X-ray Diffraction Study of the NiTi Subsurface Microstructure Modified with Low-energy High-current Electron Beams

摘要：

　　In the work, we study structural -phase conditions and residual stresses in nickel titanium (NiTi) alloy surface layers after electron beam treatment.The analysis were taken using X ray diffraction (XRD) techniques with symmetric and asymmetric Bragg diffraction geometries.It is found that the B19 martensite phase arises under applied external stresses at a temperature (Troom ≈300K) higher than the martensite start temperature Ms =283K and is a stress-induced martensite.The analysis of X-ray data revealed, that as a result the electron-beam working of the TiNi samples was formed the surface modified layer, which can be considered as the concentrator of the internal stres ses, which are gradient changed inside this layer and exiting to the deeper layers of the material.The maximum residual stresses σ ≈ 550 MPa are found in the modified surface layer, whereas the residual stresses in the underlying layer with initial B2 struc ture are no greater than ~ 100 MPa.

关键词： X-ray diffraction analysis Nickel-titanium alloy Surface layers Electron beam treatment Residual elastic stresses

作者: L.L.Meisner M.G.Ostapenko A.A.Lotkov E.Yu.Gudimova

作者单位: Institute of Strength Physics and Materials Science SB RAS,2/4 Akademichesky Ave.,Tomsk,634021,Russi Institute of Strength Physics and Materials Science SB RAS,2/4 Akademichesky Ave.,Tomsk,634021,Russi

会议类型: 国际会议

会议名称: The 12th China-Russia Symposium on Advanced Materials and Technologies(第十二届中俄双边新材料新工艺国际会议)

会议地点: 昆明

会议语种:英文

页码: 349-352

在线出版日期: 2013-11-19（万方平台首次上网日期，不代表论文的发表时间）