Powder Metallurgical Processing of Intermetallic Gamma Titanium Aluminides

Gerling, R.; Clemens, Helmut; Schimansky, F.P.

doi:10.1002/adem.200310559

Cited by 198 publications

(187 citation statements)

References 39 publications

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“…38 Mixtures of 80 vol% of Al-12Si and 20 vol% of TNM gas atomized powders (GAP) were prepared by room temperature mechanical milling using a Retsch PM400 planetary ball mill (Haan, Germany) to have a Al-12Si-TNMC with a homogeneous distribution of reinforcement in the matrix. The milling was carried out for 2 h with hardened steel balls and vials with a rotational speed of 100 rotations per minute (rpm) and a ball to powder ratio of 10:1.…”

Section: Methodsmentioning

confidence: 99%

Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

et al. 2015

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Al-12Si (80 vol%)-Ti 52.4 Al 42.2 Nb 4.4 Mo 0.9 B 0.06 (at.%) (TNM) composites were successfully produced by the selective laser melting (SLM). Detailed structural and microstructural analysis shows the formation of the Al 6 MoTi intermetallic phase due to the reaction of the TNM reinforcement with the Al-12Si matrix during SLM. Compression tests reveal that the composites exhibit significantly improved properties (;140 and ;160 MPa higher yield and ultimate compressive strengths, respectively) compared with the Al-12Si matrix. However, the samples break at ;6% total strain under compression, thus showing a reduced plasticity of the composites. Sliding wear tests were carried out for both the Al-12Si matrix and the Al-12Si-TNM composites. The composites perform better under sliding wear conditions and the wear rate increases with increasing loads. At high loads, the wear takes place at three different rates and the wear rate decreases with increasing experiment duration.

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Section: Methodsmentioning

confidence: 99%

Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

et al. 2015

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“…3a). This can be attributed to the extreme high cooling rate in the range of 10 5 K/s [1] which obviously provides not enough time for ordering.…”

Section: Phase Compositionsmentioning

confidence: 99%

“…Gas-atomised spherical powders of Ti-45Al-5Nb-xC (x = 0, 0.5, 0.75 and 1) and Ti-45Al-10Nb (all compositions in at.%) were produced in-house using the plasma melting induction guided gas atomisation (PIGA) technique [1]. The impurity levels in nitrogen and oxygen ranged around 100 mg/g and 400 mg/g, respectively and were analyzed using a conventional LECO melt extraction system.…”

Section: Methodsmentioning

confidence: 99%

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Microstructure of gas atomised γ-TiAl based alloy powders

et al. 2017

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Due to the rapid development of advanced additive manufacturing production routes in recent years, the demand of high-quality alloy powders is significantly increased. We studied gas-atomised spherical powders of several Nb-bearing γ-TiAl based alloys, Ti-45Al-10Nb and Ti-45Al-5Nb-xC in at.% (x = 0, 0.5, 0.75, and 1), which were produced using the plasma melting induction guided gas atomization (PIGA) technique. The phase constitution of different powder fractions was determined by synchrotron high-energy X-ray diffraction at the HEMS beamline DESY (Germany), as well as by SEM, EDX and EBSD measurements. Due to the high cooling rates in the range of 10 5 K/s, the powder particles mainly consist of hexagonal close packed α-Ti(Al) and body centred cubic β-Ti(Al)-phase. As the cooling rate depends on the particle size, considerable amounts of the β-phase were only found in the small powder fractions (< 45 µm). The total β-phase amount was generally higher in the alloy with a higher Nb content, and also the effect of carbon as a α 2 -stabilizer was observed. Dendritic cauliflower-like structures are more pronounced in bigger powder particles due to the slower solidification and thus a higher Nb depletion in the remaining melt.

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“…The lack of room temperature ductility is the main reason why these intermetallics have to be produced by non-conventional and costly production routes. This involves powder metallurgy [2,3], near-net-shape casting from very high temperatures [4], selective laser melting [5,6], electron beam melting [7] and hot forging methods [8].…”

Section: Introductionmentioning

confidence: 99%

Processing of Intermetallic Titanium Aluminide Wires

Marr

Freudenberger

Kauffmann

et al. 2013

Metals

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This study shows the possibility of processing titanium aluminide wires by cold deformation and annealing. An accumulative swaging and bundling technique is used to co-deform Ti and Al. Subsequently, a two step heat treatment is applied to form the desired intermetallics, which strongly depends on the ratio of Ti and Al in the final composite and therefore on the geometry of the starting composite. In a first step, the whole amount of Al is transformed to TiAl 3 by Al diffusion into Ti. This involves the formation of 12% porosity. In a second step, the complete microstructure is transformed into the equilibrium state of γ-TiAl and TiAl 3 . Using this approach, it is possible to obtain various kinds of gradient materials, since there is an intrinsic concentration gradient installed due to the swaging and bundling technique, but the processing of pure γ-TiAl wires is possible as well.

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Powder Metallurgical Processing of Intermetallic Gamma Titanium Aluminides

Cited by 198 publications

References 39 publications

Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

Microstructure of gas atomised γ-TiAl based alloy powders

Processing of Intermetallic Titanium Aluminide Wires

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