SURFACE REACTIVITY OF TITANIUM ALUMINUM-ALLOYS - TI3AL, TIAL, AND TIAL3

被引:60
作者
MENCER, DE
HESS, TR
MEBRAHTU, T
COCKE, DL
NAUGLE, DG
机构
[1] LAMAR UNIV,DEPT CHEM,BEAUMONT,TX 77710
[2] TEXAS A&M UNIV SYST,DEPT PHYS,COLLEGE STN,TX 77843
来源
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS | 1991年 / 9卷 / 03期
关键词
D O I
10.1116/1.577669
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Titanium-based alloys, and Ti-Al alloys in particular, are of special interest due to the technological importance of these materials as structural materials in aggressive environments. The surface chemistry of 1000-angstrom films of Ti3Al, TiAl, and TiAl3, prepared by codeposition in an ultrahigh vacuum system, has been examined by x-ray photoelectron spectroscopy (XPS). The alloys are examined as deposited and after treatments from room temperature to 600-degrees-C in either vacuum of 5 x 10(-7) Torr or 5 x 10(-3) Torr O2. The alloys are compared with one another with regard to their surface segregation and oxide overlayer formation. Particular attention is given to the nature of the surface oxide that develops under the various conditions, and low take-off angle XPS is used to determine the depth distribution of the various oxides present. The oxidation process is controlled by temperature, oxygen pressure, the bulk alloy composition and the free energies of formation for the various oxides found in the overlayers.
引用
收藏
页码:1610 / 1615
页数:6
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