中子衍射应力分析技术及其应用进展

林皓, 李建, 杨钊龙, 钟圣怡

Recent Progress in Stress Analysis Technology and Application of Neutron Diffraction

LIN Hao, LI Jian, YANG Zhaolong, ZHONG Shengyi

图5 通过SEM、中子衍射(ND)和原位高温ND实验中的真应变-应力曲线获得的均匀化NbTaTiV合金的微观结构、相特征和力学性能[49]

Fig.5 Microstructures, phase characteristics, and mechanical properties of the homogenized NbTaTiV alloy, studied by SEM, neutron diffraction (ND), and true strain-stress curves during in situ ND experiments at elevated temperatures[49] (a) SEM-BSE image of the homogenization-treated NbTaTiV refractory high-entropy alloy (Inset shows the corresponding high magnified image) (b) ND patterns with the peaks indexed for a bcc structure at room temperature (RT), 500oC, 700oC, and 900oC (d-spacing—interplanar spacing) (c) true stress-strain curves recorded during the in situ compression experiment at RT, 500oC, 700oC, and 900oC with a strain rate of 1 × 10-4 s-1 (Table in Fig.5c show the yield strength (σy) and work-hardening exponent (N) of the present alloy gradually decreased from 1064 MPa (RT) to 595 MPa (900oC) and from 0.2732 (RT) to 0.1199 (900oC), respectively)