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金属学报  2020, Vol. 56 Issue (4): 487-493    DOI: 10.11900/0412.1961.2020.00016
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基于中子衍射和同步辐射X射线衍射的TWIP钢位错密度计算方法
李亦庄1,2,黄明欣1,2()
1.香港大学机械工程系 香港 999077
2.香港大学深圳研究院 深圳 518057
A Method to Calculate the Dislocation Density of a TWIP Steel Based on Neutron Diffraction and Synchrotron X-Ray Diffraction
LI Yizhuang1,2,HUANG Mingxin1,2()
1.Department of Mechanical Engineering, The University of Hong Kong, Hong Kong 999077, China
2.Shenzhen Institute of Research and Innovation, The University of Hong Kong, Shenzhen 518057, China
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摘要: 

本文详细梳理并介绍了被广泛应用于高强钢及其它结构金属材料位错密度计算的修正Williamson-Hall法,并结合中子衍射和同步辐射X射线衍射实验结果,以一种孪生诱发塑性(TWIP)钢为例,计算其在变形后的位错密度演化。本文详细介绍如何正确使用该方法以及如何避免常见的一些错误,并介绍其背后的原理及假设。

关键词 修正Williamson-Hall法位错密度TWIP钢中子衍射同步辐射X射线衍射    
Abstract

The modified Williamson-Hall method, which has been widely used to calculate dislocation densities of high-strength steels and other structural alloys, is re-examined in this work, and is further applied to calculate the dislocation density of a deformed twinning-induced plasticity (TWIP) steel by using its neutron diffraction patterns and synchrotron X-ray diffraction patterns. This paper aims not only to promote the proper use of the method but also to shed light on its underlying pre-requisites and assumptions, and is thus expected to help avoid any errors during its usage.

Key wordsmodified Williamson-Hall method    dislocation density    TWIP steel    neutron diffraction    synchrotron X-ray diffraction
收稿日期: 2020-01-13     
ZTFLH:  TG115,TG142  
基金资助:国家重点研发计划项目(2019YFA0209900);国家自然科学基金项目(U1764252);香港研究资助局项目(17255016);香港研究资助局项目(17210418);香港研究资助局项目(R7066-18)
通讯作者: 黄明欣     E-mail: mxhuang@hku.hk
Corresponding author: Mingxin HUANG     E-mail: mxhuang@hku.hk
作者简介: 李亦庄,男,1992年生,博士

引用本文:

李亦庄,黄明欣. 基于中子衍射和同步辐射X射线衍射的TWIP钢位错密度计算方法[J]. 金属学报, 2020, 56(4): 487-493.
Yizhuang LI, Mingxin HUANG. A Method to Calculate the Dislocation Density of a TWIP Steel Based on Neutron Diffraction and Synchrotron X-Ray Diffraction. Acta Metall Sin, 2020, 56(4): 487-493.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00016      或      https://www.ams.org.cn/CN/Y2020/V56/I4/487

图1  孪晶诱发塑性(TWIP)钢变形前后的同步辐射XRD衍射信号(蓝色)与中子衍射信号(红色)
图2  未变形TWIP钢与标准样的衍射峰半高宽(ΔK)随峰位(K)的变化关系
图3  中子衍射与同步辐射XRD所测的变形TWIP钢ΔK (矫正后)随K的变化关系
图4  基于中子衍射与同步辐射XRD实验结果的修正Williamson-Hall法绘图
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