Decomposition of the supersaturated solid solution in Ni-Cr-Fe-Nb-Al alloys and their heat treatment

1991 ◽  
Vol 33 (5) ◽  
pp. 376-379 ◽  
Author(s):  
G. I. Nosova ◽  
V. D. Plakhtii ◽  
N. A. Polyakova
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Supersaturated Solid Solution ◽  
Al Alloys

The Microstructural Peculiarities of Beryllium Bronze after Heat Treatment

2020 ◽  
Vol 989 ◽  
pp. 172-176
Author(s):  
V.R. Baraz ◽  
S.X. Estemirova ◽  
E.A. Ishina
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Supersaturated Solid Solution ◽  
Strength Properties ◽  
Micro Hardness ◽  
Beryllium Bronze ◽  
Phase Type ◽  
Solid Solution Matrix ◽  
Χ Phase ◽  
Solution Matrix

In this article, the microstructural peculiarities and properties of dispersion-hardened beryllium bronze with Ni and Ti are studied after quenching (780 °C) in a supersaturated solid solution and aging (320 °C, 3h). Decomposition of the α-solid solution matrix is implemented by means of an intermittent reaction with a primary allocation intermetallic χ-phase (type Be12Ti) with a VCT-lattice. It is shown that the strength properties (yield strength, micro-hardness) of the alloy more than double after aging.

scholarly journals Microstructure and Service Properties of Copper Alloys

2016 ◽  
Vol 61 (3) ◽  
pp. 1277-1282
Author(s):  
M. Polok-Rubiniec ◽  
J. Konieczny ◽  
K. Labisz ◽  
A. Włodarczyk-Fligier
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Plastic Deformation ◽  
Wear Resistance ◽  
Cold Rolling ◽  
Cold Working ◽  
Supersaturated Solid Solution ◽  
Copper Alloys ◽  
Test Material ◽  
Cold Plastic Deformation

Abstract This elaboration shows the effect of combined heat treatment and cold working on the structure and utility properties of alloyed copper. As the test material, alloyed copper CuTi4 was employed. The samples were subjected to treatment according to the following schema: 1st variant – supersaturation and ageing, 2nd variant – supersaturation, cold rolling and ageing. The paper presents the results of microstructure, hardness, and abrasion resistance. The analysis of the wipe profile geometry was realized using a Zeiss LSM 5 Exciter confocal microscope. Cold working of the supersaturated solid solution affects significantly its hardness but the cold plastic deformation causes deterioration of the wear resistance of the finally aged CuTi4 alloy.

Precipitation of Phases in Al-Mg-Si-Cu Alloy with Sc and Zr Additions during Heat Treatment

2007 ◽  
Vol 130 ◽  
pp. 163-166 ◽  
Author(s):  
Lidia Lityńska-Dobrzyńska
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Cooling Rate ◽  
Supersaturated Solid Solution ◽  
Ageing Temperature ◽  
Spherical Particles ◽  
Preliminary Heat Treatment ◽  
Complete Dissolution ◽  
Cu Alloy ◽  
Copper Mould

In the present work the sequence of phases in Al-1%Mg-0.6%Si-1%Cu (in wt %) alloys with 0.4%Sc and 0.2%Zr additions during heat treatment has been studied. The investigated alloys were cast into copper mould to ensure high cooling rate during solidification and the retention of Sc and Zr in the supersaturated solid solution. Two−step preliminary heat treatment was applied: the annealing at temperature 300°C or 350°C followed by quenching from 540°C to water. The precipitation of the Q′ and Al3Sc phases has been observed during the first step of annealing. The annealing at 540°C has led to complete dissolution of the Q′ particles and growth of the spherical particles of the Al3Sc phase. The increase of hardness during subsequent ageing at 165°C (typical ageing temperature of the 6xxx alloys) has been caused by the formation of needle-like Q′ phase which coexist with Al3Sc precipitates.

