Ti-2Al-2.5Zr合金He离子辐照效应研究  

Effect of He on properties and microstructure of Ti-2Al-2.5Zr alloy

作　　者：何晓[1] 封向东[2] 周继萌[2] 刘彦章[1] 祖小涛[1] 

机构地区：[1]电子科技大学应用物理系,成都610054 [2]四川大学辐射物理及技术教育部重点实验室,成都610064

出　　处：《强激光与粒子束》2006年第7期1208-1210,共3页High Power Laser and Particle Beams

基　　金：国家自然科学基金委-中国工程物理研究院联合基金资助课题(10376006);中国核动力研究设计院核燃料及材料国家级重点实验室资助课题

摘　　要：在Ti-2Al-2.5Zr合金中注入能量为75 keV的He离子,注入剂量分别为5×1016cm-2,1×1017cm-2。通过显微硬度测量和剖面电子显微观察,研究了He离子对Ti-2Al-2.5Zr合金力学性能和显微组织的影响。结果表明:样品的显微硬度随He离子注量的增加而升高,在温度为350和550℃的Ar气中退火后硬度有所下降。剖面电子显微观察发现有位错环和He气泡生成,退火后He气泡有长大、缺陷有回复的趋势。辐照产生的位错环是辐照后硬度升高的直接原因,其退火发生回复又引起硬度随退火温度的升高而降低。Ion-implantation-enhanced hardening and microstructure change of a Ti-Al-2.5Zr alloy by 75 keV helium ion im- plantation with the dose of 5×10^16cm^-2 or1×10^17cm^-2 is investigated. The maximum temperature during the implantation was monitored to be less than 200 ℃. The base pressure in the vacuum chamber was 6 × 10^-4 Pa, and the working pressure was 1.6 × 10^-3 Pa. The morphology and the structure of the implant samples have been characterized by TEM using a JEOL 2010FEG at 200 keV. The surface characterization of samples was studied by Vickers hardness tests. The He-induced hardening was observed. The He-induced hardening decreases with annealing at 350 ℃ and 550 ℃. The results of TEM analysis show that helium bubbles and dislocation loops are formed in the near surface region. He-ion-implantation-enhanced hardening is due to formation of dislocation loops mainly.

关 键 词：TI-2AL-2.5ZR合金 离子注入 透射电镜 显微硬度 

分 类 号：TG139.6[一般工业技术—材料科学与工程]