Journal of Materials Research and Technology

This study aims to elucidate the fundamental superplastic deformation mechanisms and microstructural evolution of a fine-grained Inconel 718 sheet, which is crucial for optimizing its superplastic forming process window. Within the range of 910-970 °C and strain rates of 6×10 -4 to 4×10 -3 s -1 , the alloy exhibits superior superplastic elongation of up to 750%, strain rate sensitivity ( m ) valu…

High-level residual stresses generated during plastic forming of brass alloys severely compromise the dimensional accuracy, stress corrosion resistance, and service reliability of components. Conventional heat treatment methods suffer from high energy consumption, long processing time, and risks of grain coarsening, making it difficult to achieve efficient stress relief under mild conditions. Thi…

The high temperature deformation of the 80% cold rolled Fe-35Mn-8Al-0.3C low-density steel were carried out under different deformation temperatures ranging from 700 to 900 °C and varied strain rates from 1× 10 -4 s -1 to 1×10 -1 s -1 . It was found that an excellent fracture elongation of 633% could be reached at initial deformation strain rate at 1×10 -2 s -1 under 800 °C. The microstructure wa…

Yttrium (Y) is an effective alloying element for tuning the overall performance of magnesium (Mg) alloys. However, the optimal content of Y in low-alloyed magnesium alloys and the synergistic mechanism between degradation rate and mechanical properties is still unclear. The current study investigates the effects of Y addition on the microstructure, mechanical properties and degradation rate of as…

The effect of different pre-treatment processes on the precipitation and hardening response of Al-Mg-Si-Cu was systematically studied by a combination of various characterization techniques. It was revealed that both of the pre-aging and pre-straining is unable to increase the peak aging hardness, but can accelerate the precipitation kinetics of the alloy as compared with single-stage aging. A no…

This work systematically investigates the microstructure evolution, texture transformation, deformation mechanism, and tensile response of Ti-2Al-2.5Zr tubes during multi-pass cold rolling using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and in-situ tensile testing. The novelty of this study lies in correlating rolling-pass…

To improve the interfacial bonding strength of 6061/Q345 aluminum/steel composite plates, an intermediate alloy layer was hot-dip coated on Q345 steel before solid-liquid cast-rolling. In this work, first-principles calculations together with experimental characterization were employed to investigate the influence of hot-dip Al-1Si-0.3M (La/Sc/Yb) coating on the interfacial microstructures and me…

Crack closure commonly occurs during fatigue crack propagation of IN718 superalloy. The fatigue crack growth rate of IN718 superalloy was evaluated under several positive stress ratios at room temperature and the plastic deformation characteristics of the wake zone were analyzed. Nanocrystalline thin layers were observed in the wake region of all specimens, indicating that the plasticity-induced …

Phase equilibria in the Sm-Fe-Ti system at 873 and 1073 K as well as solidification microstructure of several Sm-Fe-Ti as-cast alloys were investigated by using the equilibrated alloy method with scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and X-ray diffraction (XRD). The experimental results reveal that the ternary intermetallic compounds τ 3 -Sm(Fe, Ti) 11 was observ…

The microstructure and corrosion behavior of 316L stainless steel (316L SS) fabricated by laser powder bed fusion (LPBF) and subsequently annealed at 800 o C, 1000 o C, and 1200 o C for 4 h were investigated. Surface characterization and electrochemical measurements were employed. The results showed that the annealing treatment did not alter the phase composition of LPBF 316L SS. However, the gra…

Alongside the technological, social, and economic development of the construction industry, a growing demand for materials to serve this sector is a cause for concern and increases the need for alternatives. The environmental impacts resulting from the production of cement and other binders, as well as the enormous volumes of natural aggregates extracted from their deposits, for example, have mot…

Fire-resistant steels are designed to retain sufficient strength at elevated temperatures and prevent sudden structural collapse during fire exposure. Although Mo is widely recognized as the most effective alloying element for enhancing high-temperature strength retention, the development of low-Mo steels with comparable fire-resistant performance is increasingly demanded due to the high cost and…

NiTi shape memory alloys (SMAs) are widely used in biomedical and aerospace fields. Wire arc additive manufacturing (WAAM) provides an efficient route for fabricating NiTi components, but the process is prone to defects such as coarse grains, residual stress accumulation, and insufficient fatigue performance. In this study, the as-built WAAM-fabricated NiTi SMA was solution-treated at 950 °C for …