您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 1    February 2004

[PDF Download]    [Flash Online]

    

Effects ofγ/γinterfacial structures on continuous coarsening
of lamellar microstructure in TiAl alloy during aging
LI Zhen-xi(李臻熙), CAO Chun-xiao(曹春晓)

Beijing Institute of Aeronautical Materials, Beijing 100095, China

Abstract:The effects ofγ/γinterfacial structures on continuous coarsening of the fully lamellar microstructure in Ti48Al alloy aged at 1 150℃were investigated by using transmission electron microscopy(TEM). Continuous lamellar coarsening can be achieved not only by migration of interface faults(such as ledges, edges and curved interfaces) but also by migration and decomposition of perfectγ/γlamellar interfaces. Thermal grooves, initiative positions of interfacial dissociation, can frequently form at the triple point junctions between the 120°-rotational orderedγdomain boundaries within γlamellae and the lamellar interfaces. During the early stage of aging at 1 150℃, the interface migration and dissociation took place preferentially at the 120°-rotational ordered lamellar interfaces. Comparing the relative thermal stability of the true-twin, pseudo-twin and 120°-rotational orderedγ/γlamellar interfaces shows that the 120°-rotational ordered lamellar interface is the most unstable. The reason of this phenomenon was analyzed through the comparisons of the interfacial energies and atomic arrangements of the three types ofγ/γlamellar interfaces.

 

Key words: titanium aluminide; lamellar microstructure; continuous coarsening;γ/γlamellar interface; orientation relationship; aging

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn