Processing map for the hot working of near-α titanium alloy 685

Krishna, Varna; Prasad, Y. V. R. K.; Birla, N. C.; Rao, G. Sambasiva

doi:10.1016/s0924-0136(97)00102-7

Cited by 66 publications

(23 citation statements)

References 3 publications

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“…In previous reports, a similar domain at higher temperatures and lower strain rates has also been recorded by Semiatin [18] on the Tie6Ale4 V alloy with lamellar starting structure. It is widely recognized that high peak power dissipation efficiency is often associated with dynamic recrystallization [29] or superplasticity [15,30]. In order to validate whether superplasticity occurs in this domain, high temperature tensile testing has been carried out.…”

Section: Processing Mapmentioning

confidence: 99%

Characterization of the hot deformation behavior of a Ti–22Al–25Nb alloy using processing maps based on the Murty criterion

Zeng

et al. 2012

Intermetallics

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Section: Processing Mapmentioning

confidence: 99%

Characterization of the hot deformation behavior of a Ti–22Al–25Nb alloy using processing maps based on the Murty criterion

Zeng

et al. 2012

Intermetallics

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“…According to the experimental results of CP Ti grade 2, a band structure is transformed to an equiaxed structure at a deformation temperature of 800°C, a strain rate of 0.1 s −1 , and height reduction of 70.0% [14]. For IMI685 alloy, an acicular structure is transformed to a band structure in high temperature deformation [7]. The microstructure of the Ti-5.6Al-4.8Sn-2.0Zr alloy prior to isothermal compression is mainly consisted of the α phase and a small quantity of β phase, as shown in Fig.…”

Section: Original Microstructurementioning

confidence: 99%

“…It is well known that the final microstructure determines the mechanical properties of titanium alloys, and is very sensitive to the process parameters in high temperature deformation. Numerous investigations had been performed to characterize the deformation behavior of some high temperature titanium alloys, such as IMI834 [4][5][6][7][8][9]. For instance, Wanjara et al [4] had investigated the effect of process parameters on the flow stress [4] and the microstructural evolution [10][11] in the isothermal compression of IMI834 alloy at different strain rates and deformation temperatures in β single-phase region and α + β two-phase region.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution in the high temperature compression of Ti-5.6Al-4.8Sn-2.0Zr alloy

Luo

Pan

2010

Rare Metals

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Isothermal compression of a Ti-5.6Al-4.8Sn-2.0Zr alloy was conducted on a Thermecmaster-Z simulator at the deformation temperatures ranging from 960 to 1060°C, the strain rates ranging from 0.001 to 10.0 s −1 , and the maximum height reduction of 70.0%. In the two-phase region of the Ti-5.6Al-4.8Sn-2.0Zr alloy, the volume fraction of α phase decreases with an increase in deformation temperature, but the grain size has a slight variation with deformation temperature. The strain rate affects both morphologies and grain size of the α phase in the isothermal compression of the Ti-5.6Al-4.8Sn-2.0Zr alloy. The optimal height reduction also contributes to the small and well-distributed α phase in the isothermal compression of Ti-5.6Al-4.8Sn-2.0Zr alloy.

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“…They offer an improvement in the process of production as well as achieveing a better quality of product. Superplastic deformation (SPD) is an advanced forming process where higher degree of deformation applied to form complex shape of product whereas low rate forming process is required (Krishna, 1997). Dual phase materials have potential to be treated by SPD process with the additional requirement that the materials have ultra-fine grain structure.…”

Section: Advanced Processesmentioning

confidence: 99%

Metals for Biomedical Applications

Hermawan¹,

Ramdan²,

Djuansjah³

2011

Biomedical Engineering - From Theory to Applications

159

125

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Biomedical Engineering -From Theory to Applications 412 visible under X-ray imaging. Most of artificial implants are subjected to loads, either static or repetitive, and this condition requires an excellent combination of strength and ductility. This is the superior characteristic of metals over polymers and ceramics. Specific requirements of metals depend on the specific implant applications. Stents and stent grafts are implanted to open stenotic blood vessels; therefore, it requires plasticity for expansion and rigidity to maintain dilatation. For orthopaedic implants, metals are required to have excellent toughness, elasticity, rigidity, strength and resistance to fracture. For total joint replacement, metals are needed to be wear resistance; therefore debris formation from friction can be avoided. Dental restoration requires strong and rigid metals and even the shape memory effect for better results. In overall, the use of biomaterials in clinical practice should be approved by an authoritative body such as the FDA (United States Food and Drug Administration). The proposed biomaterial will be either granted Premarket Approval (PMA) if substantially equivalent to o n e u s e d b e f o r e F D A l e g i s l a t i o n o f 1 9 7 6 , o r h a s t o g o t h r o u g h a s e r i e s o f g u i d e d biocompatibility assessment. Common metals used for biomedical devicesUp to now, the three most used metals for implants are stainless steel, CoCr alloys and Ti alloys. The first stainless steel used for implants contains ~18wt% Cr and ~8wt% Ni makes it stronger than the steel and more resistant to corrosion. Further addition of molybdenum (Mo) has improved its corrosion resistance, known as type 316 stainless steel. Afterwards, the carbon (C) content has been reduced from 0.08 to 0.03 wt% which improved its corrosion resistance to chloride solution, and named as 316L. Titanium is featured by its light weight. Its density is only 4.5g/cm 3 compared to 7.9g/cm 3 for 316 stainless steel and 8.3g/cm 3 for cast CoCrMo alloys (Brandes and Brook, 1992). Ti and its alloys, i.e. Ti6Al4V are known for their excellent tensile strength and pitting corrosion resistance. Titanium alloyed with Ni, i.e. Nitinol, forms alloys having shape memory effect which makes them suitable in various applications such as dental restoration wiring. In dentistry, precious metals and alloys often used are Au, Ag, Pt and their alloys. They possess good castability, ductility and resistance to corrosion. Included into dental alloys are AuAgCu system, AuAgCu with the addition of Zn and Sn known as dental solder, and AuPtPd system used for porcelain-fused-to-metal for teeth repairs. CoCr alloys have been utilised for many decades in making artificial joints. They are generally known for their excellent wear resistance. Especially the wrought CoNiCrMo alloy has been used for making heavily loaded joints such as ankle implants (Figure 1). Other metals used for implants include tantalum (Ta), amorphous alloys and biodegradable metals. Tantalum which has excell...

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Processing map for the hot working of near-α titanium alloy 685

Cited by 66 publications

References 3 publications

Characterization of the hot deformation behavior of a Ti–22Al–25Nb alloy using processing maps based on the Murty criterion

Characterization of the hot deformation behavior of a Ti–22Al–25Nb alloy using processing maps based on the Murty criterion

Microstructure evolution in the high temperature compression of Ti-5.6Al-4.8Sn-2.0Zr alloy

Metals for Biomedical Applications

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