Rapid solidification processes of semiconductors from highly undercooled melts

2001 ◽  
Vol 304-306 ◽  
pp. 231-234 ◽  
Author(s):  
T. Aoyama ◽  
K. Kuribayashi
Keyword(s):  
Rapid Solidification ◽  
Solidification Processes ◽  
Undercooled Melts

Rapid Solidification by Plasma Deposition

1983 ◽  
Vol 30 ◽  
Author(s):  
D. Apelian
Keyword(s):  
Rapid Solidification ◽  
Plasma Deposition ◽  
Low Pressure ◽  
Structural Refinement ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Solidification Processes

ABSTRACTRapid solidification processes (RSP) have been reviewed. The structural refinement one may obtain via RSP and the consolidation methods which need to be utilized have also been reviewed. The merits of low pressure plasma deposition (LPPD) or rapid solidification by plasma deposition (RSPD) as a means of combining both the atomization and consolidation steps of RSP is highlighted. The applications and challenges of RSPD are discussed.

Microstructure evolution and plastic deformation of Ni47Co53 alloy under tension

CrystEngComm ◽  
2022 ◽  
Author(s):  
ruibo ma ◽  
Lili Zhou ◽  
Yong-Chao Liang ◽  
Ze-an Tian ◽  
Yun-Fei Mo ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Plastic Deformation ◽  
Rapid Solidification ◽  
Microstructural Evolution ◽  
Microstructure Evolution ◽  
Cooling Rates ◽  
Solidification Processes ◽  
Molecular Dynamics Methods

To investigate microstructural evolution and plastic deformation under tension conditions, the rapid solidification processes of Ni47Co53 alloy are first simulated by molecular dynamics methods at cooling rates of 1011, 1012...

Microstructural Characterization of Rapidly Solidified Ultrahigh Strength Aluminum Alloys

1998 ◽  
Vol 4 (S2) ◽  
pp. 98-99
Author(s):  
D. H. Ping ◽  
K. Hono ◽  
A. Inoue
Keyword(s):  
Rapid Solidification ◽  
Microstructural Characterization ◽  
Atom Probe ◽  
Probe Field ◽  
Amorphous Phases ◽  
Ultrahigh Strength ◽  
Icosahedral Phases ◽  
Transmission Electron ◽  
Solidification Processes ◽  
Rapidly Solidified

Recently, Inoue et al. succeeded in fabricating ultrahigh-strength Al-based alloys consisting of a nanoscale mixture of α-Al and amorphous phases or a mixture of a-Al, amorphous and icosahedral phases in Al-TM-Ce, Al-TM-Ln (TM: transition metals) and Al-Cr-Co-Ce systems by rapid solidification [1-3]. In order to understand the mechanism of the nanoscale microstructural evolution during the rapid solidification processes in these nanocomposite alloys, we have characterized the microstructures of rapidly solidified Al94.5Cr3Co1.5Ce1 and Al96V4Fe2 alloys by atom probe field ion microscopy (APFIM) and high resolution transmission electron microscopy (HREM).TEM investigations have revealed that the as-quenched Al94.5Cr3Co1.5Ce1 alloy is composed of a nanoscale mixture of amorphous and α-Al. A typical TEM bright field micrograph is shown in Fig. 1. The microdiffraction patterns taken at various locations in the darkly contrasted region have shown that the region consists of a few interconnected α-Al grains and many localized amorphous regions which are trapped within the Al grains.

