Achieving High Strength-plasticity of Nanoscale Lamellar Grain Extracted from Gradient Lamellar Nickel

Abstract Traditional metallic materials usually face a dilemma between high strength and poor strain hardening capacity. However, heterogeneous structured have been found to obviously overcome the trade-off. Herein, gradient lamellar structure was fabricated through ultrasound-aided deep rolling technique in pure Ni with stacking fault energy after heat treatment. The successively divided into four regions. In-situ micropillar compression tests were conducted different regions reveal corresponding microscopic mechanical properties. Microscopic characterization techniques performed explore underlying deformation mechanisms effects of microstructural parameters on behaviors. This work demonstrates that near nanoscale thickness possesses excellent plasticity. On one hand, reason for is increases decrease according Hall-Petch effect. other numerous grain boundaries perpendicular loading direction hinder motion slip bands, resulting great capacity micropillar.