Microstructure, deformation and fracture characteristics of an Al67Ni8Ti25 intermetallic alloy

Turner, Caitlin; Powers, W. O.; Wert, J. A.

doi:10.1016/0001-6160(89)90296-4

Cited by 111 publications

(32 citation statements)

References 20 publications

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“…Systematic studies on cubic Al 3 Ti based alloys containing such transition metals 6 ' 7 suggest that alloys modified by additions of Cr or Mn are the most ductile, and are the softest of the alloy series examined. Transmission electron microscope examinations show that dislocations may be clearly dissociated after room temperature deformation, in contrast to earlier studies, for example, on Ni modified alloys 8 where no dissociation was apparent, and more distinctly dissociated than on alloys modified with Fe. 9 In recent studies 10 - 11 of Cr and Mn modified alloys, it is shown that both bend and tensile ductility can be achieved, albeit limited, and that the materials become stronger when tested at low temperatures (down to liquid nitrogen temperature).…”

Section: Introductioncontrasting

confidence: 99%

Dislocations in plastically deformed L1₂ compounds based on Al₃Ti

Morris

1992

J. Mater. Res.

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The fine structure of dislocations in lightly deformed samples of several cubic ordered alloys with composition based on Al 3 Ti has been examined by weak beam electron microscopy. For all the materials examined the dislocations tend to dissociate into two 1/2(110) partials separated by APB. Dislocation dissociation is not complete at very small strains and the strain required to dissociate, as well as the dissociation distance, varies from one alloy to another. Improvements in ductility achieved by alloying are directly related to the ease and extent of this dissociation.

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Section: Introductioncontrasting

confidence: 99%

Dislocations in plastically deformed L1₂ compounds based on Al₃Ti

Morris

1992

J. Mater. Res.

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“…11) In the present experiments, it has been confirmed that densification of TiB 2 occurs above 1473 K under the existence of (Al,Ni) 3 Ti. This fact indicates that some chemical reaction occurs at the interface of TiB 2 and (Al,Ni) 3 Ti.…”

Section: )supporting

confidence: 74%

Mechanical Properties of TiB2–Al3Ti and TiB2–(Al,Ni)3Ti Composites

Yoshida

Takafumi

2012

Mater. Trans.

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Composites of TiB 2 -tetragonal Al 3 Ti and TiB 2 -cubic (Al,Ni) 3 Ti have been fabricated using spark plasma sintering method at the temperature between 1173 and 1573 K. When TiB 2 (Al,Ni) 3 Ti specimens were sintered between 1273 and 1373 K, (Al,Ni) 3 Ti filled in space between TiB 2 grains and dense samples were obtained. On the other hand, when TiB 2 (Al,Ni) 3 Ti specimens were sintered at above 1473 K, (Al,Ni) 3 Ti evaporated and monolithic TiB 2 were obtained. A similar results have been obtained for the TiB 2 Al 3 Ti composites. The highest bending strength of TiB 2 (Al,Ni) 3 Ti specimens were 660 MPa obtained for TiB 2 30 mass%(Al,Ni) 3 Ti sintered at 1373 K. The highest bending strength of TiB 2 Al 3 Ti composites were 610 MPa obtained for TiB 2 30 mass%Al 3 Ti sintered at 1473 K. The Vickers hardness of TiB 2 (Al,Ni) 3 Ti composites increased as the sintering temperature increased and the maximum value of 2100 Hv were obtained by the sintering at 1573 K.

