Phase transformations and structure-property relationships in a rapidly solidified Ni-Al-Mo alloy

1993 ◽  
Vol 28 (7) ◽  
pp. 1946-1956 ◽  
Author(s):  
Sang Yul Lee ◽  
P. Nash
Keyword(s):  
Phase Transformations ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Rapidly Solidified

On the Structure-Property Relationship of Rapidly Solidified High Temperature Application Aluminium Alloys

1990 ◽  
Vol 186 ◽  
Author(s):  
A.J.S. Chowdhury ◽  
T. Sheppard
Keyword(s):  
High Temperature ◽  
High Temperature Strength ◽  
Structure Property ◽  
High Temperature Application ◽  
Structure Property Relationships ◽  
Structure Property Relationship ◽  
Temperature Application ◽  
Rapidly Solidified ◽  
Relationship Of ◽  
Strength And Ductility

AbstractThe phases responsible for high temperature strength and ductility of Al-Fe based alloys, specifically Al-Fe-Mo alloys, have yet to be unambiguously identified. The phases appear to vary slightly under different experimental and processing conditions. This poses some queries concerning the reproducibility of mechanical properties of these alloys. In this paper an attempt is made to address these points and focus on the structure-property relationships of Al-Fe-Mo and Al-Fe-V rapidly solidified powder alloys.

Structure/Property Relationships and Applications of Rapidly Solidified Aluminum Alloys

1981 ◽  
Vol 8 ◽  
Author(s):  
C. M. Adam
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Aluminum Alloys ◽  
Thermomechanical Processing ◽  
Structure Property ◽  
Turbine Engine ◽  
Structure Property Relationships ◽  
Plant Stage ◽  
Spherical Droplets ◽  
Rapidly Solidified

ABSTRACTDuring the last five years Pratt & Whitney Aircraft has developed rapid solidification powder metallurgy and consolidation techniques to produce advanced aluminum alloys. A centrifugal rotary atomization device with forced high velocity helium convective cooling has been developed to pilot-plant stage, to produce aluminum alloys of novel compositions for advanced gas turbine engine applications. Rapidly solidified aluminum alloys solidify as spherical droplets up to 100 μm diameter with cooling rates of 105 — 106 K/sec, and demonstrate new microstructural features which have been exploited to develop elevated temperature mechanical properties. Alloys have been developed for 400 — 500°F fan and compressor applications that have traditionally used titanium alloys, and this paper reviews the microstructural evolution of rapidly solidified structures during thermomechanical processing.

Structure/Property Relationships in a Rapidly Solidified and Annealed Ternary Iron Aluminide

1990 ◽  
Vol 213 ◽  
Author(s):  
B. Décamps ◽  
M.A. Gibsont ◽  
A.J. Morton ◽  
A. Wolfenden
Keyword(s):  
Room Temperature ◽  
Prolonged Exposure ◽  
Domain Size ◽  
Tensile Fracture ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Diffraction Patterns ◽  
The Times ◽  
Rapidly Solidified ◽  
Cast Condition

ABSTRACTRapidly solidified strips of Fe66.5-A128.5-Cr5 alloy with the addition of 0.5wt.% TiB2, were produced by planar flow strip casting. Correlations of the microstructure and room temperature mechanical properties were made for strips in the as-cast condition and after annealing at 1273K for periods up to 4hrs. The results showed that grain size, tensile strength, ductility, hardness and Young's modulus were very stable for the times investigated. Studies of tensile fracture surfaces revealed essentially 100% transgranular cleavage in the ascast strip with a greater tendency for intergranular failure after prolonged exposure to high temperatures. TEM studies of this alloy revealed diffraction patterns characteristic of DO3 ordering but the dislocations observed in both ascast and deformed specimens were those typical of the B2 structure without any extended APBs. This is attributed to the very fine DO3, domain size . At room temperature <111> slip is predominant.

Effect of K2O on structure–property relationships and phase transformations in Li2O–SiO2 glasses

2012 ◽  
Vol 32 (2) ◽  
pp. 291-298 ◽  
Author(s):  
Hugo R. Fernandes ◽  
Dilshat U. Tulyaganov ◽  
Ashutosh Goel ◽  
José M.F. Ferreira
Keyword(s):  
Phase Transformations ◽  
Structure Property ◽  
Structure Property Relationships

Structure-property relationships of PE/PP sandwiched films

1987 ◽  
Vol 45 ◽  
pp. 454-455
Author(s):  
J. Petermann ◽  
G. Broza ◽  
U. Rieck ◽  
A. Jaballah ◽  
A. Kawaguchi
Keyword(s):  
Mechanical Tests ◽  
Polymer Materials ◽  
Ionic Crystals ◽  
Structure Property ◽  
Polymer Systems ◽  
Structure Property Relationships ◽  
Oriented Films ◽  
Materials Used ◽  
Polymer Laminates ◽  
Heated Glass

Oriented overgrowth of polymer materials onto ionic crystals is well known and recently it was demonstrated that this epitaxial crystallisation can also occur in polymer/polymer systems, under certain conditions. The morphologies and the resulting physical properties of such systems will be presented, especially the influence of epitaxial interfaces on the adhesion of polymer laminates and the mechanical properties of epitaxially crystallized sandwiched layers.Materials used were polyethylene, PE, Lupolen 6021 DX (HDPE) and 1810 D (LDPE) from BASF AG; polypropylene, PP, (PPN) provided by Höchst AG and polybutene-1, PB-1, Vestolen BT from Chemische Werke Hüls. Thin oriented films were prepared according to the method of Petermann and Gohil, by winding up two different polymer films from two separately heated glass-plates simultaneously with the help of a motor driven cylinder. One double layer was used for TEM investigations, while about 1000 sandwiched layers were taken for mechanical tests.

Approaches for TEM imaging of cavitation in toughened nylon

1989 ◽  
Vol 47 ◽  
pp. 352-353
Author(s):  
Barbara A. Wood
Keyword(s):  
Morphological Characteristics ◽  
Structure Property ◽  
Polymer Systems ◽  
Selective Staining ◽  
Structure Property Relationships ◽  
Rubber Toughened ◽  
Shear Yield ◽  
Controversial Topic ◽  
Selection Of ◽  
Diamond Knife

A controversial topic in the study of structure-property relationships of toughened polymer systems is the internal cavitation of toughener particles resulting from damage on impact or tensile deformation.Detailed observations of the influence of morphological characteristics such as particle size distribution on deformation mechanisms such as shear yield and cavitation could provide valuable guidance for selection of processing conditions, but TEM observation of damaged zones presents some experimental difficulties.Previously published TEM images of impact fractured toughened nylon show holes but contrast between matrix and toughener is lacking; other systems investigated have clearly shown cavitated impact modifier particles. In rubber toughened nylon, the physical characteristics of cavitated material differ from undamaged material to the extent that sectioning of heavily damaged regions by cryoultramicrotomy with a diamond knife results in sections of greater than optimum thickness (Figure 1). The detailed morphology is obscured despite selective staining of the rubber phase using the ruthenium trichloride route to ruthenium tetroxide.

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