THE DIFFUSE OMEGA STRUCTURE - ITS RELATIONSHIP TO SPONTANEOUS VITRIFICATION IN BETA-TI-CR

被引：15

作者：

SINKLER, W ^{[1
]}

LUZZI, DE ^{[1
]}

机构：

[1] UNIV PENN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1993年 / 194卷 / 02期

关键词：

D O I：

10.1016/0925-8388(93)90011-B

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Diffuse scattering from quenched beta-Ti-Cr alloys is investigated using electron diffraction. A new structural model based on displacive atomic shifts coupled to chemical short-range order is described and shown to account for the observed diffuse scattering. Changes of the diffuse scattering in Ti0.6Cr0.4 due to 1 MeV electron irradiation support the presence of chemical short-range order in quenched Ti-Cr. The significance of these results in light of recent reports that the quenched-in beta phase in a concentrated Ti-Cr alloy undergoes a transformation to the amorphous state during low temperature annealing, a process known as spontaneous vitrification, is discussed.

引用

页码：273 / 278

页数：6

共 25 条

[1]

ALLEN C, 1992, COMMUNICATION

[2] CASCADE-DRIVEN MIGRATION OF STRUCTURAL INTERFACES - A NEW TYPE OF IRRADIATION-INDUCED PHASE-TRANSFORMATION [J].

ALLEN, CW ;

REHN, LE ;

WIEDERSICH, H .

APPLIED PHYSICS LETTERS, 1987, 50 (26) :1876-1878

[3]

ALLEN CW, 1988, ULTRAMICROSCOPY, V30, P188

[4]

BAGARYATSKII YA, 1962, PHYS MET METALLOGR, V13, P92

[5]

BANERJEE S, 1984, ACTA METALL MATER, V32, P299, DOI 10.1016/0001-6160(84)90103-2

[6]

BLACKBURN MJ, 1967, T METALL SOC AIME, V239, P287

[7] STRUCTURE AND TRANSFORMATION KINETICS IN SPONTANEOUSLY VITRIFIED CR-TI ALLOYS [J].

BLATTER, A ;

GFELLER, J ;

VONALLMEN, M .

JOURNAL OF THE LESS-COMMON METALS, 1988, 140 :317-325

[8] SPONTANEOUS VITRIFICATION IN CR-TI BULK ALLOYS [J].

BLATTER, A ;

VONALLMEN, M ;

BALTZER, N .

JOURNAL OF APPLIED PHYSICS, 1987, 62 (01) :276-280

[9] THE LA-2/3(1,1,1) ANOMALY IN BCC STRUCTURE [J].

FALTER, C ;

LUDWIG, W ;

SELMKE, M ;

ZIERAU, W .

PHYSICS LETTERS A, 1982, 90 (05) :250-252

[10] THE THERMODYNAMICS OF INVERSE MELTING [J].

GREER, AL .

JOURNAL OF THE LESS-COMMON METALS, 1988, 140 :327-334

← 1 2 3 →