Steel Particulate Made by Rapid Solidification Processes

1986 ◽  
Vol 29 (1) ◽  
pp. 33-36 ◽  
Author(s):  
K. Boulby ◽  
J. V. Wood
Keyword(s):  
Rapid Solidification ◽  
Solidification Processes

Rapidly Solidified Al-6Si-3Cu Alloy

2008 ◽  
Vol 570 ◽  
pp. 103-108 ◽  
Author(s):  
C. Triveño Rios ◽  
Claudemiro Bolfarini ◽  
Walter José Botta Filho ◽  
Claudio Shyinti Kiminami
Keyword(s):  
Rapid Solidification ◽  
X Ray Diffraction ◽  
Type Alloy ◽  
X Ray ◽  
Optical Scanning ◽  
Transmission Electron ◽  
Al2cu Phase ◽  
Solidification Processes ◽  
Dendritic Arm Spacing ◽  
Rapidly Solidified

Rapid solidification processes, RSP, are powerful tools to induce microstructural modifications, which may improve mechanical properties of alloys. In this paper the influence of rapid solidification on the formation of the undesirable brittle intermetallic compounds promoted by Si and Fe in Al-6Si-3Cu (A319-type) alloy have been investigated. The alloy have been casted using both conventional method and water-cooled wedge-copper mould. The microstructures have been evaluated by using a combination of X-ray diffraction, optical, scanning and transmission electron microscopy, and by Vickers microhardness. By increasing the cooling rate the length of the intermetallic β-Al5FeSi phase decreased, accompanying the same tendency of the secondary dendritic arm spacing. These results are accompanied by an increasing in hardness. Moreover, the formation and growth of the Al2Cu phase have been suppressed. These microstructural and hardness changes with the rapid solidification might be attributed to the increased solid solution content of the elements in the Al matrix.

Mechanical Properties Evaluation of a Spray Formed AA-6082 Aluminum Alloy

2010 ◽  
Vol 660-661 ◽  
pp. 503-509
Author(s):  
G. Siqueira ◽  
L.C.P.G. Safra ◽  
C.S. Mucsi ◽  
M.G. Fernandes ◽  
J.L. Rossi
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Rapid Solidification ◽  
Three Dimensional ◽  
Spray Forming ◽  
Single Step ◽  
Refined Microstructure ◽  
Solidification Processes ◽  
6082 Aluminum Alloy ◽  
Mechanical Properties Characterization

The spray forming technology combines in a single step the advantages of the rapid solidification techniques and high the productivity of the conventional casting processes, allowing obtention of preforms with a refined microstructure, almost without porosity and macrosegregation free. The development and research efforts are leading to interesting alloys and materials production. The rapid solidification processes inherent to the spray forming allow the production of alloys with different compositions from those obtained by conventional ingot processes. The aim of this work was to carry out mechanical properties characterization of a spray formed AA-6082 alloy. The hardness results are presented in different sections related to the height of the spray formed preform (in a three-dimensional arrangement). The material was evaluated in the as sprayed formed condition and after heat treatments of solution at 525 °C for 1 h and aging for 1 h, 10 h, 100 h and 500 h periods at 125 °C. It is showed that the spray formed AA 6082 aluminum alloy is very stable regarding hardness variation during aging.

The use of rapid solidification processes in search of new hard magnetic materials

1987 ◽  
Vol 65 (10) ◽  
pp. 1200-1209 ◽  
Author(s):  
G. C. Hadjipanayis
Keyword(s):  
Magnetic Materials ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Size Range ◽  
Amorphous Structure ◽  
Hard Magnetic Materials ◽  
Fine Grained ◽  
Solidification Processes ◽  
Cast Alloys ◽  
Melt Spinning Technique

Rapid solidification can be used to prepare amorphous and other metastable phases and special microstructures that cannot be obtained otherwise. The melt-spinning technique has been used for R15Fe77B8 and SmCo5−xNix alloys in a search for new hard magnetic materials. In R15Fe77B8, the as-quenched samples had an amorphous structure that on heating, crystallized into a fine-grained microstructure with R2Fe14B as the major phase. The grain-size range was 200–4000 Å, leading to coercivities that were much higher than those in sintered magnets. In SmCo5−xNix, melt-spinning produced both a fine-grained microstructure and a higher degree of atomic disorder, leading to substantially higher coercivity than was obtained in as-cast alloys.

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