Structural Evolution of Al-Cr Alloy during Processing

2008 ◽  
Vol 138 ◽  
pp. 145-152 ◽  
Author(s):  
Dalibor Vojtěch ◽  
Alena Michalcová ◽  
Pavel Novák
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Phase Transformations ◽  
Elevated Temperatures ◽  
Supersaturated Solid Solution ◽  
Structural Evolution ◽  
Hot Extrusion ◽  
Light Components ◽  
Rapidly Solidified

Aluminium-chromium based alloys are promising candidates for manufacture of light components exposed to elevated temperatures. The work describes properties of Al-6.0wt.%Cr- 2.1wt.%Fe-0.5wt.%Ti alloy. The rapidly solidified powder was prepared by the pressure nitrogen melt atomization. The powder was then subject to heat treatment in order to investigate solid state phase transformations. Compaction of the powder was carried out by hot extrusion after preheating at 450 °C. Microstructure, phase composition and structural transformations on heat treatment were investigated in the as-atomized powder, as well as in the as-extruded alloy. It is found that metastable state of the rapidly solidified powder is characterized by presence of quasi-crystalline phases and supersaturated solid solution. Heating before and during the hot extrusion induces decomposition of the supersaturated solid solution and quasicrystalline to crystalline phase transformations. The hot extruded alloy has a refined recrystallized structure that remains very stable aven after long-term annealing at 400 °C. Mechanical properties of the extruded alloy are discussed in terms of strengthening mechanisms.

Structural Evolution of Fe Rich Fe-Al Alloys During Ball Milling and Subsequent Heat Treatment

1996 ◽  
Vol 457 ◽  
Author(s):  
H. G. Jiang ◽  
R. J. Perez ◽  
M. L. Lau ◽  
E. J. Lavernia
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Ball Milling ◽  
Structural Evolution ◽  
Al Alloys ◽  
Avrami Equation ◽  
Transformation Kinetics ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Kinetics Of

ABSTRACTX-ray diffraction (XRD) and differential scanning calorimetry (DSC) have been utilized to investigate the structural evolution of Fe rich Fe-Al alloys during ball milling. It is found that b.c.c. solid solutions can be formed either through ball milling alone or through ball milling together with heat treatment. Thermal diagrams of the milled Fe-Al powders reveal exothermic peaks corresponding to the formation of cc-Fe(Al) solid solution (in both Fe-4wt.%Al and Fe-10wt.%Al) and the formation of FeAl intermetallic compound (in Fe-10wt.%Al). The transformation kinetics of cc-Fe(Al) solid solution in Fe-4wt.%Al were found to follow the Johnson-Mehl-Avrami equation.

Grain Growth and Phase Formation in Ion Irradiated/Annealed Thin Ni-Al Alloys Films

1989 ◽  
Vol 157 ◽  
Author(s):  
Dale E. Alexander ◽  
Gary S. Was ◽  
Lynn E. Rehn
Keyword(s):  
Solid Solution ◽  
Grain Growth ◽  
Room Temperature ◽  
Supersaturated Solid Solution ◽  
Ion Irradiation ◽  
Al Alloys ◽  
Heat Of Mixing ◽  
Mixing Effect ◽  
Temperature Irradiation ◽  
Support Grid

ABSTRACTIon irradiation and annealing studies were performed on Ni, Ni-20 at.%Al multilayers and Ni-20 at.%Al co-evaporated thin films. Xe+ ions were used to irradiate the films and homogenize the multilayers at room temperature. Irradiation of alloy films formed a metastable, supersaturated solid solution of γ phase and an HCP phase. Ion induced grain growth occurred in all films. A factor of 2 greater growth was observed in Ni-Al multilayers compared with coevaporated films irradiated to the same dose. The enhancement is attributed to a heat of mixing effect. Post irradiation annealing of the mixed multilayers formed γ*, the morphology of which was dependent upon the presence of Cu in the films due to substrate mixing from the support grid.

scholarly journals Influence of Solution Heat Treatment on Structure and Mechanical Properties of ZnAl22Cu3 Alloy

2016 ◽  
Vol 61 (3) ◽  
pp. 1581-1586 ◽  
Author(s):  
R. Michalik ◽  
B. Chmiela
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Solution Heat Treatment ◽  
Supersaturated Solid Solution ◽  
Cast Alloy ◽  
Dendritic Structure ◽  
Alloy Hardness ◽  
Ε Phase ◽  
Phase Solution

Abstract The influence of solution heat treatment at 385°C over 10 h with cooling in water on the structure, hardness and strength of the ZnAl22Cu3 eutectoid alloy is presented in the paper. The eutectoid ZnAl22Cu3 alloy is characterized by a dendritic structure. Dendrites are composed of a supersaturated solid solution of Al in Zn. In the interdendritic spaces a eutectoid mixture is present, with an absence of the ε (CuZn4) phase. Solution heat treatment of the ZnAl22Cu3 alloy causes the occurrence of precipitates rich in Zn and Cu, possibly ε phase. Solution heat treatment at 385°C initially causes a significant decrease of the alloy hardness, although longer solution heat treatment causes a significant increase of the hardness as compared to the as-cast alloy.

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