Effects of Addition of Al, Ti and Ag on Glass-Forming Ability of Cu50Zr50 Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 1333-1336 ◽  
Author(s):  
Qing Sheng Zhang ◽  
Wei Zhang ◽  
Akihisa Inoue
Keyword(s):  
Thermal Stability ◽  
Glass Formation ◽  
Alloy Composition ◽  
Critical Diameter ◽  
Alloy System ◽  
Glass Forming Ability ◽  
Crystalline Phases ◽  
Simultaneous Addition ◽  
Glass Forming

The thermal stability and crystalline phases precipitated from the as-cast rods of the Cu50Zr50-based alloys with addition of Al or simultaneous addition of Al/Ti or Al/Ag elements were investigated using DSC, DTA and XRD. The value of Tx, Trg and γ as a function of alloy composition shows a same trend, in which the Cu46Zr46Al8 alloy exhibits the largest value of Tx, Trg and γ. However, this trend is different from the variation of the dc with alloy composition, in which the Cu42Zr42Al8Ag8 alloy has the largest dc for glass formation. Trg′ based on Tg/Tm has a good correlation with the critical diameter for glass formation in this alloy system. It was found that the alloy with higher GFA has more complex precipitated crystalline phases from the as-cast rod with a diameter larger than the critical diameter for glass formation.

Effect of Er doping on glass-forming ability of Co50Cr15Mo14C15B6 alloy

2006 ◽  
Vol 21 (4) ◽  
pp. 958-961 ◽  
Author(s):  
H. Men ◽  
S.J. Pang ◽  
T. Zhang
Keyword(s):  
Glass Formation ◽  
Eutectic Composition ◽  
Critical Diameter ◽  
Alloy System ◽  
Glass Forming Ability ◽  
Undercooled Liquid ◽  
Bulk Glass ◽  
Er Doping ◽  
Glass Forming ◽  
Er Doped

Bulk glass formation of the Co–Cr–Mo–C–B–Er alloy system was investigated in this paper. The Co50Cr15Mo14C15B6 (at.%) alloy could be cast into fully glassy rod with a diameter up to 2 mm. By adding 2 at.% Er to this alloy, the critical diameter for glass formation reached 10 mm. The excellent glass formability of the Er-doped alloy was mainly attributed to its relatively large reduced glass transition temperature of 0.61, near-eutectic composition, and the necessity of redistribution of the Er atoms for precipitation of crystalline Co6Mo6C phase in the undercooled liquid on cooling.

High Glass-Forming Ability and Unusual Deformation Behavior of New Zr-Cu-Fe-Al Bulk Metallic Glasses

2010 ◽  
Vol 654-656 ◽  
pp. 1042-1045 ◽  
Author(s):  
Qing Sheng Zhang ◽  
Wei Zhang ◽  
Dmitri V. Louzguine-Luzgin ◽  
Akihisa Inoue
Keyword(s):  
Metallic Glasses ◽  
Glassy Alloy ◽  
Bulk Metallic Glasses ◽  
Eutectic Point ◽  
Critical Diameter ◽  
Alloy System ◽  
Glass Forming Ability ◽  
Future Application ◽  
Heat Of Mixing ◽  
Glass Forming

A new series of bulk metallic glasses were developed by addition of Fe into the ternary Zr60Cu30Al10 alloy. Although Fe-Cu element pair shows distinct immiscibility with a large positive heat of mixing, substitution of Fe for Cu significantly improves the glass-forming ability of the ternary Zr60Cu30Al10 alloy. The critical diameter for glass-formation increases from 8 mm for Zr60Cu30Al10 alloy to 20 mm for Zr60Cu25Fe5Al10 and Zr62.5Cu22.5Fe5Al10 alloys. As compared with the ternary Zr60Cu30Al10 alloy, the new quaternary Zr-Cu-Fe-Al alloys show lower liquidus temperatures. The Zr60Cu25Fe5Al10 and Zr62.5Cu22.5Fe5Al10 alloys, the best BMG-formers in this alloy system, are found to locate very near a Zr-Cu-Fe-Al eutectic point. The new Zr-Fe-Cu-Al bulk metallic glasses exhibit high strength of about 1700 MPa. The plastic strain increases from 7.8% to 11.3% with increasing the content of Fe from 0 to 12.5%. The finding of a Ni-free Zr-based bulk glassy alloy with the extremely high glass-forming ability is expected to extend the future application of bulk metallic glasses.

Bulk glass formation in the Ni–Zr–Ti–Nb–Si–Sn alloy system

2004 ◽  
Vol 19 (8) ◽  
pp. 2221-2225 ◽  
Author(s):  
J.Y. Lee ◽  
D.H. Bae ◽  
J.K. Lee ◽  
D.H. Kim
Keyword(s):  
Glass Formation ◽  
Liquidus Temperature ◽  
Eutectic Composition ◽  
Composition Range ◽  
Alloy System ◽  
Glass Forming Ability ◽  
Maximum Diameter ◽  
Bulk Glass ◽  
Glass Forming ◽  
Crystallization Onset

In this study, the effect of addition of Nb on glass formation in Ni–Ti–Zr–Si–Sn alloys has been studied. The composition range for bulk glass formation with Dmax > 2 mm (Dmax, maximum diameter for glass formation by injection cast method) becomes wider when compared with the non-Nb–containing alloy. The ΔTx (= Tx – Tg; Tx, crystallization onset temperature; Tg, glass transition temperature), Trg (= Tg/Tl; Tl, liquidus temperature) and γ [= Tx/(Tl + Tg)] values for the alloys Dmax > 2 mm are in the range of 40–59, 0.638–0.651, and 0.410–0.419, respectively. The compositions of the alloys (Dmax > 2 mm) are closer to pseudo-eutectic composition than that of the alloy without Nb, showing an improved glass forming ability. The critical cooling rate for glass formation (Dmax = 5 mm) is estimated to be order of approximately 40 K/s.

