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bear2002_0

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[资源] 镁基大块非晶14篇SCI文章

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http://www.namipan.com/d/Mg%e5%9 ... ffa80d0ebf4feeb6c00
[net]http://www.namipan.com/d/Mg%e5%9f%ba%e9%9d%9e%e6%99%b614%e7%af%87%e6%96%87%e7%ab%a0.rar/4eafb1dfa49d10abb06b1ec8cf056ffa80d0ebf4feeb6c00[/net

续传了3篇，地址如下：http://www.namipan.com/d/%e9%95% ... 6b050abd2f5ef931300

1.Scripta Materialia

Title: Bulk metallic glass formation in the Mg–Cu–Zn–Y system

H. Men, Z.Q. Hu, J. Xu
Shenyang National Laboratory for Materials Sciences, Institute of Metal Research, CAS, 72 Wenhua Road, Shenyang 110016, China

Abstract
The element Cu in the bulk glass-forming alloy Mg65Cu25Y10 was substituted with the element Zn to form a Mg65Cu20Zn5Y10 alloy, which caused a significant improvement of the glass-forming ability of Mg65Cu25Y10 alloy. For the Mg65Cu20Zn5Y10 alloy, fully glassy rod with a 6-mm diameter can be obtained by copper mold casting.

2.Materials Science and Engineering R

Title: Bulk metallic glasses

W.H. Wang, C. Dong, C.H. Shek,
Institute of Physics, Chinese Academy of Science, Beijing, PR China
State Key Laboratory of Materials Modification and Department of Materials Engineering,
Dalian University of Technology, Dalian 116024, PR China
Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong, PR China

Abstract
Amorphous alloys were first developed over 40 years ago and found applications as magnetic core or reinforcement added to other materials. The scope of applications is limited due to the small thickness in the region of only tens of microns. The research effort in the past two decades, mainly pioneered by a Japanese- and a US-group of scientists, has substantially relaxed this size constrain. Some bulk metallic glasses can have tensile strength up to 3000 MPa with good corrosion resistance, reasonable toughness, low internal friction and good processability. Bulk metallic glasses are now being used in consumer electronic industries, sporting goods industries, etc. In this paper, the authors reviewed the recent development of new alloy systems of bulk metallic glasses.The properties and processing technologies relevant to the industrial applications of these alloys are also discussed here. The behaviors of bulk metallic glasses under extreme conditions such as high pressure and low temperature are especially addressed in this review. In order that the scope of applications can be broadened, the understanding of the glass-forming criteria is important for the design of new alloy systems and also the processing techniques.

3.Intermetallics

Title: Calculation of metastable free-energy diagrams and glass formation in the Mg–Cu–Y alloy and its boundary binaries using the Miedema model

R. Hojvat de Tendler, M.R. Soriano, M.E. Pepe, J.A. Kovacs, E.E. Vicente, J.A. Alonso

Abstract
We have extended Miedema’s model to the modelling of free-energy diagrams in ternary alloys and applied the extended model to obtain a thermodynamic characterization of the glass formation range in Mg–Cu–Y. A structural term has been added in the calculation of the free energy of formation of solid solutions. By assuming that amorphization competes with formation of the hcp and fcc solid solutions, we have evaluated the region of compositions in which the system can be amorphized by quenching or casting of the liquid alloy. Equations of analytical geometry are proposed to search for regions of coexistence of amorphous and solid solutions, which could not be found for this ternary alloy. Heats of glass crystallisation have been calculated. The results of our model are in reasonable agreement with experimental data.

4. Intermetallics

Title: Effects of partial replacement of Cu and Y by B in Mg–Cu–Y amorphous alloys

Y.T. Cheng , T.H. Hung , J.C. Huang , J.S.C. Jang , Chi Y.A. Tsao , P.Y. Lee

Abstract
The effects of replacing Cu or Y by a small-sized B in the Mg65Cu25Y10 based alloy are examined. It is found that the replacement of Y by B consistently leads to apparent degradation in GFA; the large sized Y seems to be irreplaceable. In contrast, the replacement of the small sized Cu by the even smaller B to a small amount (1–5%) appears to be beneficial in terms of wider DT, higher GFA, thermal stability, and hardness, as well as lower density. In this study, the optimum quaternary alloy composition is identified to be Mg65Cu22Y10B3.

