Enhanced glass forming ability and mechanical properties of new Cu-based bulk metallic glasses

Kim, Y.C.; Lee, Jae Chul; Cha, Pil-Ryung; Ahn, Jae Pyoung; Fleury, Éric

doi:10.1016/j.msea.2006.07.141

Cited by 68 publications

(41 citation statements)

References 17 publications

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“…Despite alloys corresponding to the CuZr system with Cu/Zr ratio of 1.5, such as Cu 50 Zr 43 Al 7 (at. %), exhibit rather high GFA [17], it is also true that their GFA is very composition sensitive, i.e., alloys with similar composition exhibit very different GFA [18]. This can result in alloys of different degrees of amorphicity even for similar composition and therefore could have large effect on the mechanical behaviour [19], which is in agreement with our results obtained using nanoindentation and scratch tests.…”

Section: Accepted Manuscriptsupporting

confidence: 90%

Antimicrobial and wear performance of Cu-Zr-Al metallic glass composites

et al. 2017

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The antimicrobial and wear behaviour of metallic glass composites corresponding to the Cu 50+x (Zr 44 Al 6 ) 50-x system with x=(0, 3 and 6) has been studied. The three compositions consist of crystalline phases embedded in an amorphous matrix and they exhibit crystallinity increase with increasing Cu content, i.e., decrease of the glass-forming ability. The wear resistance also increases with the addition of Cu as indirectly assessed from H/E r and H

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Section: Accepted Manuscriptsupporting

confidence: 90%

Antimicrobial and wear performance of Cu-Zr-Al metallic glass composites

et al. 2017

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“…We have selected 25 different Cu-based bulk amorphous alloys, where the maximum diameter has been examined and the same heating rate (40 K/min) has been used in the measurements of thermal parameters [6,9,10]. The relationship between the γ value and D max is shown in Figure 3.…”

Section: Lu and Liu Criterion Based On The Measured Thermalmentioning

confidence: 99%

“…The copper-based bulk metallic glasses (BMGs) occupy a special place in the family of BMGs owing to their relatively low priced. The serial industrial applications were blocked in the recent past by the small thickness of formed metallic glasses; the maximum size of Cu-based metallic glasses is still restricted to a few mm (12 mm has been reported [1]), at the time being. In order to develop new bulk metallic glasses with larger size there is imperative need for the quantification of GFA.…”

Section: Introductionmentioning

confidence: 99%

Survey of BGFA Criteria for the Cu-Based Bulk Amorphous Alloys

Janovszky

Tomolya

Svéda

et al. 2011

Journal of Metallurgy

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To verify the effect of composition on the bulk glass forming ability (BGFA) of Cu-based alloys, properties have been collected from the literature (∼100 papers, more than 200 alloys). Surveying the BGFA criteria published so far, it has been found that the atomic mismatch condition of Egami-Waseda is fulfilled for all the Cu-based BGFAs, the λ value being above 0,3. The Zhang Bangwei criterion could be applied for the binary Cu-based alloys. The Miracle and Senkov criteria do not necessarily apply for Cu based bulk amorphous alloys. The critical thickness versus γ = T x /(T g + T l ) plot of Lu and Liu extrapolates to γ = 0.36, somewhat higher than the 0.33 value found in other BGFA alloys. The Park and Kim parameter correlates rather poorly with the critical thickness for Cu based alloys. The Cheney and Vecchino parameter is a good indicator to find the best glass former if it is possible to calculate the exact liquids projection. In 2009 Xiu-lin and Pan defined a new parameter which correlates a bit better with the critical thickness. Based on this survey it is still very difficult to find one parameter in order to characterize the real GFA without an unrealized mechanism of crystallization.

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“…Therefore, a positive heat of mixing with the major constituent elements of the base alloys has been reported to increase the room temperature plasticity of BMGs [8][9][10][11][12][13][14]. For example, Cu 46 Zr 45 Al 7 Y 2 (Zr-Y: +35 kJ/mol), Cu 45 Zr 47 Al 7 Fe 1 (Cu-Fe: +13 kJ/mol), and Cu 43 Zr 43 Al 7 Ag 7 (Cu-Ag: +5 kJ/mol) exhibited the enhanced plastic strain of 5.21%, 9.48%, and 6.3%, respectively [15][16][17]. Much research has shown that the adding of Ag can effectively enhance the GFA of the Cu-Zr-, Zr-Cu-, Zr-Cu-Al-based BMGs [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ag Addition on the Enhancement of the Thermal and Mechanical Properties of CuZrAl Bulk Metallic Glasses

Chung

Hsieh

2016

Metals

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Abstract:In this study, the thermal and mechanical properties of Cu 50−x Zr 43 Al 7 Ag x (x = 0, 3, 4, 5, 6) bulk metallic glasses (BMGs) are investigated by using an X-ray diffractometer (XRD), a differential scanning calorimeter (DSC), differential thermal analysis (DTA), a Vickers hardness tester, a material test system (MTS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Cu 50−x Zr 43 Al 7 Ag x (x = 0, 3, 4, 5, 6) BMGs were made by arc-melting and an injection casting process. The results revealed that the glass transition temperature (T g ) and the crystallization temperature (T x ) of CuZrAl alloy decreased with the Ag addition. Hence, the supercooled liquid region and γ of Cu 45 Zr 43 Al 7 Ag 5 alloy increased to 76 K and 0.42, respectively. The thermal stability and glass forming ability of CuZrAlAg BMG alloys were enhanced by the microalloyed Ag content. The room temperature compressive fracture strength and strain measured of Cu 47 Zr 43 Al 7 Ag 3 were about 2200 MPa and 2.1%, respectively. The distribution of vein patterns and the formation of nanocrystalline phases on the fracture surface of Cu 47 Zr 43 Al 7 Ag 3 alloy can be observed by SEM and TEM to be significant, indicating a typical ductile fracture behavior and an improved plasticity of alloys with the addition of microalloyed Ag from 0 to 6 atom %.

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Enhanced glass forming ability and mechanical properties of new Cu-based bulk metallic glasses

Cited by 68 publications

References 17 publications

Antimicrobial and wear performance of Cu-Zr-Al metallic glass composites

Antimicrobial and wear performance of Cu-Zr-Al metallic glass composites

Survey of BGFA Criteria for the Cu-Based Bulk Amorphous Alloys

The Effect of Ag Addition on the Enhancement of the Thermal and Mechanical Properties of CuZrAl Bulk Metallic Glasses

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