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“…supercell results and those predicted by the cluster expansion for random mixing of Al and Zn atoms. The supercell calculations show that the trend in the relative stability of L1 2 , DO 22 and DO 23 phases is similar in all cases considered. As Al (or Zn) is replaced by Zn (or Al), the thermodynamic stability of L1 2 is enhanced while the opposite is true for DO 22 and DO 23 structures.…”

Section: A2 Zero-temperature Phase Stability Of Al-zn-tm Intermetmentioning

confidence: 73%

“…An alternate to Al 3 Sc was sought because it is very expensive and has too high a diffusion rate in Al for creep resistance at high temperatures. Cubic Al 3 Zr is metastable (tetragonal D0 23 is the stable structure) and this is a concern for long time creep resistance.…”

Section: Table Of Contents Introductionmentioning

confidence: 99%

Final Report for Department of Energy Grant No. DE-FG02-02ER45997, "Alloy Design of Nanoscale Precipitation Strengthened Alloys: Design of a Heat Treatable Aluminum Alloy Useful to 400C"

Fine¹,

Ghosh²,

Isheim³

et al. 2006

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A creep resistant high temperature Al base alloy made by conventional processing procedures is the subject of this research. The Ni-based superalloys have volume fractions of cubic L1 2 phase precipitates near 50 %. This is not attainable with Al base alloys and the approach pursued in this research was to add L1 2 structured precipitates to the Al-Ni eutectic alloy, 2.7 at. % Ni -97.3 at. % Al. The eutectic reaction gives platelets of Al 3 Ni (DO 11 structure) in an almost pure Al matrix. The Al 3 Ni platelets give reinforcement strengthening while the L1 2 precipitates strengthen the Al alloy matrix. Based on prior research and the extensive research reported here modified cubic L1 2 Al 3 Zr is a candidate. While cubic Al 3 Zr is metastable, the stable phase is tetragonal, only cubic precipitates were observed after 1600 hrs at 425° C and they hardly coarsened at all with time at this temperature. Also addition of Ti retards the cubic to tetragonal transformation; however, a thermodynamically stable precipitate is desired. A very thorough ab initio computational investigation was done on the stability of L1 2 phases of composition, (Al,X) 3 (Zr,Ti) and the possible occurrence of tie lines between a stable L1 2 phase and the Al alloy terminal solid solution. Precipitation of cubic (Al (1-x) Zn x ) 3 Zr in Al was predicted by these computations and subsequently observed by experiment (TEM).To test the combined reinforcement-precipitation concept to obtain a creep resistant Al alloy, Zr and Ti were added to the Al-Ni eutectic alloy. Cubic L1 2 precipitates did form. The first and only Al-NiZr-Ti alloy tested for creep gave a steady state creep rate at 375° C of 8 X 10 -9 under 20MPa stress. The goal is to optimize this alloy and add Zn to achieve a thermodynamically stable precipitate.

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Microstructure, deformation and fracture characteristics of an Al67Ni8Ti25 intermetallic alloy

Cited by 111 publications

References 20 publications

Dislocations in plastically deformed L1₂ compounds based on Al₃Ti

Dislocations in plastically deformed L1₂ compounds based on Al₃Ti

Mechanical Properties of TiB<sub>2</sub>–Al<sub>3</sub>Ti and TiB<sub>2</sub>–(Al,Ni)<sub>3</sub>Ti Composites

Final Report for Department of Energy Grant No. DE-FG02-02ER45997, "Alloy Design of Nanoscale Precipitation Strengthened Alloys: Design of a Heat Treatable Aluminum Alloy Useful to 400C"

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Microstructure, deformation and fracture characteristics of an Al67Ni8Ti25 intermetallic alloy

Cited by 111 publications

References 20 publications

Dislocations in plastically deformed L12 compounds based on Al3Ti

Dislocations in plastically deformed L12 compounds based on Al3Ti

Mechanical Properties of TiB<sub>2</sub>&ndash;Al<sub>3</sub>Ti and TiB<sub>2</sub>&ndash;(Al,Ni)<sub>3</sub>Ti Composites

Final Report for Department of Energy Grant No. DE-FG02-02ER45997, "Alloy Design of Nanoscale Precipitation Strengthened Alloys: Design of a Heat Treatable Aluminum Alloy Useful to 400C"

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Dislocations in plastically deformed L1₂ compounds based on Al₃Ti

Dislocations in plastically deformed L1₂ compounds based on Al₃Ti

Mechanical Properties of TiB<sub>2</sub>–Al<sub>3</sub>Ti and TiB<sub>2</sub>–(Al,Ni)<sub>3</sub>Ti Composites