本文论述了用 X 射线衍射法间接测定双■轮刨片机 GCr15钢制刀片的工作温度.用该钢种制成并经不同热处理的八个标样和服役后的刀片,进行衍射线形的测量和半高宽值的测算.通过微机进行的回归分析,得出半高宽值与温度的关系曲线的相关系数...本文论述了用 X 射线衍射法间接测定双■轮刨片机 GCr15钢制刀片的工作温度.用该钢种制成并经不同热处理的八个标样和服役后的刀片,进行衍射线形的测量和半高宽值的测算.通过微机进行的回归分析,得出半高宽值与温度的关系曲线的相关系数为0.995,刀片工作温度为271±10℃.理论分析和实验数据表明:这一间接测定刀片工作温度的方法、简便易行,有一定的准确、可靠性.对某些不能用常规方法测定工作温度的金属零件具有特殊的意义.展开更多
Line profile analysis of X-ray and neutron diffraction patterns is a powerful tool for determining the microstructure of crystalline materials. The Convolutional-Multiple-Whole-Profile (CMWP) procedure is based on phy...Line profile analysis of X-ray and neutron diffraction patterns is a powerful tool for determining the microstructure of crystalline materials. The Convolutional-Multiple-Whole-Profile (CMWP) procedure is based on physical profile functions for dislocations, domain size, stacking faults and twin boundaries. Order dependence, strain anisotropy, hkl dependent broadening of planar defects and peak shape are used to separate the effect of different lattice defect types. The Marquardt-Levenberg (ML) numerical optimiza-tion procedure has been used successfully to determine crystal defect types and densities. However, in more complex cases like hexagonal materials or multiple phases the ML procedure alone reveals uncer-tainties. In a new approach the ML and a Monte-Carlo statistical method are combined in an alternative manner. The new CMWP procedure eliminates uncertainties and provides globally optimized parameters.展开更多
The crystal structure of new compound Ba 3BPO 7 has been solved by X ray powder diffraction technique. As a new structure type, the positions of barium, boron and phosphate atoms have been determined by single crystal...The crystal structure of new compound Ba 3BPO 7 has been solved by X ray powder diffraction technique. As a new structure type, the positions of barium, boron and phosphate atoms have been determined by single crystal direct method after profile decomposition from Ba 3BPO 7 X ray powder diffraction patterns. The positions of oxygen atoms have been determined by the interpretation of their vibration spectra which indicate that in this crystal the boron and phosphorus atoms form BO 3 and PO 4 polyhedra. The structure has been refined by Rietveld technique based on the above model.展开更多
文摘本文论述了用 X 射线衍射法间接测定双■轮刨片机 GCr15钢制刀片的工作温度.用该钢种制成并经不同热处理的八个标样和服役后的刀片,进行衍射线形的测量和半高宽值的测算.通过微机进行的回归分析,得出半高宽值与温度的关系曲线的相关系数为0.995,刀片工作温度为271±10℃.理论分析和实验数据表明:这一间接测定刀片工作温度的方法、简便易行,有一定的准确、可靠性.对某些不能用常规方法测定工作温度的金属零件具有特殊的意义.
基金support of the János Bolyai Research Fellowship of the Hungarian Academy of Sciences. T.U. is grateful for partial funding of this work by an EPSRC Leadership Fellowship [EP/I005420/1, EP/K039237/1, EP/K034650/1, EP/L018616/1 and EP/K034332/1] for the study of irradiation damage in zirconium alloys
文摘Line profile analysis of X-ray and neutron diffraction patterns is a powerful tool for determining the microstructure of crystalline materials. The Convolutional-Multiple-Whole-Profile (CMWP) procedure is based on physical profile functions for dislocations, domain size, stacking faults and twin boundaries. Order dependence, strain anisotropy, hkl dependent broadening of planar defects and peak shape are used to separate the effect of different lattice defect types. The Marquardt-Levenberg (ML) numerical optimiza-tion procedure has been used successfully to determine crystal defect types and densities. However, in more complex cases like hexagonal materials or multiple phases the ML procedure alone reveals uncer-tainties. In a new approach the ML and a Monte-Carlo statistical method are combined in an alternative manner. The new CMWP procedure eliminates uncertainties and provides globally optimized parameters.
文摘The crystal structure of new compound Ba 3BPO 7 has been solved by X ray powder diffraction technique. As a new structure type, the positions of barium, boron and phosphate atoms have been determined by single crystal direct method after profile decomposition from Ba 3BPO 7 X ray powder diffraction patterns. The positions of oxygen atoms have been determined by the interpretation of their vibration spectra which indicate that in this crystal the boron and phosphorus atoms form BO 3 and PO 4 polyhedra. The structure has been refined by Rietveld technique based on the above model.
