短波长X射线应力测试的重复性及统计误差评估  

Repetition and Statistical Errors Calculation for Short Wavelength X-Ray Stress Measurement

作　　者：董平[1] 张鹏程[1] 窦作勇[1] 王茂银[1] 陈力[2] 李云[2] 

机构地区：[1]表面物理与化学重点实验室,绵阳621907 [2]中国工程物理研究院,绵阳621900

出　　处：《机械工程材料》2015年第11期23-26,共4页Materials For Mechanical Engineering

基　　金：国家重大科学仪器开发资助项目(2012YQ130234)

摘　　要：采用XL-1型短波长应力分析仪对铝板同一位置的Al(111)晶面衍射峰进行了8次测试,再分别采用交相关法和抛物线法定峰,确定了测试衍射峰的位置、积分强度及半高宽等参数,计算了它们8次测试重复性的相对偏差,并基于通常的sin2ψ应力测试技术,评估了两种定峰方法对铝板应力测试的统计误差。结果表明:采用交相关法和抛物线法定峰时,Al(111)晶面衍射峰位测试重复性的相对偏差分别只有0.144‰和1.27‰,衍射峰积分强度和半高宽测试重复性的相对偏差分别为5.38%和5.56%;采用交相关法和抛物线法定峰进行应力测试的统计误差分别为7.56 MPa和6.64 MPa,该误差值处在常规X射线应力测试允许的误差范围内。The diffraction peak of Al（111）plane in an aluminum sample was measured repeatedly for 8 times at a fixed point by using an XL-1 type short wavelength stress analyzer,and then peak locations,integral intensity and full width of half maximum intensity（FWHM）were determined by using cross correlation method and parabola method,and relative deviations of repeated measurement for 8 times were calculated.The stress statistical errors for aluminum plate were also evaluated according to sin2ψstress measuring technique.The results show the relative deviations of measuring repeatability for Al（1 1 1 ）plane peak locations determined by cross correlation method and parabola method were 0.144‰ and 1.27‰,and that of measuring repeatability for integral intensity and FWHM were 5.38% and 5.56%,respectively.The stress statistical errors were 7.56 MPa and 6.64 MPa from cross correlation method and parabola method,and the errors in the error range permitted by a conventional X-ray stress measurement.

关 键 词：X射线应力分析 内部应力 短波长 

分 类 号：TB302.5[一般工业技术—材料科学与工程] TH878[机械工程—仪器科学与技术]