Crystal Structure of TiAl

Duwez, Pol; Taylor, Jack L.

doi:10.1007/bf03397651

Cited by 25 publications

(14 citation statements)

References 2 publications

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“…22,23) The alloy phases for the Ti-Zr alloys have been reported to be as follows: for dental cast TiZr alloys with 39 to 85% Zr (25 to 75 mol% Zr), a martensitic structure 0 ; 10) for quenched alloys with Zr ! 30%, þ ; 13,24) and for quenched 60% Zr (50 mol% Zr) alloys, a precipitated hexagonal crystal structure of the !. 25) Phase transformations or the existence of secondary phases for the Ti-Zr alloys may drastically improve the grindability of titanium.…”

Section: Introductionmentioning

confidence: 99%

Grindability of Dental Cast Ti-Zr Alloys

2009

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The purpose of this study was to improve the grindability of titanium by alloying with zirconium. The grindability of dental cast Ti-Zr alloys (10,20,30, 40 and 50 mass% Zr) was evaluated using a carborundum wheel. The Ti-Zr alloys up to 30 mass% Zr formed an structure, and the 40 mass% Zr and 50 mass% Zr alloys formed an 0 structure. The Ti-40 mass% Zr alloy at up to 1000 m/min and the Ti-50 mass% Zr alloy at up to 1250 m/min exhibited significantly higher grindability than titanium. More than twice the volume of metal was removed from the alloys than from titanium per minute. The improved grindability could be attributed to the 0 structure in addition to the decrease in elongation. The Ti-Zr alloys, which formed an 0 phase structure, are candidates for use as machinable biomaterial in dental applications.

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Section: Introductionmentioning

confidence: 99%

Grindability of Dental Cast Ti-Zr Alloys

2009

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“…The tilts employed in these experiments were only 0.397 and c ϭ 0.405 nm for the ␥ m phase. [27][28][29] This is an assumption, since the parent ␣ phase is disordered at high about 1 deg, since both phases were close to zone-axis orientations when the interface was edge-on. All images and temperatures, the ␥ M phase may also be initially disordered at high temperatures during transformation, and both, subsediffraction patterns were taken on film and printed using standard photographic procedures, and the prints were quently, order during cooling to room temperature.…”

Section: Introductionmentioning

confidence: 99%

Static and in-situ high-resolution transmission electron microscopy investigations of the atomic structure and dynamics of massive transformation interfaces in a Ti-Al alloy

Howe

Reynolds

Vasudevan

2002

Metall Mater Trans A

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Static and in-situ high-resolution transmission electron microscopy (HRTEM) and three-dimensional near-coincident-site (NCS) atomic modeling were used to determine the atomic structure, growth mechanisms, and dynamics of massive transformation interfaces in a Ti-Al alloy. Results from these experiments show that massive ␥ M grains often have an irrational orientation relationship (OR) and structurally incommensurate (incoherent) interface with respect to the parent ␣ (retained ␣ 2 ) phase, although the degree of commensurability varies, depending on the orientation and planarity of a particular ␣ 2 /␥ M interface. In-situ HRTEM observations of several ␣ 2 /␥ M interfaces during growth revealed evidence of both continuous and stepwise mechanisms of interface motion, again, depending on the orientation of the interface plane for a given OR between the two phases. These findings are discussed within the context of the massive transformation and the motion of interphase boundaries in solids.

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“…For example, the addition of transition metals belonging to 8-, 9-and 10-groups in the Periodic Table reduces M s much significantly in comparison with those belonging to 5-group. [16][17][18][19][20][21][22][23][24][25][26] It was also reported that the phase transformation in -Ti alloys is affected by the density of d-electrons. 27) Thus, the addition of 3d-transition metals should change the phase stability of bcc and martensite phases due to the change in the d-electron density.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu Addition on Shape Memory Behavior of Ti-18 mol%Nb Alloys

et al. 2007

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Shape memory characteristics of Ti-18 mol%Nb alloys containing 3, 4, 5 and 6 mol%Cu (termed Ti18Nb3Cu, Ti18Nb4Cu, Ti18Nb5Cu and Ti18Nb6Cu, respectively) were investigated and effects of Cu addition on shape memory behavior was clarified. The alloys fabricated by Ar arc-melting method were cold-rolled with 98% reduction thickness and solution-treated at 1273 K for 1.8 ks followed by quenching into water. It was found by -2 X-ray diffraction analysis (XRD) at room temperature (RT) that Ti18Nb3Cu is composed of 00 (c-centered tetragonal)martensite phase and (bcc) parent phase. The other alloys with higher Cu contents are single phase. These results indicate that 6 mol%Cu is completely dissolved in Ti-18 mol%Nb alloys. Besides, the lattice parameter of phase is decreased by Cu addition with a rate of 0:2 Â 10 À3 nm/mol%Cu, and then, the atomic radius of Cu in Ti-18 mol%Nb alloys is estimated to be 0.130 nm. By tensile test it was found that (1) shape recovery strain of Ti18Nb3Cu reaches 3% by heating after deformation, (2) Ti18Nb4Cu exhibits superelasticity at RT, and (3) either shape memory effect or superelasticity does not appear at RT for Ti18Nb5Cu and Ti18Nb6Cu. Besides, the stress for slip deformation is increased by Cu addition with a rate of 50 MPa/mol%Cu. By tensile tests at cryogenic temperatures, the martensitic transformation start temperature (M s ) of Ti18Nb5Cu is determined to be 75 K, and the Cu addition to Ti-18 mol%Nb alloys decreases M s with a rate of 100 K/ mol%Cu. Moreover, more than 5% in transformation strain is observed for Ti18Nb5Cu at 173 K. It was concluded that Cu is an effective additional element in order to improve shape memory and superelastic properties of Ti-Nb alloys.

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Crystal Structure of TiAl

Cited by 25 publications

References 2 publications

Grindability of Dental Cast Ti-Zr Alloys

Grindability of Dental Cast Ti-Zr Alloys

Static and in-situ high-resolution transmission electron microscopy investigations of the atomic structure and dynamics of massive transformation interfaces in a Ti-Al alloy

Effect of Cu Addition on Shape Memory Behavior of Ti-18 mol%Nb Alloys

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