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"Strain hardening and strengthening mechanism of laser melting depositi" by Lisong Zhu, Keping Geng et al.

In order to develop the high-entropy alloy (HEA) with low cost and excellent mechanical properties for structural applications, the FeCoCrNiAl0.5 HEA has been fabricated by laser melting deposition, one of the advanced additive manufacturing methods. Strain hardening behaviour has been analysed and discussed using the combination of characterisation techniques. The LMD-ed FeCoCrNiAl0.5 had a true yield strength and strain of ∼463 MPa and 2.94%. Also, the true tensile strength of the LMD-ed FeCoCrNiAl0.5 reached 876 MPa, together with the ductility of 24.97% (engineering strain). The LMD-ed FeCoCrNiAl0.5 HEA exhibited a dual-phase structure of 93% face-centred cubic (FCC) phase and 6.9% ordered B2 phase. The phase boundary between the disordered FCC and ordered B2 phases played a key role in the barrier, which can block the movement of dislocations because of the lattice distortion, very large angle, and mismatch of the lattice. Dislocation pile-up and tangle caused the dislocation de ....

Fecocrnial 0 5 , High Entropy Alloy , Laser Melting Deposition , Hase Boundary , Train Hardening ,

"Development and design of ultra-high ductile magnesium phosphate cemen" by Hu Feng, Junhao Liang et al.

Magnesium phosphate cement (MPC) is one of the most promising binders to partially replace Portland cement to reduce carbon emissions. This study attempted to develop and design an ultra-high ductile MPC-based composite (UHDMC) using fly ash (FA) and silica fume (SF). Firstly, the macro-mechanical analysis of the UHDMC indicated that both the ultimate tensile stress and the ultimate tensile strain improved greatly when the additions of FA and SF replacing MPC were 30% and 20%, respectively. Compared to the addition of SF, the addition of FA resulted in a lower ultimate tensile stress but a higher ultimate tensile strain of UHDMC. Secondly, the micro-mechanical properties of the UHDMC were examined, and the stress-based and energy-based pseudo strain hardening indices (PSHσ and PSHJ, respectively) were calculated. It was found that both PSHσ and PSHJ of the UHDMC increased as the addition of SF or FA contents replacing MPC increased. Compared to the addition of SF, the addition of FA ....

Engineered Cementitious Composite , Fly Ash , Agnesium Phosphate Cement , Silica Fume , Train Hardening ,

"Mechanical properties of ambient cured fly ash-slag-based engineered g" by Zeya Li, M. Neaz Sheikh et al.

In this paper, low-strength polyvinyl alcohol (L-PVA) fibers, high-strength polyvinyl alcohol (H-PVA) fibers, and polyethylene (PE) fibers were used to prepare ambient cured fly ash-slag-based engineered geopolymer composites (EGC). The effects of fiber types and fiber volume fractions (1.5%, 1.75%, 2.0%, 2.25%, and 2.5%) on the compressive strength and tensile performance of EGC were evaluated. It was found that by increasing the fiber volume fraction from 1.5% to 2.5%, L-PVA fibers had the lowest influence, whereas PE fibers had the highest influence on the compressive strength of EGC. The optimum fiber volume fractions of L-PVA, H-PVA, and PE fibers were 1.75%, 2.25%, and 1.5%, respectively, for EGC to achieve the best tensile performance. Scanning electron microscope (SEM) investigations showed that the bonding performance of PE fibers to the EGC matrix was higher than those of L-PVA and H-PVA fibers to the EGC matrix. ....

Engineered Geopolymer Composite , Polyethylene Fiber , Polyvinyl Alcohol Fiber , Train Hardening ,

"Strong strain hardening in graphene/nanotwinned metal composites revea" by Che Zhang, Cheng Lu et al.

Abstract
In the present work, four types of graphene/nanotwinned (nt) metal composites are constructed by incorporation of graphene into nt-Au, nt-Ag, nt-Al and nt-Ni matrices, respectively. Their mechanical properties and deformation behaviors are investigated by using molecular dynamics (MD) simulations. Strong strain hardening is found in both Gr/nt-Au and Gr/nt-Ag due to fast structural transition. The transition begins with the propagation of partial dislocations, followed by lattice rotation with the formation of stacking faults, finally resulting in the formation of ultrahigh-density twins with high similarity to the experimental findings. The strain-hardening behavior can only be obtained under uniaxial compression along [1 -1 -2] direction, showing a high orientation dependence. Graphene wrinkles and symmetrical lattice structure in nt-metal matrices are two key factors for a smooth structural transition with strong strain-hardening in Gr/nt-Au and Gr/nt-Ag. However, ....

Graphene Metal Composites , Mechanical Properties , Rientation Dependence , Train Hardening , Ltrahigh Density Twins ,

"Material ductility and temperature effects on block shear capacity of " by Yong Hyun Cho, Lip H. Teh et al.

Abstract
The block shear equation in the current Australasian and amended North American cold-formed steel design specifications is based on shear yielding without strain hardening, while that in the new Aluminum Design Manual assumes full shear strain hardening. This study investigates the range of applicability for both assumptions through experimental tests involving ultra-high strength steel bolted connections at room (ambient) and elevated temperatures, where the levels of material ductility are vastly different from each other. The experimental program has found that the block shear capacities of the ultra-high strength steel bolted connections at room temperature can be determined accurately by neglecting shear strain hardening, but full hardening can be assumed for high strength and mild steel connections. Surprisingly, at temperatures above 300 °C, even the assumption of full shear strain hardening for single-row bolted connections is too conservative, by up to 50%. ....

United States , North American , Aluminum Design Manual , Block Shear , Bolted Connection , Atenary Effect , Uctility Effects , Teel Connection , Train Hardening , Ultra High Strength Steel , ஒன்றுபட்டது மாநிலங்களில் , வடக்கு அமெரிக்கன் ,