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Structural and phase stability of aluminum(3) titanium with modifying transition metal elements.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structural and phase stability of aluminum(3) titanium with modifying transition metal elements./
Author:	Yang, Tzyy-Yih.
Description:	1 online resource (138 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 57-07, Section: B.
Contained By:	Dissertations Abstracts International57-07B.
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9601085click for full text (PQDT)
ISBN:	9798207970073

Structural and phase stability of aluminum(3) titanium with modifying transition metal elements.
Yang, Tzyy-Yih.

Structural and phase stability of aluminum(3) titanium with modifying transition metal elements. - 1 online resource (138 pages)

Source: Dissertations Abstracts International, Volume: 57-07, Section: B.

Thesis (Ph.D.)--University of Southern California, 1994.

Includes bibliographical references

The microstructure and phase stability of the aluminum-rich Al-Ti alloys with modifying transition metal elements were studied. Four intermediate phases, including Al5Ti3, Al2Ti, the LP structures and Al3Ti, were observed in the binary Al-rich Al-Ti system. All of the four phases were tetragonal and their unit cells were all based on the cubic L12 structure. Small amounts of iron, copper or nickel can convert tetragonal Al3Ti or Al2Ti into the cubic L12 structure. A previously unreported polymorph of Al2Ti, Al2TiIII, was observed precipitating within the L12 phases in the Fe- and Cu-modified alloys in the present study. The Al2TiIII structure was not observed in the binary Al-Ti or Ni-modified Al-Ti alloys. A more detailed phase diagram of Al-Ti-Fe in the region between the L12 phase and the Al-Ti binary phases at 800°C was determined. Added Fe changed the stacking structure of Al2Ti and the domain size of the LP structures. More polymorphs of Al2Ti were hence observed. Because the width of the Al2Ti-L12 two-phase-region increased as the concentration of Fe increased, the L12 phase was regarded to be transformed from the Al2Ti phase. The mechanical properties of some other intermetallic alloys with the L12 structure, such as Al69.5Fe5.5Zr25, Ni3Al and Ni3Fe were compared to the modified Al-Ti alloys. Even though small amounts of Fe significantly reduced the hardness of the Al-rich Al-Ti alloys, the modified Al-Ti alloys remained brittle and had weak cleavage strength in the (001) planes.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798207970073Subjects--Topical Terms:

543314
Materials science.
Subjects--Index Terms:

aluminum titanium alloyIndex Terms--Genre/Form:

542853
Electronic books.

Structural and phase stability of aluminum(3) titanium with modifying transition metal elements.
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100 1 $a Yang, Tzyy-Yih. $3 3703364
245 1 0 $a Structural and phase stability of aluminum(3) titanium with modifying transition metal elements.
264 0 $c 1994
300 $a 1 online resource (138 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Dissertations Abstracts International, Volume: 57-07, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Goo, Edward.
502 $a Thesis (Ph.D.)--University of Southern California, 1994.
504 $a Includes bibliographical references
520 $a The microstructure and phase stability of the aluminum-rich Al-Ti alloys with modifying transition metal elements were studied. Four intermediate phases, including Al5Ti3, Al2Ti, the LP structures and Al3Ti, were observed in the binary Al-rich Al-Ti system. All of the four phases were tetragonal and their unit cells were all based on the cubic L12 structure. Small amounts of iron, copper or nickel can convert tetragonal Al3Ti or Al2Ti into the cubic L12 structure. A previously unreported polymorph of Al2Ti, Al2TiIII, was observed precipitating within the L12 phases in the Fe- and Cu-modified alloys in the present study. The Al2TiIII structure was not observed in the binary Al-Ti or Ni-modified Al-Ti alloys. A more detailed phase diagram of Al-Ti-Fe in the region between the L12 phase and the Al-Ti binary phases at 800°C was determined. Added Fe changed the stacking structure of Al2Ti and the domain size of the LP structures. More polymorphs of Al2Ti were hence observed. Because the width of the Al2Ti-L12 two-phase-region increased as the concentration of Fe increased, the L12 phase was regarded to be transformed from the Al2Ti phase. The mechanical properties of some other intermetallic alloys with the L12 structure, such as Al69.5Fe5.5Zr25, Ni3Al and Ni3Fe were compared to the modified Al-Ti alloys. Even though small amounts of Fe significantly reduced the hardness of the Al-rich Al-Ti alloys, the modified Al-Ti alloys remained brittle and had weak cleavage strength in the (001) planes.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 543314
650 4 $a Metallurgy. $3 535414
653 $a aluminum titanium alloy
653 $a titanium
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a University of Southern California. $3 700129
773 0 $t Dissertations Abstracts International $g 57-07B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9601085 $z click for full text (PQDT)