Plastic deformation combined with mechanical alloying in the engineering of metal surfaces

• 作 者: Niels Hansen Xiaoxu Huang Xiaodan Zhang
• 机 构: Section for Materials Science and Advanced Characterization, Department of Wind Energy, TechnicalUni
• 出 处: 第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
• 发表日期: 2016年4期
• 关键词: plastic deformation gradient nano-surface mechanical alloying

　　Plastic deformation is a well-known process to improve the wear and fatigue resistance of a metal surface. Many processes are in use and a common characteristic is that the metal surface and subsurface are work hardened simultaneously with the introduction of compressive residual (elastic) stresses and a refin ment of the microstructure. The surface hardness increases as the microstructure refines without saturation to the nan meter dimension if dynamic and thermal recovery processes can be hindered for example by introduction of elements in solid solution. As an example by addition of a small amount of an alloying element, the surface grain size can be reduced to 5 nm when copper is deformed by sliding (1). In the presentation three themes will be introduced and discussed:ⅰ) Estimation of the stress and strain distribution in a gradient nano-surface by hardness measurements and quantification of microstructural parameters by transmission electronmicroscopy and EBSD.ⅱ) Estimation of resistance for compressive stresses in a gradient nano-surface introduced by particle bombardment (shot peening), applying a 3D finite element model.ⅲ) Demonstration of surface engineering by a novel process combining plastic deformation and mechanical alloying to produce a multifunctional surface with good mechanical and thermal stability.