Mohammad M. Hoseini-Athar

• Ph.D.
• PostDoc Position at KTH Royal Institute of Technology

This study compares the role of microstructure on post-punching fatigue properties in three advanced high-strength steels (AHSSs) with a high-strength low-alloy (HSLA) steel commonly used in heavy-duty truck chassis. Microstructure characterization, tensile testing, high cycle fatigue (HCF) testing, fatigue crack growth rate (FCGR) testing, and neu...

Multi-physics thermo-fluid modeling has been extensively used as an approach to understand melt pool dynamics and defect formation as well as optimizing the process-related parameters of laser powder-bed fusion (L-PBF). However, its capabilities for being implemented as a reliable tool for material design, where minor changes in material-related pa...

Microstructure, crystallographic texture, and mechanical properties of pure Mg, as a model hcp metal, were compared after processing by the two severe plastic deformation (SPD) techniques of equal channel angular pressing (ECAP) and simple shear extrusion (SSE). Both processes were performed on extruded bars at 250 °C for up to four passes, where t...

Microstructure, mechanical properties and superplastic behavior of Mg–2Gd–xZn (x = 0, 1, 2 and 3 wt%) alloys were investigated after extrusion and equal channel angular pressing (ECAP). After only 2 passes of ECAP, a homogenous fine-grained microstructure with a grain size of 2.33 μm and a high fraction of high-angle grain boundaries of 84 % were f...

Hot shear deformation behavior and optimum processing parameters of the binary Mg–xGd (x = 0.5, 1, and 2 wt%) alloys were studied through the development of constitutive equations and processing maps. Shear punch tests (SPT) were performed in the temperature range of 573–723 K and shear strain rate range of 1.7 × 10⁻²–1.3 × 10⁻¹ s⁻¹. It was observe...

Constrained groove pressing (CGP) was utilized to modify the texture and mechanical properties of extruded Mg–2Gd–3Zn sheet with typical TD (transverse direction)-split texture and pronounced mechanical anisotropy. The texture evolution sequence during CGP was studied and it was observed that a new 〈1¯21¯1〉 component with basal poles rotated 15°–30...

The effect of Zn content on grain growth kinetics of the fine-grained extruded Mg–2Gd–xZn (x = 0, 1, 2, 3 wt%) alloys was investigated by annealing of the as-extruded sheets in the temperature range of 623–723 K. Microstructural observations revealed that by adding 1 wt% Zn, the grain growth is significantly hindered, while increasing the Zn conten...

The effect of Zn content on the microstructure, texture, mechanical properties and strain-hardening behavior of extruded Mg–2Gd–xZn (x = 0, 1, 2 and 3 wt%) sheets was investigated. Evaluation of texture revealed that while all of the alloys exhibited weak textures, the texture component was altered from a basal to a non-basal one by the addition of...

The effect of Zn/Gd ratio on dynamic recrystallization (DRX) of Mg–2Gd–xZn (x = 0, 1, 2 and 3 wt%) alloys was investigated by shear punch tests in the temperature range of 623–723 K and shear strain rate range of 1.0×10–2–1.2×10–1 s–1. It was observed that at low Zn/Gd ratio, excessive co-segregation of Gd and Zn solute atoms retards recrystallizat...

The effect of Zn content on the hot deformation behavior of Mg–2Gd–xZn (x = 0, 1, 2 and 3 wt%) alloys was studied by performing shear punch tests (SPT) in the temperature range of 623–723 K and shear strain rate range of 1.0 × 10−2–1.2 × 10−1 s−1. Arrhenius-type constitutive equations were employed to investigate the hot deformation behavior. It wa...

In the current study, microstructural evolution and superplasticity of an extruded Mg–2wt% Gd sheet were studied after the constrained groove pressing (CGP) process. Microstructural observations by scanning electron microscopy and electron backscattered diffraction revealed that after 4 cycles of CGP, a rather homogeneous fine-grained microstructur...

Explosive welding is a well-known solid state method for joining similar and dissimilar materials. In the present study, tri-layered Al-Cu-Al laminated composites with different interface morphologies were fabricated by explosive welding and subsequent rolling. Effects of explosive ratio and rolling thickness reduction on the morphology of interfac...

In the present paper commercially pure Al billets were processed by equal channel angular extrusion (ECAE) up to 8 passes via route BC at room temperature. Electron back scattered diffraction (EBSD) were used to evaluate the microstructure of the aluminum. Moreover, the mechanical properties of the processed billets were investigated by tensile and...

Co-extrusion of strips of different strength and ductility is a process in the production of bimetal rods of desirable physical and mechanical properties. Equal channel angular extrusion (ECAE) is an innovative process for applying severe plastic deformation to materials. The present study is concerned with the ECAE of different bi-layer strips. De...

Equal channel angular extrusion (ECAE) is a promising technique for production of ultrafine grained (UFG) materials of few hundred nanometers size. In this research, the grain refinement of copper strip is accelerated to ultrafine range by sandwiching it between two aluminum strips and then subjecting the three strips to ECAE process simultaneously...