The effect of ternary addition on the formation and the thermal stability of L12 Al3Zr alloy with nanocrystalline structure by mechanical alloying

Moon, Kyoung Il; Chang, Keun Young; Lee, Kyung Sub

doi:10.1016/s0925-8388(00)01101-4

Cited by 37 publications

(12 citation statements)

References 12 publications

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“…The XRD pattern of the ball-milled LiAlH 4 doped with TiCl 3 (50 wt%) also shows diffraction peaks at 2θ of 30. [16]. This means that Al 3 Zr with cubic structure is formed by a mechanochemical reaction of LiAlH 4 and ZrCl 4 .…”

Section: Resultsmentioning

confidence: 99%

Hydrogen release of catalyzed lithium aluminum hydride by a mechanochemical reaction

Kojima

Kawai

Matsumoto

et al. 2008

Journal of Alloys and Compounds

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The effects of various catalysts on the H 2 release characteristics of LiAlH 4 were studied. It was established that the catalytic activity defined by the H 2 desorption capacity by a mechanochemical reaction decreased in the series TiCl 3 > ZrCl 4 > VCl 3 > NiCl 2 > ZnCl 2 . Transition metal trialuminides Al 3 X (X = Ti, Zr, V, Ni) were prepared by the mechanochemical reaction of LiAlH 4 and the metal chlorides, while the reaction of LiAlH 4 and ZnCl 2 yields Zn. The high catalytic activity was attributed to the lower percentage d-character and the electronegativity of those transition metals. The catalytic activity of Ni was also improved with decreasing the Ni particle size. Those catalysts were classified to two groups (1: TiCl 3 , ZrCl 4 ; 2: VCl 3 , NiCl 2 , Ni, nano-Ni) from the viewpoint of the H 2 desorption mechanism.

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Section: Resultsmentioning

confidence: 99%

Hydrogen release of catalyzed lithium aluminum hydride by a mechanochemical reaction

Kojima

Kawai

Matsumoto

et al. 2008

Journal of Alloys and Compounds

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“…According to our previous study on the Al-Zr system, [16] it was found that the homogeneous distribution of two elements is important in forming intermetallic compounds. Also, it is thought that the homogeneous distribution of these two elements was enhanced by the nanocrystallization of the microstructure.…”

Section: A Al-v Binary Systemmentioning

confidence: 98%

“…At present, the diffusivities of V and Al in Al are 1.27 ϫ 10 Ϫ13 cm 2 /s [22] and 2.41 ϫ 10 Ϫ10 cm 2 /s, [23] respectively; there is great difference in the diffusion between Al and V in the Al matrix. Also, since the time required for homogenous distribution of atoms in the Al-V system, 6 hours, was longer than that for Al-Zr system, 3 hour, [16] this could be another evidence that the diffusion of V in Al must be difficult. The amorphous phase was easily formed in this system, because V atoms acted as a slower diffuser in the Al matrix.…”

Section: A Al-v Binary Systemmentioning

confidence: 99%

A study on the microstructural evolution of Al-25 at. pct V-12.5 at. pct M (M = Cu, Ni, Mn) powders by planetary ball milling

Chang¹,

Moon

Lee

2004

Metall Mater Trans A

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The alloying behavior of Al-25 at. pct V-12.5 at. pct M (M ϭ Cu, Ni, Mn) by planetary ball milling of elemental powders hours as been investigated in this study. In Al 3 V binary system, an amorphous phase was produced after 6 hours and the amorphous phase was mechanically crystallized after 20 hours. The large difference in the diffusivities between Al and V atoms in Al matrix results in the formation of the amorphous phase when the homogeneous distribution of all the elements in a powder was achieved at 6 hours. According to thermal analyses, the amorphous phase in the binary Al 3 V was crystallized at 350°C. The addition of ternary elements (Cu, Ni, Mn) increased the activation energy for the crystallization to D0 22 phase by interfering with the diffusion process. Therefore, ternary element addition improved the thermal stability of the amorphous structures. The amorphous phase in the 12.5 at. pct Ni added Al 3 V was crystallized to D0 22 phase at 540°C. The mechanical crystallization of the amorphous phase in the ternary element-added Al-V system either occurred later or was not observed during ball milling up to 100 hours. It is thought that the amorphous intermetallic compacts could be produced more easily in ternary element-added alloys by using an advanced consolidation method.

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“…The role of Zr lies essentially in inhibiting the recrystallization through the precipitation of fine spherical and coherent Al 3 Zr particles. [17][18][19][20][21][22][23][24] Small Zr addition promotes a decomposition of the supersaturated solid solution of Al responsible for the formation of a metastable L1 2 Al 3 Zr phase. Prolonged heat treatment transforms this phase in the equilibrium DO 2 Al 3 Zr phase.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterization of secondary-phase particles in a hot-deformed Al-Cu-Mg-Zr alloy

Cabibbo

Spigarelli

Evangelìsta

2004

Metall Mater Trans A

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Torsion tests, on a 2014 ϩ 0.13Zr alloy, were performed at temperatures in the range 573 to 773 K under strain rates ranging from 10 Ϫ3 to 10 s Ϫ1 . Transmission electron microscopy (TEM) inspection was performed in order to establish the role of the hot deformation on the hardening second-phase particles. The pinning effect of Al 3 Zr particles was also investigated. At the testing temperatures, the Al 3 Zr particles were stable, and no significant statistic changes, in terms of density and mean size, occurred during the tests. Small Al 3 Zr dispersoid particles inhibit recrystallization by pinning the grain and subgrain boundaries during hot deformation. Yet, they are particularly resistant to dislocation shear microstructure mechanism. Grains were elongated and contained a large number of sub-grains a few microns in width.

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The effect of ternary addition on the formation and the thermal stability of L12 Al3Zr alloy with nanocrystalline structure by mechanical alloying

Cited by 37 publications

References 12 publications

Hydrogen release of catalyzed lithium aluminum hydride by a mechanochemical reaction

Hydrogen release of catalyzed lithium aluminum hydride by a mechanochemical reaction

A study on the microstructural evolution of Al-25 at. pct V-12.5 at. pct M (M = Cu, Ni, Mn) powders by planetary ball milling

Microstructural characterization of secondary-phase particles in a hot-deformed Al-Cu-Mg-Zr alloy

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