Mg-Y-Cu Bulk Metallic Glass Obtained by Mechanical Alloying and Powder Consolidation

Lee, Pee Yew; Hsu, Chih Feng; Wang, C.C.

doi:10.4028/www.scientific.net/MSF.534-536.205

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Mg-Y-Cu Bulk Metallic Glass Obtained by Mechanical Alloying and Powder Consolidation

Abstract:

Mg55Y15Cu30 metallic glass powders were prepared by the mechanical alloying of pure Mg, Y, and Cu after 10 h of milling. The thermal stability of these Mg55Y15Cu30 amorphous powders was investigated using the differential scanning calorimeter (DSC). Tg ,Tx , and Δ Tx are 442 K, 478 K, and 36 K, respectively. The as-milled Mg55Y15Cu30 powders were then consolidated by vacuum hot pressing into disk compacts with a diameter and thickness of 10 mm and 1 mm, respectively. This yielded bulk Mg55Y15Cu30 metallic glass with nanocrystalline precipitates homogeneously embedded in a highly dense glassy matrix. The pressure applied during consolidation can enhance thermal stability and prolong the existence of amorphous phase within Mg55Y15Cu30 powders.

Info:

Periodical:

Materials Science Forum (Volumes 534-536)

Main Theme:

Progress in Powder Metallurgy

Edited by:

Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim

Pages:

205-208

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.534-536.205

Citation:

P. Y. Lee et al., "Mg-Y-Cu Bulk Metallic Glass Obtained by Mechanical Alloying and Powder Consolidation", Materials Science Forum, Vols. 534-536, pp. 205-208, 2007

Online since:

January 2007

Authors:

Pee Yew Lee, Chih Feng Hsu, C.C. Wang

Keywords:

Bulk Metallic Glass (BMG), Mechanical Alloying (MA), Supercooled Liquid Region, Vacuum Hot Pressing

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References

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DOI: https://doi.org/10.1063/1.372237

Paper TitlePages

Stability and Formation Ability of Fe-Based Bulk Metallic Glasses under High Pressure

Authors: Ming Xiang Pan, Wei Hua Wang, Yong Hu, De Qian Zhao, Yan Hui Zhao, Tatsuya Okada, W. Utsumi

Fabrication of Rod type Cu₅₄Ni₆Zr₂₂Ti₁₈ Bulk Amorphous Alloy by Warm Extrusion Process

Authors: Sung Chul Lim, Kyung Hoon Kim, Heung Bok Lee, Hyo Soo Lee, Hyouk Chon Kwon

Abstract: In this study, rod type Cu54Ni6Zr22Ti18 bulk amorphous alloy fabricated by warm extrusion of amorphous powders was investigated. To get bulk type amorphous alloy, the Cu54Ni6Zr22Ti18 amorphous powders which has a particle size below 63( and wide supercooled liquid region of 53K were prepared by a high-pressure gas atomization method. The powders were filled in a Cu can with an inner dimension 20×2×50mm in air, evacuated, sealed and then precompacted in the press. Before extrusion, the billet was heated with heating rate of 50K/min and the holding time was about 5min. The extrusion temperature was 723K and the extrusion ratio was increased from 2 to 5. By warm extrusion of amorphous powders, a fully amorphous Cu54Ni6Zr22Ti18 bulk type alloys were successfully synthesized. The conditions for extrusion were decided based on the time-temperature-transformation curve and DSC analysis. Phase analysis was performed by XRD. The result of the phase analysis indicated that Cu54Ni6Zr22Ti18 bulk rod type samples having fully amorphous phase could be obtained until extrusion ratio of 4 at extrusion temperature of 723K, but partial crystalline phase would be observed in the bulk rod type alloy fabricated at extrusion ratio of 5.

281

Mechanical Alloying for Preparation of Ti₅₀Fe₄₅Sn₅ Amorphous Alloys Powder

Authors: Ge Wang, Chun Zhang, Yu Ying Zhu, Zhi Gang Chao, Qiang Li

Abstract: Ti50Fe45Sn5 amorphous alloys powder was prepared by mechanical alloying (MA) in a high-energy planetary ball mill. The non-crystallization degree was tested by X-ray diffraction (XRD). It was shown from the XRD results that a higher ball to powder weight ratio (BPR) is advantageous in preparing amorphous alloys powder. The microstructure and shape of the powder was observed by scanning electron microscope (SEM). It was shown from the SEM results that the as-milled amorphous alloys powder is flake shape and assembles together to be agglomeration structure, which is a typical morphology of amorphous powders prepared by MA. Thermodynamic properties and crystallization kinetics behavior of the as-milled amorphous alloys powder were measured by differential scanning calorimeter (DSC). The supercooled liquid region △Tx is broad (up to 119K) and the reduction glass transforming temperature Trg (0.78) is great, which shows that the as-milled amorphous alloys powder has a strong glass-forming ability and the thermal stability of the powder is excellent.

104

Effect of Boron on the Amorphization of Fe-Si Alloys by Mechanical Alloying

Authors: Petr Urban, Francisco Gomez Cuevas, Juan M. Montes, Jesus Cintas

Abstract: The amorphization process by mechanical alloying in the Fe-Si alloy system has been studied. High energy ball milling has been applied for alloys synthesis. X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to monitor the structural and phase transformations through the different stages of milling. The addition of amorphous boron in the milling process and the increase of the milling time were used to improve the formation of the amorphous phase. Heating the samples resulted in the crystallization of the synthesized amorphous alloys and the appearance of equilibrium intermetallic compounds.

739

The Influence of High-Energy Ball Milling and Sintering Process on the Microstructure and Mechanical Properties of Al-Ni-Y-Co-La Alloy

Authors: Y.B. Yuan, Rui Xiao Zheng, Su Jing Ge, Han Yang, Chao Li Ma

Abstract: Al₈₆Ni₇Y_4.5Co₁La_1.5 (at.%) alloy powder was produced by argon gas atomization process. After high-energy ball milling, the powder was consolidated and extruded by using vacuum hot press sintering under different process conditions, sintering temperature, extrusion pressure, sintering time, etc.. The microstructure and morphology of the powder and consolidated bulk alloy were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phase transformation of the powder was investigated by differential scanning calorimetry (DSC). Mechanical properties of the consolidated bulk alloy were examined. The results showed that as the milling time increase, the volume fraction of amorphous materials and the hardness and yield strength of the bulk alloy were obvious improved.

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