DOI: 10.1557/proc-133-705. The mechanisms of plastic deformation of rapidly solidified Al3Ti and Al67Ni8Ti25 intermetallic compounds.

The mechanisms of plastic deformation of rapidly solidified Al3Ti and Al67Ni8Ti25 intermetallic compounds.

10.1557/proc-133-705

Crossref journal-article

Springer Science and Business Media LLC

MRS Proceedings (297)

Abstract

ABSTRACTThe dislocation structures in rapidly solidified Al3Ti with the DO22 structure and the ternary Al-25Ti-8Ni (at.%) alloy with the L12 structure deformed in compression in the temperature range of 25 to 800°C have been studied by transmission electron microscopy. The room temperature deformation microstructure of the Al3Ti compound is characterized by the presence of stacking faults/order twins on {111} planes bounded by partial dislocations with Burgers vector b=1/6<112], as reported by others. At intermediate temperatures, besides the stacking faults, slip is also observed as bands on the {001] plane delineated by dislocations with b=1/2<110] which bound APB's. At 600°C, the reported increase in ductility is associated here with additional slip on the {001)<110], {001)[100] and {001)[010] systems. Dislocations with b=<110] exist as pairs of partial dislocations with b=1/2<110] connected by APB's. The mean separation between the partials was measured to be 30 nm, corresponding to an APB energy of ≍32 mJ.m-2 on the (001) plane. Observations also indicate that the APB energy is anisotropic, i.e., is considerably higher on the {111} planes compared to the {001) plane. The deformation microstructure of the Al-25Ti-8Ni L12 alloy is characterized by slip of dislocations with b=<110> gliding on {111} planes, a major fraction of which exist as dipoles. Following deformation at 300°C, there is essentially no evidence of dissociation of these dislocations, although some dissociated dislocations on (001) having b=l/2<110> are also observed. With an increase in temperature, there is a considerable increase in dislocation activity and strong evidence for 1/2<110> dissociated dislocations is present.

Bibliography

Vasudevan, V. K., Wheeler, R., & Fraser, H. L. (1988). The mechanisms of plastic deformation of rapidly solidified Al3Ti and Al67Ni8Ti25 intermetallic compounds. MRS Proceedings, 133.

Authors 3

Vijay K. Vasudevan (first)
Robert Wheeler (additional)
Hamish L. Fraser (additional)

References 15 Referenced 5

10.1002/pssa.2210900225
14. Wheeler R. , Vasudevan V. K. and Fraser H. L. , to be published.
10.1080/01418618608242882
11. Vanderschaeve G. and Escaig B. , in: Dislocations in Solids, 319 (1985).
9. Wheeler R. , Vasudevan V. K. and Fraser H. L. , to be published.
{'key': 'S1946427400510598_ref006', 'first-page': '712', 'volume': '72', 'author': 'Seibold', 'year': '1972', 'journal-title': 'Z. Metallk.'} / Z. Metallk. by Seibold (1972)
{'key': 'S1946427400510598_ref005', 'first-page': '99', 'volume': '56', 'author': 'Raman', 'year': '1965', 'journal-title': 'Z. Metallk.'} / Z. Metallk. by Raman (1965)
3. Yamaguchi M. , Shirai Y. , Umakoshi Y. , in: Dispersion Strengthened Aluminum Alloys, Kim Y. W. and Griffith W. (eds.), in press (1988).
{'key': 'S1946427400510598_ref012', 'first-page': '145', 'volume': '218', 'author': 'Flinn', 'year': '1960', 'journal-title': 'Trans. Met. Soc. AIME'} / Trans. Met. Soc. AIME by Flinn (1960)
10.1080/01418618708209869
10. Wheeler R. , Vasudevan V. K. and Fraser H. L. , to be published.
10.1080/01418618808209943
10.1557/PROC-81-275
10.1016/S0036-9748(88)80094-2
8. Turner C. D. , Powers W. O. and Wert J. A. , unpublished research.

Dates

Type	When
Created	14 years, 5 months ago (March 6, 2011, 1:44 a.m.)
Deposited	4 years, 6 months ago (Feb. 24, 2021, 3:35 p.m.)
Indexed	3 years, 4 months ago (April 1, 2022, 4:45 p.m.)
Issued	37 years, 7 months ago (Jan. 1, 1988)
Published	37 years, 7 months ago (Jan. 1, 1988)
Published Online	14 years, 6 months ago (Feb. 26, 2011)
Published Print	37 years, 7 months ago (Jan. 1, 1988)

Funders 0

None

BibTeX

@article{Vasudevan_1988, title={The mechanisms of plastic deformation of rapidly solidified Al3Ti and Al67Ni8Ti25 intermetallic compounds.}, volume={133}, ISSN={1946-4274}, url={http://dx.doi.org/10.1557/proc-133-705}, DOI={10.1557/proc-133-705}, journal={MRS Proceedings}, publisher={Springer Science and Business Media LLC}, author={Vasudevan, Vijay K. and Wheeler, Robert and Fraser, Hamish L.}, year={1988} }

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  "abstract": "<jats:title>ABSTRACT</jats:title><jats:p>The dislocation structures in rapidly solidified Al<jats:sub>3</jats:sub>Ti with the DO<jats:sub>22</jats:sub> structure and the ternary Al-25Ti-8Ni (at.%) alloy with the L1<jats:sub>2</jats:sub> structure deformed in compression in the temperature range of 25 to 800\u00b0C have been studied by transmission electron microscopy. The room temperature deformation microstructure of the Al<jats:sub>3</jats:sub>Ti compound is characterized by the presence of stacking faults/order twins on {111} planes bounded by partial dislocations with Burgers vector b=1/6&lt;11<jats:overline>2</jats:overline>], as reported by others. At intermediate temperatures, besides the stacking faults, slip is also observed as bands on the {001] plane delineated by dislocations with b=1/2&lt;110] which bound APB's. At 600\u00b0C, the reported increase in ductility is associated here with additional slip on the {001)&lt;110], {001)[100] and {001)[010] systems. Dislocations with b=&lt;110] exist as pairs of partial dislocations with b=1/2&lt;110] connected by APB's. The mean separation between the partials was measured to be 30 nm, corresponding to an APB energy of \u224d32 mJ.m<jats:sup>-2</jats:sup> on the (001) plane. Observations also indicate that the APB energy is anisotropic, i.e., is considerably higher on the {111} planes compared to the {001) plane. The deformation microstructure of the Al-25Ti-8Ni L1<jats:sub>2</jats:sub> alloy is characterized by slip of dislocations with b=&lt;110&gt; gliding on {111} planes, a major fraction of which exist as dipoles. Following deformation at 300\u00b0C, there is essentially no evidence of dissociation of these dislocations, although some dissociated dislocations on (001) having b=l/2&lt;110&gt; are also observed. With an increase in temperature, there is a considerable increase in dislocation activity and strong evidence for 1/2&lt;110&gt; dissociated dislocations is present.</jats:p>",
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