Heat Treatment Effect on the Behavior of Oxide Particles in Mechanically Alloyed Oxide Dispersion Strengthened Powders

2017 ◽  
Vol 9 (12) ◽  
pp. 2126-2130 ◽  
Author(s):  
Ga Eon Kim ◽  
Sanghoon Noh ◽  
Suk Hoon Kang ◽  
Young Do Kim ◽  
Tae Kyu Kim
Keyword(s):  
Heat Treatment ◽  
Treatment Effect ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Mechanically Alloyed ◽  
Oxide Particles

scholarly journals Production of Oxide Dispersion Strengthened Mg-Zn-Y Alloy by Equal Channel Angular Pressing of Mechanically Alloyed Powder

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 679 ◽  
Author(s):  
Keng-Liang Ou ◽  
Chia-Chun Chen ◽  
Chun Chiu
Keyword(s):  
Equal Channel Angular Pressing ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Dispersion Strengthening ◽  
Mechanically Alloyed ◽  
Angular Pressing ◽  
Lpso Structure ◽  
Gas Atmosphere ◽  
Solution Strengthening ◽  
Oxide Particles

Mg-Zn-Y alloys with long-period stacking ordered structures (LPSO) have attracted attention due to their excellent mechanical properties. In addition to the LPSO structure, Mg alloys can also be strengthened by oxide particles. In the present study, oxide dispersion strengthened Mg97Zn1Y2 (at%) alloys were prepared by equal channel angular pressing (ECAP) of mechanical alloyed (MA) powder under an oxygen gas atmosphere. The 20-h-MA powder had a particle size of 28 μm and a crystallite size of 36 nm. During the MA process followed by ECAP, an Mg matrix with dispersed Y2O3 (and MgO) particles was formed. The alloy processed by ECAP exhibited a hardness of 110 HV and a compressive strength of 185 MPa. Compared to pure Mg, the increased hardness was due to the dispersion strengthening of Y2O3 and MgO particles and solution strengthening of Zn and Y.

The Fine Microstructure of a Mechanically Alloyed Oxide Dispersion Strengthened Solid Solution

1977 ◽  
Vol 35 ◽  
pp. 264-265
Author(s):  
Jordi Marti ◽  
John E. Stulga ◽  
John K. Tien
Keyword(s):  
Solid Solution ◽  
Stress Rupture ◽  
Oxide Dispersion Strengthened ◽  
Nickel Base Superalloy ◽  
High Temperature Strength ◽  
Oxide Dispersion ◽  
Mechanically Alloyed ◽  
Base Solid Solution ◽  
Oxide Particles ◽  
Nickel Base

A recent development in powder metallurgy technology, known as mechanical alloying (1), can find applications in alloys which cannot be manufactured by conventional processes, due to high melting temperatures, chemical incompatibility of constituents in the melt, or high reactivity. The process has been utilized in the production of a nickel-base superalloy and a nickel-base solid solution which contain dispersions of fine and inert oxide particles for high temperature strength. As part of a study of the creep and stress rupture behavior of these alloys, the as-received and crept microstructures have been examined using the transmission electron microscope. This note discusses the fine-scale microstructure of the mechanically alloyed oxide dispersion strengthened (ODS) nickel-base solid solution.The alloy has a nominal chemical composition in weight percent of Ni - 20Cr - 0.5Ti - 0.3A1 with O.6Y2O3 oxide particles.

Fine Microstructure of a Mechanically Alloyed Oxide Dispersion Strengthened Nickel-Base Superalloy

1977 ◽  
Vol 35 ◽  
pp. 298-299
Author(s):  
Jordi Marti ◽  
Timothy E. Howson ◽  
David Kratz ◽  
John K. Tien
Keyword(s):  
Solid Solution ◽  
Volume Fraction ◽  
Stress Rupture ◽  
Oxide Dispersion Strengthened ◽  
Solid Solution Alloy ◽  
Oxide Dispersion ◽  
Creep And Stress Rupture ◽  
Mechanically Alloyed ◽  
Fine Microstructure ◽  
Nickel Base

The previous paper briefly described the fine microstructure of a mechanically alloyed oxide dispersion strengthened nickel-base solid solution. This note examines the fine microstructure of another mechanically alloyed system. This alloy differs from the one described previously in that it is more generously endowed with coherent precipitate γ forming elements A1 and Ti and it contains a higher volume fraction of the finely dispersed Y2O3 oxide. An interesting question to answer in the comparative study of the creep and stress rupture of these two ODS systems is the role of the precipitate γ' in the mechanisms of creep and stress rupture in alloys already containing oxide dispersoids.The nominal chemical composition of this alloy is Ni - 20%Cr - 2.5%Ti - 1.5% A1 - 1.3%Y203 by weight. The system receives a three stage heat treatment-- the first designed to produce a coarse grain structure similar to the solid solution alloy but with a smaller grain aspect ratio of about ten.

scholarly journals Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature

2017 ◽  
Vol 493 ◽  
pp. 180-188 ◽  
Author(s):  
N.H. Oono ◽  
S. Ukai ◽  
S. Hayashi ◽  
S. Ohtsuka ◽  
T. Kaito ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Oxide Particles

Y2O3 Morphology in an Oxide Dispersion Strengthened FeAl Alloy Prepared by Mechanical Alloying

1996 ◽  
Vol 460 ◽  
Author(s):  
B. J. Inkson ◽  
P. L. Threadgill
Keyword(s):  
Mechanical Alloying ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Feal Alloy ◽  
Oxide Particles

ABSTRACTThe microstructure of an oxide dispersion strengthened FeAl (Zr,B) alloy, manufactured by mechanical alloying then extrusion, has been examined by HREM. Y2O3 is dispersed throughout the FeAl matrix as particles, ranging in size from 5nm upwards, which are effective in pinning the bulk dislocations. Although in the main the observed oxide particles are irregular in morphology, a significant minority of particles exhibit faceted surfaces. In particular, the facets of the Y2O3 particles are observed to coincide with {100}B2, {110}B2 and {112}B2 planes of the surrounding bulk FeAl matrix. In addition, HREM imaging reveals uncoupled 1/2<111>FeAl superpartial dislocations lying a few nanometres from some of the FeAl - Y2O3 interfaces.

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