5.Materials Science and Engineering A

Title: Elevated temperature flow behaviour of a Mg-based bulk metallic glass

B. Gun, K.J. Laws, M. Ferry

Abstract
The flowbehaviour in the supercooled liquid region of a low-pressure die-castMg65Cu25Y10 (at.%) bulk metallic glass over a range of temperatures (150–170 ◦C) and strain rates (10−3 to 10−1 s−1) was investigated by tensile testing. In most cases, the maximum elongation obtained was 1300% without failure due to the limitations of the maximum traveling distance of the tensile testing machine. The flow behaviour was analysed in terms of the free volume model with the results used in conjunction with experimental data to construct deformation maps in terms of peak stress, strain rate and temperature for identifying the homogeneous and inhomogeneous deformation zones under various testing conditions.

6.Materials Science and Engineering A

Title: Fabrication of Mg–Y–Cu bulk metallic glass by mechanical alloying and hot consolidation

P.Y. Lee, W.C. Liu , C.K. Lin , J.C. Huang

Abstract
Mg45Y15Cu40 (numbers indicate at.%) 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 Mg45Y15Cu40 amorphous powders was investigated using the differential scanning calorimeter (DSC). Tg, Tx, and Tx are 456, 491, and 35 K, respectively. The as-milled Mg45Y15Cu40 powders were then consolidated by vacuum hot pressing into disk compacts with a diameter and thickness of 10 and 1 mm, respectively. This yielded bulk Mg45Y15Cu40 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 Mg45Y15Cu40 powders.

7.Journal of Alloys and Compounds

Title: Formation of Mg–Cu–Zn–Y bulk metallic glasses with compressive strength over gigapascal

Z.G. Li, X. Hui, C.M. Zhang, G.L. Chen

Abstract
The Mg55+xCu30−xZn5Y10 bulk metallic glasses (BMGs) with diameter of at least 3mm were successfully fabricated in compositional range at x = 3–15 by conventional Cu-mold casting method. This kind of BMG alloys have supercooled liquid region (SLR) from 40 to 65 K, γ-value from 0.390 to 0.417, and the reduced glass transformation temperature from 0.543 to 0.576. By increasing the Zn content to 7%, the compressive strength of Mg-based BMG alloy reaches about 1.1 GPa. Vein pattern morphology has been observed in fractured surface of the Mg58Cu25Zn7Y10 alloy. The thermal, mechanical, and acoustic measurements indicate that Mg–Zn–Cu–Y BMGs are intrinsically brittle and are of good GFA. It is suggested that the correlation of elastic constants and mechanical properties of alloys could guide the Mg-based BMGs design.

8.Journal of Non-Crystalline Solids

Title: Gibbs free energy difference in metallic glass forming liquids

Xiulin Ji, Ye Pan

Abstract
Expressions of Gibbs free energy difference (DG) based on linear variation of heat capacity difference of liquid and solid (DClsp ) with temperature in the super-cooled metallic liquid is reviewed. Attractively, hyperbolic variation of DCls p with temperature is suggested from the experimental data. According to this hyperbolic relationship, DG expression of Thompson and Spaepen could be also derived and a new DG expression is proposed. Calculations with the present expression have shown that DG values obtained from six glass forming alloys (La50Al30Ni20, Pd40Ni40P20, Zr52.5Cu17.9Ni14.6Al10Ti5, Zr41.2Ti13.8Cu12.5Ni10Be22.5, Cu47Ti34Zr11Ni8 and Mg65Cu25Y10) are consistent with experimental data. As compared with other DG expressions, deviations of the values calculated by the present expression from experimental data show the best stable at different reduced glass transition temperature (Trg = Tg/Tm) of amorphous alloys.

