DOI: 10.1557/proc-364-129. Core Structure And Mobility Of a <101] Dislocations In L1<sub>0</sub> TiAl

Core Structure And Mobility Of a <101] Dislocations In L10 TiAl

10.1557/proc-364-129

Crossref journal-article

Springer Science and Business Media LLC

MRS Proceedings (297)

Abstract

AbstractAn empirical atomistic potential, fit to the structural and elastic properties of L10 TiAl within the embedded atom method (EAM), is used to simulate the mobility of two possible planar forms of a<101] dislocations in a model L10 compound. The two configurations examined were: the planar SISF-APB-CSF coupled (P core) and the decomposed 1/2<110]-SISF-SESF coupled (D core). Six different line orientations are considered for the P core: 0° (screw), 30°, 60°, 90° (edge), 120° and 150°. The ‘ideal’ friction stress at 0°K of a<101] dislocations in the P form is found to be a function of line orientation, with the close packed line directions, <101] (screw) and <110] (60°), having friction stresses ranging from 0.001–0.002μ. Previously calculated results on the friction stress of a/2<110] dislocations, using an identical potential are consistently higher than the friction stress of a<101] dislocations. Simulations of the interaction of glide strains with the D core for the 60° (line directions < 110]) and 120° (line directions <011]) orientations show that the Shockley partial trailing the SESF in the D core is strongly pinned. The dislocation moves by extension of SESF when glide stresses are applied with SESF as the trailing fault.

Bibliography

Rao, S., Woodward, C., Simmons, J., & Dimiduk, D. (1994). Core Structure And Mobility Of a <101] Dislocations In L10 TiAl. MRS Proceedings, 364.

Authors 4

S. Rao (first)
C. Woodward (additional)
J. Simmons (additional)
D. Dimiduk (additional)

References 34 Referenced 7

10.1557/PROC-186-265
10.1080/01418618608242846
{'key': 'S1946427400427430_ref012', 'volume-title': 'Special issue Mechanisms of deformation and strength in Advanced Materials', 'author': 'Dimiduk', 'year': '1990'} / Special issue Mechanisms of deformation and strength in Advanced Materials by Dimiduk (1990)
32). Simmons J.P. , Mills M. and Rao S. , this conference proceedings.
31). Rao S. , Woodward C. and Parthasarathy T.A. , to be submitted to Phil. Mag A.
{'key': 'S1946427400427430_ref030', 'volume-title': '‘Selected Values of Thermodynamic Properties of Binary Alloys’', 'author': 'Hultgren', 'year': '1963'} / ‘Selected Values of Thermodynamic Properties of Binary Alloys’ by Hultgren (1963)
27). Freeman A. et al., unpublished calculations.
10.1016/S0036-9748(88)80064-4
{'key': 'S1946427400427430_ref013', 'volume': '3', 'author': 'Grinberg', 'year': '1989', 'journal-title': 'Institute of Metal Physics, Ural division of the USSR Academy of Science'} / Institute of Metal Physics, Ural division of the USSR Academy of Science by Grinberg (1989)
11). Stucke M.A. , Vasudevan V. and Dimiduk D. , Mat. Sci. Eng., in press.
{'key': 'S1946427400427430_ref029', 'volume-title': '‘A Handbook of Lattice Spacings and Structure of Metals and Alloys - Vols 1 and 2’', 'author': 'Pearson', 'year': '1987'} / ‘A Handbook of Lattice Spacings and Structure of Metals and Alloys - Vols 1 and 2’ by Pearson (1987)
10.1557/PROC-186-277
20). Freeman A. , private communication.
10.1557/JMR.1993.2554
10.1016/0001-6160(85)90245-7
{'key': 'S1946427400427430_ref003', 'volume-title': 'PhD thesis', 'author': 'Sriram', 'year': '1994'} / PhD thesis by Sriram (1994)
10.1016/0956-7151(90)90106-Q
{'key': 'S1946427400427430_ref010', 'first-page': '471', 'volume-title': 'Proc. Symp on High Temperature ordered intermetallic alloys 5', 'author': 'Stucke', 'year': '1993'} / Proc. Symp on High Temperature ordered intermetallic alloys 5 by Stucke (1993)
{'key': 'S1946427400427430_ref034', 'first-page': '1', 'volume': '5', 'author': 'Vitek', 'year': '1974', 'journal-title': 'Crystal Lattice Defects'} / Crystal Lattice Defects by Vitek (1974)
10.1002/pssb.2220550105 / Phys. Stat. Sol. by Grinberg (1973)
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10.1557/PROC-213-125
{'key': 'S1946427400427430_ref004', 'volume-title': 'PhD thesis', 'author': 'Phan', 'year': '1993'} / PhD thesis by Phan (1993)
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{'key': 'S1946427400427430_ref023', 'first-page': '30', 'volume-title': 'Proc. of the conference to celebrate the 50th anniversary of the concept of dislocations in crystals', 'author': 'Vitek', 'year': '1985'} / Proc. of the conference to celebrate the 50th anniversary of the concept of dislocations in crystals by Vitek (1985)
7). Louchet F. and Viguier B. , submitted to Phil. Mag. A, preprint ; this conference proceedings.
10.1080/01418618808204682
9). Sun Y. , this conference proceedings.
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10.1557/PROC-288-335
10.1557/JMR.1992.1735
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10.1557/PROC-82-175
10.1080/14786435808565804

Dates

Type	When
Created	14 years, 5 months ago (April 5, 2011, 10:26 p.m.)
Deposited	4 years, 6 months ago (Feb. 24, 2021, 4:02 p.m.)
Indexed	1 year, 10 months ago (Oct. 30, 2023, 3:05 p.m.)
Issued	31 years, 8 months ago (Jan. 1, 1994)
Published	31 years, 8 months ago (Jan. 1, 1994)
Published Online	14 years, 6 months ago (Feb. 22, 2011)
Published Print	31 years, 8 months ago (Jan. 1, 1994)

Funders 0

None

BibTeX

@article{Rao_1994, title={Core Structure And Mobility Of a <101] Dislocations In L10 TiAl}, volume={364}, ISSN={1946-4274}, url={http://dx.doi.org/10.1557/proc-364-129}, DOI={10.1557/proc-364-129}, journal={MRS Proceedings}, publisher={Springer Science and Business Media LLC}, author={Rao, S. and Woodward, C. and Simmons, J. and Dimiduk, D.}, year={1994} }

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