D.R. Ni

TL;DR: In this article, a series of ideal materials with average grain sizes range from 0.7μm to 30.0μm containing high fraction of high angle grain boundaries (HAGBs), equiaxed grains and low density of dislocations were produced by friction stir processing (FSP).

TL;DR: In this article, the authors identify deformation behavior and strengthening mechanisms of a carbon nanotube (CNT)-reinforced bimodal-grained Al-Cu-Mg nanocomposite and its base alloy fabricated by two-step ball milling, powder metallurgy and extrusion.

TL;DR: In this article, equal strength quenching and partitioning (Q&P) 1180 steel joints to parent metal were successfully fabricated via friction stir welding (FSW) technique under different parameters, such as the formation of fresh martensite was the main mechanism for the SZ hardening, while the decomposition of metastable phases played key roles in the microhardness drop of the HAZ.

TL;DR: In this paper, the tension-tension/tension-compression fatigue behaviors of bimodal structure CNT/7055Al composites consisting of ultra-fine grain (UFG) zones rich of CNTs and coarse grain (CG) bands free of carbon nanotube (CNTs) were investigated and the corresponding damage mechanisms were analyzed.

TL;DR: In this article, 6'mm thick 2219-T8 aluminum alloy plates were subjected to Bobbin tool friction stir welding (BT-FSW) under a constant rotation rate of 300 rpm and welding speeds of 150-500mm min−1 with the objective of analyzing the evolution of microvoid defects and their effect.