process (CRP) to Low Temperature HPDC-Part I: Microstructure

2006 ◽  
Vol 116-117 ◽  
pp. 402-405 ◽  
Author(s):  
Qin Yue Pan ◽  
Stuart Wiesner ◽  
Diran Apelian
Keyword(s):  
Low Temperature ◽  
Scale Up ◽  
Microstructural Characterization ◽  
Industrial Applications ◽  
Primary Phase ◽  
Heat Extraction ◽  
Initial Stage ◽  
Fraction Solid ◽  
Die Castings

The continuous rheoconversion process (CRP) is a novel slurry-on-demand process that was developed at MPI/WPI in 2002. The process is based on a passive liquid mixing technique in which the nucleation and growth of the primary phase are controlled using a specially designed “reactor”. The reactor provides heat extraction, copious nucleation, and forced convection during the initial stage of solidification, thus leading to the formation of globular structures. This paper presents our recent work on the scale-up of the CRP for industrial applications. Specifically, we demonstrate an important application of the CRP to low temperature (low fraction solid) HPDC. In Part I of this paper, we present salient results on microstructural characterization of CRP processed castings vs. conventional die castings.

Application of the Continuous Rheoconversion Process (CRPTM) to Low Temperature HPDC-Part II: Alloy Development & Validation

2006 ◽  
Vol 116-117 ◽  
pp. 64-67 ◽  
Author(s):  
Stuart Wiesner ◽  
Qin Yue Pan ◽  
Diran Apelian
Keyword(s):  
Low Temperature ◽  
Scale Up ◽  
Nucleation And Growth ◽  
Industrial Applications ◽  
Primary Phase ◽  
Heat Extraction ◽  
Alloy Development ◽  
On Demand ◽  
Initial Stage ◽  
Thermodynamic Simulations

The continuous rheoconversion process (CRPTM) is a novel slurry-on-demand process that was developed at MPI/WPI in 2002. The process is based on a passive liquid mixing technique in which the nucleation and growth of the primary phase are controlled using a specially designed “reactor”. The reactor provides heat extraction, copious nucleation, and forced convection during the initial stage of solidification, thus leading to the formation of globular structures. This paper presents our recent work on the scale-up of the CRPTM for industrial applications. In Part II of this paper, we present salient results on alloy optimization via thermodynamic simulations, as well as validation results obtained from industrial Beta trials.

MICROSTRUCTURAL AND MECHANICAL PROPERTY CHARACTERISTICS OF BINARY Ni-Ge ALLOYS

1996 ◽  
Vol 10 (23) ◽  
pp. 1111-1122
Author(s):  
Y. JIN ◽  
M.C. CHATURVEDI
Keyword(s):  
Mechanical Property ◽  
Intermetallic Compound ◽  
Industrial Applications ◽  
Phase Method ◽  
Ordered Structure ◽  
High Temperature Materials ◽  
Initial Stage ◽  
Reasonable Choice ◽  
Property Characterization

Polycrystalline Ni 3 Ge intermetallic compound displays very poor ductility due to its weak grain boundary cohesion. In addition, its ductility cannot be improved by the boron doping method although this technique has proved quite effective in a similar Ni 3 Al intermetallic compound. Therefore, dual phase method seems to be a reasonable choice for developing advanced Ni–Ge based high temperature materials with a potential for industrial applications. In this communication, the recent progress in the microstructural and mechanical property characterization of binary Ni–Ge alloys has been reviewed. In addition to the rapid precipitation of fine Ni3Ge particles in the Ni solid solution, the spinodal decomposition has been observed to occur in the initial stage of aging at 873 K, while vacancy-induced short range ordered structure was found in the naturally aged alloys. The elastic constants of Ni 3 Ge single crystal at various annealing temperatures have been also determined.

Microstructural characterization of low-temperature grown GaMnN on GaAs(0 0 1) substrates by plasma-assisted MBE

2007 ◽  
Vol 22 (10) ◽  
pp. 1131-1139 ◽  
Author(s):  
Y Han ◽  
M W Fay ◽  
P D Brown ◽  
S V Novikov ◽  
K W Edmonds ◽  
...  
Keyword(s):  
Low Temperature ◽  
Microstructural Characterization

Microstructural characterization of Y-Ba-Cu-O laser deposited with high deposition rates on SrTiO3

1990 ◽  
Vol 48 (4) ◽  
pp. 56-57
Author(s):  
T.S. Ravi ◽  
R. Ramesh ◽  
D.M. Hwang ◽  
X.D. Wu ◽  
A. Inam ◽  
...  
Keyword(s):  
Thin Films ◽  
Microstructural Characterization ◽  
Industrial Applications ◽  
Laser Deposition ◽  
Processing Conditions ◽  
Deposition Rates ◽  
X Ray ◽  
Very High

As the technique of pulsed-laser deposition of YBa2Cu3O7−x (YBCO) matures, it is important to be able to have economically feasible processing conditions for future industrial applications such as microelectronics. Very high quality thin films of YBCO (with excellent Tc and Jc) have been consistently obtained for low deposition rates, such as 0.3Å/sec. However at this rate it takes at least two hours to produce a film 2000Å thick. While the quality of the film grown is of prime importance, it would be economically advantageous if the film can be grown much faster without much loss in quality. The objective of this study is to microstructurally characterize, using a combination of microdiffraction, X-ray microanalysis and HREM, thin films of YBCO prepared with higher deposition rates.

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