Brittle Fracture of TiAl Alloys and NiTi Memory Alloys

Chen, J.H.; Cao, Rui

doi:10.1016/b978-0-12-800765-5.00009-5

Cited by 2 publications

(2 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the trans-lamellar fracture surface, the characteristics show cleavage ridges with a crack propagating direction [22]. In the inter-lamellar fracture, the characteristics show a smooth surface without a crack propagating direction [22]. Figure 5e shows the inter-lamellar surface and trans-lamellar surface inside the blue and red color circles.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Inter-lamellar and trans-lamellar facets are formed on the fracture surface based on phase presences [21]. In the trans-lamellar fracture surface, the characteristics show cleavage ridges with a crack propagating direction [22]. In the inter-lamellar fracture, the characteristics show a smooth surface without a crack propagating direction [22].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure Evolution and Mechanical Properties of Spark Plasma Sintered Manganese Addition on Ti-48Al-2Cr-2Nb Alloys

Annamalai

Srikanth

Varshney

et al. 2020

Metals

View full text Add to dashboard Cite

Titanium aluminide (TiAl) is one of the most promising materials for aerospace applications. It is a suitable replacement for nickel-based superalloys predominantly used in these applications. Titanium aluminide with superior processability is the main task in carrying out this work. A less brittle TiAl alloy was fabricated using spark plasma sintering by adding the nominal composition (2.5, 5, and 7.5 wt.%) of manganese (Mn) to Ti-48Al-2Cr-2Nb. The samples were sintered at 1150 °C using spark plasma sintering (SPS), which helped produce highly dense models with fine grain sizes at the high heating rate (here, 100 °C per minute). The effects produced by Mn additions on the densification, mechanical properties (yield strength, hardness, and % elongation), and microstructure of the Ti aluminide alloys are studied. Scanning electron microscopy (SEM) has been used to explore the sintered samples’ microstructures. The alloyed materials are entirely dissolved in the gamma matrix due to the manganese approaching its melting point. XRD and SEM analysis confirmed the new intermetallic related to Mn neither with titanium nor aluminum. The enhancement of % elongation at break is evident for the little improvement in the ductility of TiAl by the addition of Mn. The samples’ tensile fracture nature is also evidence for enhancement in the alloy’s % elongation.

show abstract

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of Spark Plasma Sintered Manganese Addition on Ti-48Al-2Cr-2Nb Alloys

Annamalai

Srikanth

Varshney

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

Micromechanism of Cold Deformation of Two-Phase Polycrystalline Ti–Al Alloy with Void

Feng

Wang

et al. 2019

Materials

View full text Add to dashboard Cite

Cold deformation behavior of polycrystalline metallic material is affected by intrinsic defects such as dislocations, voids, inclusions etc. Existing studies on α2(Ti3Al) + γfalse(TiAlfalse) two-phase Ti–Al alloy cover about deformation behavior mainly on macro scale. This paper focuses on the cold deformation mechanism of two-phase Ti–Al alloy at micro scale, and the role of voids in deformation process. Molecular dynamics simulations were performed to study the evolution of micro structure of material under uniaxial tension. Interaction between spherical nano voids with different size and position was also examined in the simulation. The results show that (1) In elastic stage, deformation of the two-phase is coordinated, but Ti3Al is more deformable; (2) In plastic stage, γ phase is the major dislocation source in two-phase alloy; (3) voids detracts the strength of the two-phase alloy, while the position of void affect the degree of this subtraction, voids located at the boundary of α2/γ phase have significant detraction to strength.

show abstract

Brittle Fracture of TiAl Alloys and NiTi Memory Alloys

Cited by 2 publications

References 36 publications

Microstructure Evolution and Mechanical Properties of Spark Plasma Sintered Manganese Addition on Ti-48Al-2Cr-2Nb Alloys

Microstructure Evolution and Mechanical Properties of Spark Plasma Sintered Manganese Addition on Ti-48Al-2Cr-2Nb Alloys

Micromechanism of Cold Deformation of Two-Phase Polycrystalline Ti–Al Alloy with Void

Contact Info

Product

Resources

About