Development of nanocrystalline Al–Ti alloy powders by reactive ball milling

Moon, Kyoung Il; Lee, Kyung Sub

doi:10.1016/s0925-8388(97)00262-4

Cited by 46 publications

(24 citation statements)

References 21 publications

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“…It was observed that N reacts more readily with titanium than O, in agreement with the N and O pick-ups that were measured in this study. The O pick-up, 0.014 wt.%, is significantly smaller than the smallest O pick-up reported in the previous work 0.45 wt.% [16]. Keeping the final O content below 1000 ppm is critical to the optimization of mechanical properties at room temperature [19].…”

Section: Discussionmentioning

confidence: 99%

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Nanocrystalline TiAl powders synthesized by high-energy ball milling: effects of milling parameters on yield and contamination

Bhattacharya

Bellon

Averback

et al. 2004

Journal of Alloys and Compounds

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Section: Discussionmentioning

confidence: 99%

“…2). Stearic acid, a quite commonly used PCA [14,16], was added to the initial powder load at a level of 2 wt.%. Again, sticking was delayed, in fact even more so than with the addition of cyclohexane.…”

Section: Milling Of Elemental Powders In a Cr-steel Vial With Pca'smentioning

confidence: 99%

Nanocrystalline TiAl powders synthesized by high-energy ball milling: effects of milling parameters on yield and contamination

Bhattacharya

Bellon

Averback

et al. 2004

Journal of Alloys and Compounds

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“…With respect to the aluminum matrix composites, the mechanically driven reduction of metal oxides (solid-solid reactions) such as CuO, [13] ZnO, [14] and TiO 2 [15] has been studied. Because the reduced metal will diffuse into the aluminum lattice and alter the chemical composition of matrix, a gas-solid reaction of aluminum with reactive gases such as H 2 , [16] N 2 , [17] NH 3 , [18] and air [19] to form nanosized dispersions (hydrides, nitrides, and oxides) has been proposed. Besides the industrial significance of the Al6063 alloy (because of its unique mechanical properties), RMA of this alloy to fabricate ultra-fine-grained (UFG) ODS composites via an in situ solid-gas reaction and evaluation of their mechanical properties has seldom been reported.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Oxide-Dispersion Strengthened Al6063 Alloy with Ultra-Fine Grain Structure

Asgharzadeh

Simchi

Kim

2010

Metall Mater Trans A

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The microstructure and mechanical properties of the ultra-fine grained (UFG) Al6063 alloy reinforced with nanometric aluminum oxide nanoparticles (25 nm) were investigated and compared with the coarse-grained (CG) Al6063 alloy (~2 lm). The UFG materials were prepared by mechanical alloying (MA) under high-purity Ar and Ar-5 vol pct O 2 atmospheres followed by hot powder extrusion (HPE). The CG alloy was produced by HPE of the gasatomized Al6063 powder without applying MA. Electron backscatter diffraction under scanning electron microscopy together with transmission electron microscopy studies revealed that the microstructure of the milled powders after HPE consisted of ultra-fine grains (>100 nm) surrounded by nanostructured grains (<100 nm), revealing the formation of a bimodal grain structure. The grain size distribution was in the range of 20 to 850 nm with an average of 360 and 300 nm for Ar and Ar-5 pct O 2 atmospheres, respectively. The amount of oxide particles formed by reactive mechanical alloying under the Ar/O 2 atmosphere was~0.8 vol pct, whereas the particles were almost uniformly distributed throughout the aluminum matrix. The UFG materials exhibited significant improvement in the hardness and yield strength with an absence of strain hardening behavior compared with CG material. The fracture surfaces showed a ductile fracture mode for both CG and UFG Al6063, in which the dimple size was related to the grain structure. A mixture of ductile-brittle fracture mode was observed for the UFG alloy containing 0.8 vol pct Al 2 O 3 particles. The tensile behavior was described based on the formation of nonequilibrium grain boundaries with high internal stress and dislocation-based models.

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“…[7] The hydride-dehydride process also finds applications in storage of hydrogen [8] and synthesis of fine-grained Ti-based alloys. [9][10][11][12][13][14][15] In fine powder form, TiH 2 finds applications in bonding. In the mid-1950s, Hall demonstrated the use of TiH 2 for bonding diamond powder particles to metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Dehydrogenation of nanocrystalline TiH2 and consequent consolidation to form dense Ti

Bhosle

Baburaj

Miranova

et al. 2003

Metall Mater Trans A

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Dehydrogenation of nanocrystalline TiH 2 , produced by pulverization of commercially available powder, has been examined in detail by a combination of thermal analysis, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The dehydrogenation to form Ti occurs as a two-step process involving the formation of an intermediate phase, TiH. In-situ experiments on dehydrogenation inside a transmission electron microscope reveal the possibility of a powder-metallurgy process for consolidation of Ti components by vacuum annealing of nanocrystalline TiH 2 at ϳ0.5T m , where T m is the melting point of Ti. Near-full densification of Ti has been achieved by sintering nanocrystalline TiH 2 under vacuum at ϳ0.5T m .

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Development of nanocrystalline Al–Ti alloy powders by reactive ball milling

Cited by 46 publications

References 21 publications

Nanocrystalline TiAl powders synthesized by high-energy ball milling: effects of milling parameters on yield and contamination

Nanocrystalline TiAl powders synthesized by high-energy ball milling: effects of milling parameters on yield and contamination

Microstructure and Mechanical Properties of Oxide-Dispersion Strengthened Al6063 Alloy with Ultra-Fine Grain Structure

Dehydrogenation of nanocrystalline TiH2 and consequent consolidation to form dense Ti

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