scholarly journals Microstructural changes and formability of Al–Mg ultrafine-grained aluminum plates processed by multi-turn ECAP and upsetting

2021 ◽  
pp. 142202
Author(s):  
Marta Ciemiorek ◽  
Witold Chromiński ◽  
Cezary Jasiński ◽  
Małgorzata Lewandowska
Keyword(s):  
Microstructural Changes ◽  
Ultrafine Grained ◽  
Aluminum Plates

Microstructural Changes with Annealing of a Nanostructured Al Alloy Severely Plastic Deformed by Four-Layer Stack Accumulative Roll-Bonding Process

2020 ◽  
Vol 20 (7) ◽  
pp. 4419-4422
Author(s):  
Seong-Hee Lee
Keyword(s):  
Aluminum Alloy ◽  
Annealing Temperature ◽  
Rolling Direction ◽  
Alloy Sheet ◽  
Al Alloy ◽  
Heterogeneous Structure ◽  
Microstructural Changes ◽  
Ultrafine Grained ◽  
Coarse Grains ◽  
Ultrafine Grained Microstructure

Microstructural changes with annealing of a nanostructured complex aluminum alloy fabricated by 3 cycles of four-layer stack ARB process using different Al alloys were investigated in detail. The four-layer stack ARB process using AA1050, AA5052 and AA6061 alloy sheets was performed up to 3 cycles without a lubricant at room temperature. The sample fabricated by the ARB is a multi-layer aluminum alloy sheet in which the AA1050, AA5052 and AA6061 aluminum alloys are alternately stacked to each other. The layer thickness of each alloy became thinner and elongated to the rolling direction with the number of ARB cycles. The grain size decreased with increasing of the number of ARB cycles, and became about 160 nm in thickness after 3 cycles. The complex Al alloy still showed ultrafine grained microstructure to annealing temperature of 300 °C, but it had a heterogeneous structure containing both the ultrafine grains and the coarse grains due to an occurrence of discontinuous recrystallization after 350 °C.

scholarly journals Application of Electron Beam Welding Technique for Joining Ultrafine-Grained Aluminum Plates

2021 ◽  
Author(s):  
Marta Orłowska ◽  
Florian Pixner ◽  
Kamil Majchrowicz ◽  
Norbert Enzinger ◽  
Lech Olejnik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Solid State ◽  
Electron Beam Welding ◽  
High Interest ◽  
Ultrafine Grained ◽  
Ultrafine Grained Materials ◽  
Aluminum Plates ◽  
Welding Technique

AbstractThe present study is the first attempt to join ultrafine-grained materials by electron beam welding. The aim of the study was to check the feasibility and effectiveness of this type of welding for thermally unstable materials. The results obtained are of high interest, while the welding did cause a decline in mechanical properties, the results were comparable to those obtained using solid-state welding, but with a significant advantage of narrower fusion- and heat-affected zones.

Mechanical properties and microstructural changes of ultrafine-grained AA6063T6 during high-cycle fatigue

2006 ◽  
Vol 97 (10) ◽  
pp. 1392-1400 ◽  
Author(s):  
Matthias Hockauf ◽  
Lothar W. Meyer ◽  
Thorsten Halle ◽  
Corinna Kuprin ◽  
Michael Hietschold ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Microstructural Changes ◽  
Ultrafine Grained

scholarly journals Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel

2013 ◽  
Vol 48 (13) ◽  
pp. 4620-4625 ◽  
Author(s):  
Zbigniew Oksiuta ◽  
Pawel Kozikowski ◽  
Malgorzata Lewandowska ◽  
Masato Ohnuma ◽  
Koppoju Suresh ◽  
...  
Keyword(s):  
Ferritic Steel ◽  
Microstructural Changes ◽  
Ultrafine Grained

Forming Ability of Ultrafine‐Grained Aluminum Plates Processed by Incremental Equal Channel Angular Pressing

2019 ◽  
Vol 21 (10) ◽  
pp. 1900473
Author(s):  
Marta Ciemiorek ◽  
Piotr Bartkowski ◽  
Witold Chromiński ◽  
Lech Olejnik ◽  
Małgorzata Lewandowska
Keyword(s):  
Equal Channel Angular Pressing ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Aluminum Plates

Phenomena Associated with Oxygen in Titanium

1967 ◽  
Vol 25 ◽  
pp. 310-311
Author(s):  
E. U. Lee ◽  
P. A. Garner ◽  
J. S. Owens
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Microscope ◽  
Microstructural Changes ◽  
Electrolytic Polishing ◽  
Interstitial Impurities ◽  
Thin Foils ◽  
Transmission Electron ◽  
Iodide Titanium ◽  
Alpha Titanium

Evidence for ordering (1-6) of interstitial impurities (O and C) has been obtained in b.c.c. metals, such as niobium and tantalum. In this paper we report the atomic and microstructural changes in an oxygenated c.p.h. metal (alpha titanium) as observed by transmission electron microscopy and diffraction.Oxygen was introduced into zone-refined iodide titanium sheets of 0.005 in. thickness in an atmosphere of oxygen and argon at 650°C, homogenized at 800°C and furnace-cooled in argon. Subsequently, thin foils were prepared by electrolytic polishing and examined in a JEM-7 electron microscope, operated at 100 KV.

Tensile Creep of Y-Si3N4: II. Cavitation

1991 ◽  
Vol 49 ◽  
pp. 972-973 ◽  
Author(s):  
B. J. Hockey ◽  
S. M. Wiederhorn
Keyword(s):  
Silicon Nitride ◽  
Creep Rupture ◽  
Tensile Creep ◽  
Sintering Aids ◽  
Microstructural Changes

ATEM has been used to characterize three different silicon nitride materials after tensile creep in air at 1200 to 1400° C. In Part I, the microstructures and microstructural changes that occur during testing were described, and consistent with that description the designations and sintering aids for these materials were: W/YAS, a SiC whisker reinforced Si3N4 processed with yttria (6w/o) and alumina (1.5w/o); YAS, Si3N4 processed with yttria (6 w/o) and alumina (1.5w/o); and YS, Si3N4 processed with yttria (4.0 w/o). This paper, Part II, addresses the interfacial cavitation processes that occur in these materials and which are ultimately responsible for creep rupture.

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