New Amorphous Mg-Ce-Ni Alloys with High Strength and Good Ductility

Inoue, Akihisa; Ohtera, Katsumasa; Kita, Kazuhiko; Masumoto, T.

doi:10.1143/jjap.27.l2248

Cited by 533 publications

(214 citation statements)

References 11 publications

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“…The high glass-forming ability enables us to prepare bulk glassy alloys by copper mold casting or quenching the melt in a quartz tube into stirred water. As a result, a number of bulk glassy alloys have been successfully prepared in multicomponent systems such as Mg-, 2) Zr-, 3) Ti-, 4) Fe-, 5) Pd-, 6) Ni-, 7) Co- 8) and based alloys. Summarizing the features of the above-mentioned multicomponent systems, the following three empirical rules have been proposed, 10) i.e., (1) multi-component systems consisting of more than three kinds of elements, (2) significant difference in atomic size ratios above 12% among the main constituent elements, and (3) suitable negative heats of mixing among their main elements.…”

Section: Introductionmentioning

confidence: 99%

Bulk Glass Formation of Ti-Zr-Hf-Cu-M (M=Fe, Co, Ni) Alloys

Wang²,

Zhang

et al. 2002

Mater. Trans.

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196

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mold casting. The T x and T g of the glassy rod were 711 K and 658 K and T g /T m was 0.57. The bulk glassy alloy can be characterized by equal concentration of constituent elements without distinct host component. It is confirmed that more multicomponent glassy systems have a better glass-forming ability as compared with simpler alloy systems. The glassy alloy rod also exhibits good mechanical properties which are similar to those for ordinary glassy alloys. The finding of this alloy system may provide a new synthesis method of bulk glassy alloys.

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Section: Introductionmentioning

confidence: 99%

Bulk Glass Formation of Ti-Zr-Hf-Cu-M (M=Fe, Co, Ni) Alloys

Wang²,

Zhang

et al. 2002

Mater. Trans.

Self Cite

196

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“…In some exceptional cases, heating amorphous alloys produces undercooled melt. [17][18][19][20][21][22][23][24] In the case of the Al 2 O 3 -Y 2 O 3 system, it is emphasized that the undercooled melt is produced by heating the metastable eutectic structure consisting of crystal phases. 16) Uniform Al 2 O 3 -YAG eutectic structure with sub-micron order in spacing was formed when solidification in the equilibrium path was accompanied by the melting of the metastable eutectic structure.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that a large supercooled liquid region is found in multicomponent systems for metallic alloy systems. [17][18][19][20][21][22][23][24] 28) This paper focuses on the eutectic selection and the undercooled melt formation in the Al 2 O 3 -Y 2 O 3 -ZrO 2 pseudo-ternary system. Firstly, criterion for selection of the eutectic systems is examined in terms of maximum melt temperature by using an optical DTA apparatus.…”

Section: Introductionmentioning

confidence: 99%

Undercooled Melt Formation by Melting of Metastable Eutectic Structure in Al2O3-Y2O3-ZrO2 System

et al. 2002

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This paper presents a selection of the eutectic systems in the Al 2 O 3 -Y 2 O 3 -ZrO 2 pseudo-ternary system and the production of the undercooled melt due to melting of the metastable eutectic structure at the metastable eutectic temperature. In the pseudo-ternary system, there are two eutectic systems; one is the Al 2 O 3 -YAG(Y 3 Al 5 O 12 )-ZrO 2 equilibrium system and the other is the Al 2 O 3 -YAP(YAlO 3 )-ZrO 2 metastable system. The eutectic system was selected by maximum melt temperature before solidification. YAG nucleation was inhibited in the melt when heated above 2250 K and consequently the metastable eutectic solidification path was selected. The selection controlled by the melt temperature before solidification was similar to that of the Al 2 O 3 -Y 2 O 3 system. Furthermore, the undercooled melt formation was found when the Al 2 O 3 -YAP-ZrO 2 metastable eutectic structure was heated up to temperatures above the metastable eutectic temperature. The addition of ZrO 2 to the Al 2 O 3 -Y 2 O 3 system inhibited the YAG nucleation remarkably and enhanced the undercooled melt formation in comparison with the Al 2 O 3 -Y 2 O 3 pseudo-binary system. Ease of the undercooled melt formation in the pseudo-ternary system will be beneficial for the melt shaping processes.

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“…However, during the last decade, some exceptions have been reported because of the discoveries of stabilized supercooled liquid alloys without crystallization even during cooling at slow rates below 100 K/s [1,2]. As a result, bulk amorphous alloys have been prepared in a number of alloy systems such as Mg- [3], Ln(lanthanide)- [4], Zr- [5,6], Fe- [7], Pd-Cu- [8], Ti- [9], Ni- [10] and Co- [11] bases and have gained some applications due to their unique mechanical properties, chemical properties and good workability resulting from the amorphous structure. It has subsequently been found that the use of the stabilized liquid also gives rise to bulk amorphous alloys containing nanocrystalline [12] and nanoquasicrystalline [13] particles with good mechanical properties in the Zr-based alloy systems.…”

Section: Introductionmentioning

confidence: 99%

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

Inoue

Fan

Saida

et al. 2000

Science and Technology of Advanced Materials

115

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It was recently found that the addition of special elements leading to the deviation from the three empirical rules for the achievement of high glass-forming ability causes new mixed structures consisting of the amorphous phase containing nanoscale compound or quasicrystal particles in Zr-Al-Ni-Cu-M (M Ag, Pd, Au, Pt or Nb) bulk alloys prepared by the copper mold casting and squeeze casting methods. In addition, the mechanical strength and ductility of the nonequilibrium phase bulk alloys are significantly improved by the formation of the nanostructures as compared with the corresponding amorphous single phase alloys. The composition ranges, formation factors, preparation processes, unique microstructures and improved mechanical properties of the nanocrystalline and nanoquasicrystalline Zr-based bulk alloys are reviewed on the basis of our recent results reported over the last two years. The success of synthesizing the novel nonequilibrium, highstrength bulk alloys with good mechanical properties is significant for the future progress of basic science and engineering. ᭧

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New Amorphous Mg-Ce-Ni Alloys with High Strength and Good Ductility

Cited by 533 publications

References 11 publications

Bulk Glass Formation of Ti-Zr-Hf-Cu-M (M=Fe, Co, Ni) Alloys

Bulk Glass Formation of Ti-Zr-Hf-Cu-M (M=Fe, Co, Ni) Alloys

Undercooled Melt Formation by Melting of Metastable Eutectic Structure in Al<SUB>2</SUB>O<SUB>3</SUB>-Y<SUB>2</SUB>O<SUB>3</SUB>-ZrO<SUB>2</SUB> System

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

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