Blar i NTNU Open på tidsskrift "Materials Science & Engineering: A"
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Microstructure and mechanical properties of the AZ31/GW103K bimetal composite rods fabricated by co-extrusion
(Peer reviewed; Journal article, 2022)The AZ31/GW103K bimetal composite rods consisting of a soft AZ31 sleeve and a hard GW103K core were fabricated by the co-extrusion at 350 °C, 400 °C and 450 °C, and their microstructure and mechanical properties were ... -
Microstructure and nanomechanical behavior of an additively manufactured (CrCoNiFe)94Ti2Al4 high-entropy alloy
(Peer reviewed; Journal article, 2021)Recent substantial studies indicate that high-entropy alloys (HEAs) possess superior mechanical performance, including exceptional strength, high creep resistance, etc. However, additive manufacturing (AM), a burgeoning ... -
Microstructure and strength of nano-/ultrafine-grained carbon nanotube-reinforced titanium composites processed by high-pressure torsion
(Journal article; Peer reviewed, 2018)Nano-/ultrafine-grained carbon nanotube-reinforced titanium (CNT/Ti) composites were synthesized by ball milling and high pressure torsion (HPT) at room temperature. The effects of the number of HTP rotations and the weight ... -
Microstructure evolution of commercial pure titanium during equal channel angular pressing
(Journal article; Peer reviewed, 2010)The microstructure development of commercially pure titanium during 3 and 4 passes of equal channel angular pressing (ECAP) has been investigated in detail by optical microscopy and electron backscattered diffraction (EBSD). ... -
On the hydrogen embrittlement behavior of nickel-based alloys: Alloys 718 and 725
(Peer reviewed; Journal article, 2020)Nickel-based superalloys have attracted immense attention in the oil and gas industry due to their outstanding combination of mechanical properties and corrosion resistance. In corrosive service environment, hydrogen ... -
On the long-term correlations in the twinning and dislocation slip dynamics
(Peer reviewed; Journal article, 2020)The present work aims at gaining new insights into the dynamics of the dislocation slip and twinning processes, which govern the majority of possible scenarios of plastic deformation in structural metals and alloys. Using ... -
On the role of hydrogen in stress corrosion cracking of magnesium and its alloys: Gas-analysis study
(Journal article; Peer reviewed, 2019)One of the main challenges impeding wider uptake of magnesium alloys by the industry is their poor resistance to general corrosion and stress-corrosion cracking (SCC), the nature of which is not fully understood. Although ... -
On the role of pre-exposure time and corrosion products in stress-corrosion cracking of ZK60 and AZ31 magnesium alloys
(Peer reviewed; Journal article, 2021)Pre-exposure of Mg alloys to corrosive media causes their embrittlement, which has been long associated with diffusible hydrogen penetrating into the metal. The time of the pre-exposure was suggested to promote embrittlement ... -
A phenomenological model of deformation twinning kinetics
(Peer reviewed; Journal article, 2021)Inspired by the classical Olson and Cohen model for martensitic phase transformations, a simple phenomenological model of the deformation twinning kinetics is proposed with account for twin-twin interactions. The model was ... -
A phenomenological model of twinning-mediated strain hardening
(Peer reviewed; Journal article, 2020)We present a model of strain-hardening in materials with twinning-mediated plasticity. While the model is largely phenomenological, it was motivated by microstructural considerations and can be claimed to be physically ... -
Plasticity in cryogenic brittle fracture of ferritic steels: Dislocation versus twinning
(Journal article; Peer reviewed, 2019)The sub-surface deformation structure after cryogenic (77 K) brittle fracture in a ferritic steel was characterized by scanning electron microscopy (SEM). Twin-like structures were found in many grains below the fracture ... -
Precipitation behavior in an Al-Cu-Mg-Si alloy during ageing
(Peer reviewed; Journal article, 2019)The precipitation behavior and aging response of an Al-4.9Cu-0.74Mg-0.51Si-0.48Mn-0.1Cr-0.08Ti-0.02Fe (wt. %) alloy was examined in detail after aging at 170 °C with different dwell times up to 96 h. Deformation by ... -
Precipitation behavior in an Al-Cu-Mg-Si alloy during ageing
(Peer reviewed; Journal article, 2019)The precipitation behavior and aging response of an Al-4.9Cu-0.74Mg-0.51Si-0.48Mn-0.1Cr-0.08Ti-0.02Fe (wt. %) alloy was examined in detail after aging at 170 °C with different dwell times up to 96 h. Deformation by ... -
Precipitation in an Al-Mg-Cu alloy and the effect of a low amount of Ag
(Journal article, 2016)Two high-purity aluminium alloys based on composition Al–3.0Mg–1.0Cu (wt%), one with added 0.4 wt% Ag, were compared up to 11 days ageing at 443 K by means of transmission electron microscopy and hardness measurements. The ... -
Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation
(Peer reviewed; Journal article, 2021)The hydrogen effect on a X65 carbon steel was investigated using in-situ electrochemical nanoindentation approach. The alterations in elastic behavior, pop-in load, and hardness under hydrogen-free and hydrogen-charged ... -
The processing route towards outstanding performance of the severely deformed Al–Mg–Mn-Sc-Zr alloy
(Journal article, 2021)Aiming at obtaining the enhanced mechanical properties profile for lightweight applications, bulk billets of the commercial 1570C aluminium alloy (Al–5Mg-0.18Mn-0.20Sc-0.08Zr, wt. %) with nanosized aluminides of transition ... -
Soft particles assisted grain refinement and strengthening of an Al-Bi-Zn alloy subjected to ECAP
(Journal article; Peer reviewed, 2017)With the aim to improve the strength of potential Pb-free Al-Bi based bearing alloys, an Al-6Bi-8Zn alloy was subjected to equal channel angular pressing (ECAP). To reveal the roles played by the soft Bi particles, an ... -
Strengthening and toughening mechanisms of an ultrafine grained Mg-Gd-Y-Zr alloy processed by cyclic extrusion and compression
(Journal article; Peer reviewed, 2017)Cyclic extrusion and compression (CEC) was implemented to process the Mg-Gd-Y-Zr alloy. Microstructure characters, including the matrix grain, precipitates and texture evolution, were tried to correlate with the mechanical ... -
Strengthening mechanisms in ultrafine grained Al-Mg-Si alloy processed by hydrostatic extrusion – Influence of ageing temperature
(Journal article, 2016)Microstructure of hydrostatically extruded Al-Mg-Si alloy was studied by the combination of electron backscattered diffraction and transmission electron microscopy. Three different grain types which feature various defects ... -
Structure, Texture and Strength of Mg-5.8Zn-0.65Zr Alloy after Hot-to-Warm Multi-Step Isothermal Forging and Isothermal Rolling to Large Strains
(Journal article; Peer reviewed, 2018)Aiming at improving deformability of wrought Mg alloys, the commercial hot-pressed alloy MA14 (ZK60) was subjected to hot/warm severe plastic deformation (SPD) to a total true strain of 9. The processing schedule involved ...