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"A study on the microstructural evolution of copper/aluminum composite " by Chen Wang, Xiaoguang Ma et al.

Copper/aluminum (Cu/Al) composites with multifunctional applications have been extensively applied in a variety of fields. Nevertheless, the formability of Cu/Al composite strips during micro flexible rolling (MFR) has not been fully investigated in the sub-millimetre range. In the present work, the microstructure, mechanical properties and formability of Cu/Al composite strips during MFR were studied. The microstructure of the annealed and rolled specimens were characterized using scanning electron microscope (SEM) and electron backscatter diffraction (EBSD), and the thickness of Cu/Al composite strips with varying thickness (CSVT) was measured by laser scanning microscope. The results show that Cu/Al composite strips annealed at 400 °C exhibit the best ductility, and the CSVT with the best forming quality is obtained when the Cu layer is contact with the upper work roll. In addition, the microstructural evolution in the downward transition zone, thinner zone, upward transition zone ....

Composite Strip , Copper Aluminum , Intermetallic Compounds , Icro Flexible Rolling ,

"Effect of Interlayer-Compressed Argon Gas Active Cooling on Microstruc" by Jianfei Zhang, Siyu Zhou et al.

Wire arc additive manufacturing (WAAM) has been widely used due to its advantages of low cost and high efficiency. However, one of the unsolved problems in WAAM is the heat accumulation. In this study, the compressed argon-based interlayer active cooling (AC) process is employed to reduce heat accumulation, and the influence mechanism on microstructure and mechanical properties of Ti–6Al–4V samples are revealed. It is shown in the results that the introduction of interlayer AC leads to the interlayer temperature decreases from 468 to 53 °C, and the widths of prior-β grains and αGB are refined. The increase of cooling rate (380–604 °C s−1) results in the transformation of large-sized colonies into finer basket weave structure, accompanied by the production of martensite α’. The finer basket weave structure increases the strength of the samples, while the narrower αGB and the high-angle grain boundaries increase the resistance of crack propagation. The high dislocation de ....

Active Cooling , Tensile Properties , I 6al 4v , Wire Arc Additive Manufacturing ,

"Microstructure and Properties of Nonlinear Lap Joint of 6061 Aluminum " by Laipeng Qu, Ning Ma et al.

The microstructure and properties of non-linear friction stir welded lap joints of the AA6061-T6 aluminum alloy were investigated, with a particular focus on the influence of corner curvature on the formability and mechanical properties of the joints. The research results indicate that for the 6061-T6 aluminum alloy lap joint friction stir welding with a smaller radius (R < 7 mm), there is a more severe accumulation of welding material. When the radius exceeds 7 mm, good macroscopic joint formation can be achieved. Various regions at the joint corners are composed of α-Al and intermetallic precipitations β phases. The microstructure of the heat-affected zone (HAZ) appeared relatively coarse, the weld nugget zone (WNZ) had the finest grain, and partial dissolution of the β phase occurred. The grain size in the middle WNZ at the corner was larger than at the ends, and the grain size on the inner side of the corner was larger than on the outer side. The hardness distribution of the ....

Aluminum Alloy , Friction Stir Welding , Mechanical Properties , Onlinear Lap Joint ,

"Optimising Two-Stage Vacuum Heat Treatment for a High-Strength Micro-A" by Yao Lu, Jun Wang et al.

The heat treatment process is a vital step for manufacturing high-speed railway spring fasteners. In this study, orthogonal experiments were carried out to obtain reliable optimised heat treatment parameters through a streamlined number of experiments. Results revealed that a better comprehensive mechanical performance could be obtained under the following combination of heat treatment parameters: quenching temperature of 850 °C, holding time of 35 min, medium of 12% polyalkylene glycol (PAG) aqueous solution, tempering temperature of 460 °C, and holding time of 60 min. As one of the most important testing criteria, fatigue performance would be improved with increasing strength. Additionally, a high ratio of martensite to ferrite is proven to improve the fatigue limit more significantly. After this heat treatment process, the metallographic microstructure and mechanical properties satisfy the technical requirements for the high-speed railway practical operation. These findings provid ....

Fatigue Performance , Eat Treatment Optimisation , Mechanical Property , I Cr Spring Steel ,

TMS Specialty Congress 2024

The 2024 TMS Specialty Congress is a synergistic event with a single registration fee. This enables attendees to explore their particular technical interest in-depth, while also having access to cross-disciplinary learning and collaboration opportun ....

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