大尺寸70%DKDP晶体残余应力应变研究  

Residual Stress and Strain in 70%DKDP Single Crystal with Large Size

作　　者：刘发付 牟晓明[1,2] 郭建斌 郭在在[1,2] 曹剑武 徐明霞[3] LIU Fafu;MU Xiaoming;GUO Jianbin;GUO Zaizai;CAO Jianwu;XU Mingxia(Ningbo Branch of China Ordnance Research Institute,Ningbo 315103,China;Inner Mongolia Metal Material Research Institute,Baotou 014000,China;State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China)

机构地区：[1]中国兵器科学研究院宁波分院,宁波315103 [2]内蒙金属材料研究所,包头014000 [3]山东大学晶体材料国家重点实验室,济南250100

出　　处：《人工晶体学报》2023年第7期1357-1363,共7页Journal of Synthetic Crystals

基　　金：国家重点研发计划(2022YFB3705900);山东省泰山学者团队项目。

摘　　要：本研究使用传统液相法生长了氘含量为70%的大尺寸磷酸二氘钾(DKDP)晶体,采用中子衍射技术测量了三倍频DKDP晶片内部的残余应力和微观应变,利用X射线同步辐射探测了晶体锥面和柱面的微观形貌。研究了DKDP晶体沿[100]晶向宏观残余应力和微观残余应变的分布。结果表明:传统液相法生长的DKDP晶体柱面区域的残余应力为压应力,而锥面区域的残余应力为拉应力;锥面的拉应力容易导致晶体在生长和搬运过程中开裂,与实验现象相符;传统液相法生长的DKDP晶体的残余微观应变较小,但晶体中仍存在缺陷,这些缺陷是晶体残余应力和应变存在的原因之一。该研究可指导大尺寸70%DKDP晶体工程化应用。In this study,a large size potassium deuterium phosphate(DKDP)single crystal with deuterium content of 70%was grown by traditional liquid phase method.The residual stress and micro-strain in the frequency tripling DKDP crystal were measured by neutron diffraction technique,and the micro-morphology of crystal in pyramidal and cylindrical faces were detected by X-ray synchrotron radiation.The distribution of macro-residual stress and micro-strain in the DKDP crystal sample along the[100]crystal direction were studied.The results show that the residual stress in the cylindrical region of DKDP crystal grown by traditional liquid phase method is compressive stress,while the residual stress in the pyramidal region is tensile stress.The tensile stress in the pyramidal region is easy to cause crystal cracking during growth and transportation,which is consistent with the experimental phenomenon.The residual micro-strain in the DKDP crystal grown by the traditional liquid phase method is small,however,there are still some defects in the DKDP crystal,which is one of the reasons for the existence of residual stress and strain in the crystal.The study can direct the engineering application of large size 70%DKDP crystal.

关 键 词：DKDP晶体 传统液相法 中子衍射 残余应力 微观应变 

分 类 号：O78[理学—晶体学] O733