9.Intermetallics

Title:Mg–Y–Cu bulk metallic glass prepared by mechanical alloying and vacuum hot-pressing

P.Y. Lee , M.C. Kao , C.K. Lin , J.C. Huang

Abstract
We have studied the amorphization behavior of Mg85KxY15Cux (xZ20–40) alloy powders synthesized by mechanical alloying technique. The as-milled powders were mainly amorphous after 10 h of milling. The thermal stability of these Mg85KxY15Cux glassy powders was investigated by differential scanning calorimeter (DSC). The ranges of Tg, Tx and DTx are around 430–459, 467–497, and 30–46 K, respectively. The Mg49Y15Cu36 glassy powders exhibit the largest supercooled region of 46 K. The amorphization behavior of Mg61Y15Cu24 was examined in details. Amorphous phases gradually became dominant after 7.5 h of milling and fully amorphous powders formed at the end of milling. The thermal stability of Mg61Y15Cu24 glassy powders was similar to that of melt-spun Mg60Y15Cu25 amorphous alloys. Mg61Y15Cu24 bulk metallic glass with homogeneously embedded nanocrystalline precipitates was successfully prepared by vacuum hot pressing. It was found that the applied pressure during consolidation could enhance the thermal stability and prolong the existence of amorphous phase inside Mg61Y15Cu24 powders.

10. Scripta Materialia

Title:Microstructure and mechanical properties of a thixocast Mg–Cu–Y alloy

Jeong-Min Kim , Keesam Shin , Ki-Tae Kim , Woon-Jae Jung

Abstract
The possibility of producing high strength Mg–Cu–Y alloys by the thixocasting process was investigated. A microstructure, consisting of globular primary Mg particles surrounded by quenched liquid (partly amorphized), could be obtained and gave significantly high tensile strength compared to conventional Mg castings.

11.Scripta Materialia

Title: Prediction of composition dependency of glass forming ability of Mg–Cu–Y alloys by thermodynamic approach

Deok Kim, Byeong-Joo Lee, Nack J. Kim

Abstract
A simple thermodynamic calculation scheme has been proposed to predict the composition dependency of glass forming ability (GFA) in the Mg–Cu–Y ternary alloys. Driving forces of formation for crystalline phases under undercooled liquid states are calculated to define the composition with a local minimum of the driving forces as the one with the highest GFA. The calculated results are in good agreement with the experimental results.

12: Physics Letters A

Title: Short-to-medium-range order in Mg65Cu25Y10 metallic glass

X. Hui , R. Gao , G.L. Chen, S.L. Shang , Y. Wang, Z.K. Liu

Abstract
The atomic configurations of liquid and glassy Mg65Cu25Y10 alloy have been simulated in the temperature range of 300 K to 2000 K via ab initio molecular dynamics. The variations of pair correlation function (PCF), structure factor (SF), coordination number (CN) and bond pairs with the temperature for this alloy are characterized. It has been shown that the atoms are near densely packed and icosahedral type of short-range order (SRO) is predominant in the glass state. Icosahedral medium range order (MRO) can be formed by vertex or intercross connection of icosahedral SROs. In this work, an icosahedral MRO which is composed of 55 atoms has been found. It has been also clarified that Mg and Cu occupy the centre or vertex, and Y atoms only occupy the vertex of the icosahedron in this glassy alloy. It is believed that these findings have implication for understanding the glass forming mechanism of magnesium based metallic glasses.

13: Journal of Non-Crystalline Solids

Title: Static and dynamic crystallization in Mg–Cu–Y bulk metallic glass

B. Gun, K.J. Laws, M. Ferry

Abstract
The static and dynamic crystallization behavior of Mg65Cu25Y10 bulk metallic glass was investigated by X-ray diffraction, differential scanning calorimetry and transmission electron microscopy. It was found that the kinetics of both anisothermal and isothermal crystallization were adequately represented by the Kissinger and KJMA relations, respectively. The apparent activation energy for crystallization was calculated to be 139 kJ/mol; this value is close to the self diffusion of Mg in both a crystalline and non-crystalline matrix. The Avrami exponent was found to vary from 2.2 to 2.5 with increasing annealing temperature which implies that, at high annealing temperatures, nucleation occurs at a constant rate accompanied by diffusion-controlled growth of spherical grains. Tensile straining in the supercooled liquid region indicated that crystallization is slightly accelerated compared with static crystallization; this phenomenon was found to adversely affect the ductility of the alloy.

有一篇重复了，不好意思。

[ Last edited by hslining on 2009-9-21 at 23:34 ]

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