电弧熔炼TA10钛合金中hcp/bcc结构结晶取向计算  

Calculation of Crystallographic Orientation of hcp/bcc Structures in TA10 Titanium Alloy Prepared by Arc Smelting

作　　者：黄海广[1] 周荣锋[1,2] 马国栋 李璐[1,2] 刘春侠[2] 李永坤[1] Huang Haiguang;Zhou Rongfeng;Ma Guodong;Li Lu;Liu Chunxia;Li Yongkun(Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Research Center for Analysis and Measurement,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]昆明理工大学分析测试研究中心,云南昆明650093

出　　处：《稀有金属》2022年第4期451-460,共10页Chinese Journal of Rare Metals

基　　金：云南省科技计划项目(202002AB080001);云南省重点研发计划项目-国际科技合作专项项目(202103AF140004);云南省万人计划青年拔尖人才项目(YNWR-QNBJ-2019-106)资助。

摘　　要：通过电弧熔炼的方法制备了TA10钛合金铸锭,对铸锭通过光学显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)和透射电镜(TEM)进行了一系列表征,观察了该合金铸锭的微观结构,明确了α/β两相之间的晶体学位向关系。基于合金的α/β两相的晶体常数,应用“边-边匹配”模型,确定了α/β两相的(近)密排方向及(近)密排面,计算了晶向原子间距错配度以确定可能匹配的晶向,进而计算了晶面间距错配度以确定可能匹配的晶面。最终,计算得到四种在合金α/β两相中可能存在的位向关系,对这4种可能存在的位向关系以2D不变线理论进行了进一步明确。对于明确后的位向关系,基于“边-边匹配”模型的基本原则,进行了α/β两相界面处原子模拟。铸锭中存在的位向关系属于预测计算的位向关系的一种,并且α/β两相电子衍射花样与模拟衍射斑点花样吻合较好,因而验证了“边-边匹配”模型在TA10钛合金中的适用性。Titanium and its alloys are currently commonly used structural materials with low density in the industry.It is widely used in aerospace,chemical industry,bioengineering and other fields.TA10 titanium alloy is a kind of nearlyαtype titanium alloy,which has strong resistance to crevice corrosion in high temperature and high content chloride.Therefore,TA10 titanium alloy is widely used as the sealing surface material of container equipment to solve the problem of crevice corrosion on the sealing surface of equipment.And it is also an excellent material for heat exchangers and pipes.At present,most of the research on TA10 titanium alloy focused on corrosion performance and processing technology.The domestic prediction and calculation of orientation relationship of titanium alloys are relatively weak.Therefore,the possible orientation relationships in TA10 titanium alloy were calculated and the edge-to-edge matching model was verified on TA10 titanium alloy for its applicability.In recent decades,researchers proposed several crystallographic models to describe the orientation relationship between the two phases in the phase transition process,such as structural ledge model,near-coincidence site model,invariant line model,O-lattice model,edge-to-edge matching model and so on.Among them,the edge-to-edge matching model was a recently developed model.The basis of the theoretical calculations in this paper was the edgeto-edge matching model.Compared with other crystallographic models,the edge-to-edge matching model could predict the orientation relationship of the two phases in a phase transition,not just explain the orientation relationship of two phases.And the edge-to-edge matching model only needed the basic crystallographic information of the two phases as a basis.To acquire the basic crystallographic information of TA10 titanium alloy,TA10(Ti-0.3Mo-0.8Ni)alloy ingots were prepared by arc smelting method using titanium powder,molybdenum powder and nickel powder as raw materials.TA10 alloy ingot was smelted three tim

关 键 词：TA10钛合金 晶体结构 物相界面 位向关系 边-边匹配 

分 类 号：TG146.23[一般工业技术—材料科学与工程]