Study on compression deformation, damage and fracture behavior of TiAl alloys

Cao, Rui; Li, L.; Chen, J.H.; Zhang, J.

doi:10.1016/j.msea.2008.12.012

Cited by 18 publications

(3 citation statements)

References 11 publications

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“…However, the crack initiated only from both top and bottom surface, and very short crack propagated in the middle for the samples sintered at 1350°C as seen in Figure.2(b). This result is also in agreement with a study reported by Cao et al[14] and Cao et al[15]. They found that in compression test, the fracture starts from the top or / and the bottom surfaces by the shear cracking with an angle around 45° inclined to the compression axis.…”

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confidence: 93%

The Effect of Sintering on the Properties of Powder Metallurgy (PM) F-75 Alloy

Daud

Jamaludin

2013

AMR

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F-75 (Co-Cr-Mo) alloy are widely used in the production of medical implants because of their excellent strength properties, hardness and also one of the biocompatible materials that very suitable in human body environment. In this research, the effect of sintering in terms of sintering temperature and sintering time has been studied by focusing on the microstructure, physical and mechanical properties of F-75 alloy. The samples were prepared by blending the starting material at 160 rpm for 30 minutes, uniaxially pressing at 500 MPa and sintering in an argon atmosphere at two sintering temperatures (1300°C and 1350°C) for four sintering times (60, 90, 120 and 150 minutes). The results show that the grains and bulk density increased with the increasing of sintering temperature and sintering times. However, opposite results were obtained for apparent porosity, hardness and compressive strength

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confidence: 93%

The Effect of Sintering on the Properties of Powder Metallurgy (PM) F-75 Alloy

Daud

Jamaludin

2013

AMR

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“…In the following, the microstructures are compared on the basis of the three parameters that have already been shown to have a positive effect on the forming behavior of TiAl [18,19]. These parameters are high β/β 0 phase fractions, high cellular phase fractions and low proportions of lamellar colonies.…”

Section: Heat Treatment Studymentioning

confidence: 99%

Development of a heat treatment strategy for the γ-TiAl based alloy TNM-B1 to increase the hot workability

et al. 2019

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Currently, TiAl turbine blades produced by isothermal forging are commercially used in aircraft jet engines. The limited workability of the HIPed microstructure causes long processing times because of low ram speeds and excessive wear on the costly molybdenum tools due to high forging stresses and temperatures. By introducing a multi-step heat treatment into the industrial forging chain, the formability of the material can be improved, leading to lowered production costs. In this work, the parameters of interest for improved formability are increased β/β 0 phase fractions, increased cellular phase fractions and reduced proportions of lamellar colonies. Several two-step heat treatments were investigated. The parameters of interest were then measured and compared. Subsequently, compression tests were carried out for the most promising heat treatments. It could be shown that a flow stress reduction of around 10% can be achieved by one of these heat treatments (1300 °C/1 h/AC + 1100 °C/5 h/AC). For this heat treatment, reproducibility was also checked using differential scanning calorimetry.

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“…According Cao et. al [17] the fracture modes of TiAl alloys in compression can take both shear and cleavage fractures depending on the crack initiation and propagation mode. The fracture of the TiAl alloy specimens in compression may occur in the same way, as suggested by the fracture surface shown in Figs.…”

Section: Room Temperature Mechanical Behaviourmentioning

confidence: 99%

The mechanical behaviour of an ultrafine grained Ti–47Al–2Cr (at%) alloy in tension and compression and at different temperatures

Nadakuduru

Zhang

Cao

et al. 2011

Materials Science and Engineering: A

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A c c e p t e d M a n u s c r i p t Research Highlights Powder metallurgy process has been used to produce UFG Ti-47Al-2Cr (at%) alloy. At room temperature, the UFG alloy was found to be ductile in compression (~ 4%). At elevated temperatures the alloy showed high tensile and compressive ductility. The yield strength at 900 o C is 55MPa in tension and ~ 33MPa in compression. *Research HighlightsPage 2 of 17 A c c e p t e d M a n u s c r i p t AbstractA bulk ultrafine grained (UFG) Ti-47Al-2Cr (at%) alloy has been produced using a powder metallurgy process that combines high energy mechanical milling (HEMM) of a mixture of Ti, Al and Cr powders to produce a Ti/Al/Cr composite powder and hot isostatic pressing (HIP) of the composite powder compact. The purpose of the present study is to determine the mechanical behaviour of the alloy in tension and compression at room temperature (RT) and elevated temperatures, and also to compare the compression behaviour of the material with its tensile behaviour. It has been found that due to the residual pores, lack of full level interparticle bonding and high oxygen content (0.87wt%) in the consolidated samples, the UFG TiAl based alloy has a very low room temperature tensile fracture strength of ~100MPa and shows no tensile ductility. However these microstructural defects and high oxygen content have much less significant effect on the room temperature compressive mechanical properties, and the alloy shows a high compressive yield strength of ~ 1410 MPa, and some ductility (plastic strain to fracture ~ 4%). At elevated temperatures of 800 o C and above, the alloy shows high tensile and compressive ductility as demonstrated by 75% tensile elongation to fracture and no cracking in upset forging with a height reduction of 50% at 900 o C. The yield strength of the alloy at 900 o C is 55MPa in tension and ~ 33MPa in compression, both of which are lower than those of coarse grained TiAl based alloys with similar compositions at 900 o C. This is due to a higher creep rate of the UFG alloy caused by the small grains. The good formability of the UFG TiAl based alloy as reflected by the lower critical temperature above which the alloy becomes highly formable indicates that the material can be used as a suitable precursor for secondary thermomechanical processing and super-plastic forming.

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Study on compression deformation, damage and fracture behavior of TiAl alloys

Cited by 18 publications

References 11 publications

The Effect of Sintering on the Properties of Powder Metallurgy (PM) F-75 Alloy

The Effect of Sintering on the Properties of Powder Metallurgy (PM) F-75 Alloy

Development of a heat treatment strategy for the γ-TiAl based alloy TNM-B1 to increase the hot workability

The mechanical behaviour of an ultrafine grained Ti–47Al–2Cr (at%) alloy in tension and compression and at different temperatures

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