Formation of deformation twins in TiAl

被引：35

作者：

Cerreta, E

Mahajan, S

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Arizona State Univ, Dept Chem & Mat Engn, Tempe, AZ 85287 USA

来源：

ACTA MATERIALIA | 2001年 / 49卷 / 18期

关键词：

intermetallic; twinning;

D O I：

10.1016/S1359-6454(01)00264-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mechanisms have been proposed for the formation of fault-pairs in the L1(0) structure that involve both ordinary and super glide dislocations having co-planar Burgers vectors. These fault-pairs could serve as two-layer embryonic twins and twin thickening may occur by the coalescence of fault-pairs located at different levels within a slip band. The crystallographies of deformation twins are examined in as-processed TiAl by transmission electron microscopy and are correlated with that of slip required for the formation of fault-pairs. The correlations are consistent with the suggestion that fault-pairs maybe involved in the formation of deformation twins. Slip is observed ahead of a twin terminating within a crystal. Arguments are developed to rationalize this observation. (C) 2001 Published by Elsevier Science Ltd on behalf of Acta Materialia Inc.

引用

页码：3803 / 3809

页数：7

共 17 条

[1] DEFORMATION TWINNING [J].

CHRISTIAN, JW ;

MAHAJAN, S .

PROGRESS IN MATERIALS SCIENCE, 1995, 39 (1-2) :1-157

[2] AN INSITU STUDY OF TWIN PROPAGATION IN TIAL [J].

FARENC, S ;

COUJOU, A ;

COURET, A .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1993, 67 (01) :127-142

[3] AN ABSOLUTE DETERMINATION OF EXTRINSIC AND INTRINSIC STACKING FAULT ENERGIES IN AG-IN ALLOYS [J].

GALLAGHE.PC .

PHYSICA STATUS SOLIDI, 1966, 16 (01) :95-+

[4]

Girshick A., 1995, High-Temperature Ordered Intermetallic Alloys VI. Symposium, P145

[5]

HUG G, 1989, P INT S EL MICR PLAS, P451

[6] INTERACTION OF TWINS WITH EXISTING SUBSTRUCTURE AND TWINS IN COBALT-IRON ALLOYS [J].

MAHAJAN, S ;

CHIN, GY .

ACTA METALLURGICA, 1974, 22 (09) :1113-1119

[7] TWIN-SLIP AND TWIN-TWIN INTERACTIONS IN MO-35 AT PER CENT RE ALLOY [J].

MAHAJAN, S .

PHILOSOPHICAL MAGAZINE, 1971, 23 (184) :781-&

[8] EVOLUTION OF INTRINSIC-EXTRINSIC FAULTING IN FCC CRYSTALS [J].

MAHAJAN, S .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1975, 6 (10) :1877-1886

[9] TWIN-SLIP, TWIN-TWIN AND SLIP-TWIN INTERACTIONS IN CO-8 WT PERCENT FE ALLOY SINGLE-CRYSTALS [J].

MAHAJAN, S ;

CHIN, GY .

ACTA METALLURGICA, 1973, 21 (02) :173-179

[10] EVALUATION OF SLIP PATTERNS OBSERVED IN ASSOCIATION WITH DEFORMATION TWINS IN MO-35 AT PERCENT RE ALLOY [J].

MAHAJAN, S .

JOURNAL OF PHYSICS F-METAL PHYSICS, 1972, 2 (01) :19-&

← 1 2 →