Microstructure and mechanical properties of directionally solidified high-Nb containing Ti–Al alloys

Duan, Qiuqi; Luan, Qingdong; Liu, Jing; Peng, Leilei

doi:10.1016/j.matdes.2010.02.022

Cited by 21 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So, base on composite technology, it is necessary to find another method to overcome the ductility deterioration of TiB 2 /TiAl composite, or even to improve its ductility to get it with high strength and good ductility. Element alloying, which is achieved by introducing substitutional atoms into materials, has been proved can improve the ductility of TiAl alloy (Duan et al 2010 ; Liu and Nash 2011 ; Kawabata et al 1998 ; Music and Schneider 2006 ). So, we believe that if the alloying elements, which are beneficial to the ductility of TiAl alloy, are added to TiB 2 /TiAl composite, the composite is hopeful to possess high strength and good ductility simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mn, Fe and Co on the compression strength and ductility of in situ nano-sized TiB2/TiAl composites

et al. 2015

View full text Add to dashboard Cite

The element of Fe can enhance the strength of TiB2/TiAl composite, but it is detrimental to the ductility of the composite due to the existence of large bulk TiB2 phase at grain boundary. The element of Mn is beneficial to the ductility of TiB2/TiAl composite, of which the fracture strain increases from 15.9 to 17.9 % with the addition of 2 at.% Mn. The element of Co can improve the strength and ductility of TiB2/TiAl composite simultaneously. With the addition of 2 at.% Co, the ultimate compression strength of TiB2/TiAl composite increases from 1829 to 1906 MPa and the fracture strain increases from 15.9 to 17.2 %.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Mn, Fe and Co on the compression strength and ductility of in situ nano-sized TiB2/TiAl composites

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Under the loading conditions that promote crack propagation, the plasticity of the as-cast alloy is too low and, thus, the determined compressive strength remains unachievable. It is believed [2,24,36,52,57,61,72,74] that this issue can be solved by attaining another microstructure of alloys (for example, convoluted) to ensure much higher crack resistance.…”

Section: Resultsmentioning

confidence: 99%

Structure and properties of titanium-aluminum alloys doped with niobium and tantalum

Bondar

Witusiewicz

Hecht

et al. 2011

Powder Metall Met Ceram

View full text Add to dashboard Cite

melted in a laboratory arc furnace from pure components (~99.9 wt.%) are studied by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), differential thermal analysis (DTA), and compression testing. The alloys are found to consist mainly of a superfine lamellar structure of decomposition β → α → α + γ → α 2 + γ and contain tiny islands of the γ phase and also the β phase at 12 at.% Nb or Ta. The CALPHAD approach is used to obtain a thermodynamic description of the Al−Nb−Ta−Ti system, which adequately reproduces the experimental data. The compression tests performed at room temperature show that the ternary alloys with 45 at.% Al are characterized by higher strength but lower plasticity than the alloys with 47 at.% Al. For the Ti 46 Nb 8 Al 46 and Ti 46 Ta 8 Al 46 alloys, high strength in the temperature range 20−800°C and a drop in plasticity to 2−4% at 200−600°C are revealed. Among the quaternary alloys examined, the best combination of strength and plasticity (σ 02 = 1043 MPa, σ ult = 1612 MPa, ε pl = 12.4%) is exhibited by the Ti 47 Nb 4 Ta 4 Al 45 alloy.

show abstract

“…Soft tribo-layer formation and in-situ synthesis of TiC with high inherent hardness are the reasons of such excellent tribological feature [26]. Improvement in the elevated-temperature ductility and room-temperature strength of TiAl material was attributed to the formation of laths due to the addition of Sn [27]. It is reported that Ru has an effective impact on both ductility and strength of TiAl materials through grain refinement mechanism [28].…”

Section: Introductionmentioning

confidence: 99%

Role of Ti3AlC2 MAX phase on characteristics of in-situ synthesized TiAl intermetallics. Part II: Phase evolution

et al. 2021

View full text Add to dashboard Cite

In this research, the 2nd part of a series of papers on the processing and characterization of TiAl–Ti3AlC2 composites, the phase evolution during the manufacturing process was investigated by X-ray diffraction (XRD) analysis and Rietveld refinement method. Metallic Ti and Al powders with different amounts of previously-synthesized Ti3AlC2 additives (10, 15, 20, 25 and 30 wt%) were ball-milled and densified by spark plasma sintering (SPS) under 40 MPa for 7 min at 900 °C. Before the sintering process, XRD test verified that the powder mixtures contained metallic Ti and Al as well as Ti3AlC2 and TiC (lateral phase synthesized with Ti3AlC2) phases. In the sintered composites, the in-situ synthesis of TiAl and Ti3Al intermetallics as well as the presence of Ti3AlC2 and the formation and Ti2AlC MAX phases were disclosed. The weight percentage of each phase in the final composition of the samples and the crystallite size of different phases were calculated by the Rietveld refinement method based on the XRD patterns. The size of Ti3AlC2 crystallites in sintered samples was compared with the crystallite size of synthesized Ti3AlC2 powder.

show abstract

Microstructure and mechanical properties of directionally solidified high-Nb containing Ti–Al alloys

Cited by 21 publications

References 19 publications

Effect of Mn, Fe and Co on the compression strength and ductility of in situ nano-sized TiB2/TiAl composites

Effect of Mn, Fe and Co on the compression strength and ductility of in situ nano-sized TiB2/TiAl composites

Structure and properties of titanium-aluminum alloys doped with niobium and tantalum

Role of Ti3AlC2 MAX phase on characteristics of in-situ synthesized TiAl intermetallics. Part II: Phase evolution

Contact Info

Product

Resources

About