Glass-Forming Ability and Crystallization Kinetics of Hf-Ti-Cu-Ni-Al Bulk Metallic Glass

2012 ◽  
Vol 479-481 ◽  
pp. 1786-1789 ◽  
Author(s):  
Tie Jun Chen
Keyword(s):  
Thermal Stability ◽  
Crystallization Kinetics ◽  
Glass Formation ◽  
Glass Forming Ability ◽  
Ideal Condition ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Cross Sectional ◽  
Glass Forming

Multi-component Hf45.6Cu27.8Ni9.3Ti5Al12.4bulk metallic glasses (BMGs) were prepared successfully by casted into the water-cooled Cu mold. Characterization of the casted Hf45.6Cu27.8Ni9.3Ti5Al12.4rods was carried out by X-ray diffraction. The thermal stability and crystallization kinetics were followed by differential scanning calorimetry. The results show that the alloy Hf45.6Cu27.8Ni9.3Ti5Al12.4had a critical cylindrical rod diameter for glass formation, Dc, of 7 mm and the largest cross-sectional diameter (about 12.4mm) can be obtained in the ideal condition. The critical cooling rate for glass formation is 6.48K/s. The Hf45.6Cu27.8Ni9.3Ti5Al12.4BMG has larger glass forming ability and higher thermal stability.

Property of Cu-Zr-Ti Ternary Alloys

2010 ◽  
Vol 146-147 ◽  
pp. 1477-1481 ◽  
Author(s):  
An Hui Cai ◽  
Wei Ke An ◽  
Xiao Song Li ◽  
Yun Luo ◽  
Tie Lin Li
Keyword(s):  
Crystalline Phase ◽  
Glass Formation ◽  
Maximum Size ◽  
Glass Forming Ability ◽  
Ternary Alloys ◽  
Crystalline Phases ◽  
Atom Ratio ◽  
Glass Forming ◽  
Transformation Sequence

The influence of Zr on the property of Cu(50+x)Zr(40-x)Ti10 (0≤x≤30 at.%) alloys were investigated. The results show that the maximum size for the glass formation in this Cu-Zr-Ti system is less than 8 mm. The hardness increases with decreasing of the Zr content, then decreases when the Zr content exceeds 10~15 at.% due to the obvious alteration of the type of the crystalline phases and the microstructure. With decreasing of the Zr content, the transformation sequence of the main Cu-Zr phase is Cu10Zr7→Cu5Zr→Cu51Zr14; the transformation sequence of Cu-Ti phase is Cu4Ti3→CuTi→CuTi3. In addition, the atom ratio of Cu60Zr30Ti10 alloys is coherent with that of their corresponding crystalline phase, resulting in its better glass forming ability.

scholarly journals Selection of the Composition with High Glass Forming Ability in Zr-Cu-Ni-Al Bulk Metallic Glasses

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Yajuan Sun ◽  
Yumin Li ◽  
Hongjing Wang
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Critical Diameter ◽  
Glass Forming Ability ◽  
Crystalline Phases ◽  
Glass Forming ◽  
Selection Of

Three new Zr-Cu-Ni-Al bulk metallic glasses were developed through appropriate mixing of three binary eutectics Zr38.2Cu61.8, Zr51Al49, and Zr64Ni36. By suppressing solidification of competing crystalline phases, a new glass forming alloy Zr51Cu24.22Ni14.06Al10.72with the critical diameter of up to 10 mm is obtained.

Glass Formation and Thermal Stability of Mechanically Alloyed Al75Ni10Ti10Zr5 Amorphous Composites with Graphene Addition

2016 ◽  
Vol 849 ◽  
pp. 58-63 ◽  
Author(s):  
Tong Yang Wang ◽  
Zhen Xi Sun ◽  
Lan Xiang Zhang ◽  
Yan Wang
Keyword(s):  
Thermal Stability ◽  
Crystallization Temperature ◽  
Glass Formation ◽  
Milling Time ◽  
Glass Forming Ability ◽  
Mechanically Alloyed ◽  
Glass Forming ◽  
Onset Crystallization Temperature ◽  
Long Duration ◽  
Thermal Stability Of

In this study, the influence of 0.5 wt.% graphene (Gr) addition on the glass formation and thermal stability of the Al75Ni10Ti10Zr5 alloy during mechanical alloying (MA) process has been investigated. The as-milled products consist of the amorphous phase and a small amount of the AlNi nanocrystals. The results showed that the 0.5 wt.% Gr addition could shorten the amorphization process, indicating the enhancement of the glass forming ability. Moreover, the onset crystallization temperature (Tx1) slightly decreased with prolonging milling time for the as-milled alloys. However, it is worth noting that the Gr addition effectively increased the Tx1 of the as-milled Al-based amorphous composites for the long duration of MA time. The Tx1 values of the as-milled AlNiTiZrGr amorphous composites were more than 1120 K, exhibiting the highly thermal stability.

Amorphous alloy composition with high glass-formation ability in the pseudoternary Zr-[IQC-Al62Cu25.5Fe12.5]-[DQC-Al70Co15Ni15] alloy system

2003 ◽  
Vol 18 (7) ◽  
pp. 1588-1593
Author(s):  
Yi Lei ◽  
M. Calvo-Dahlborg ◽  
J.M. Dubois ◽  
Zukun Hei ◽  
P. Weisbecker ◽  
...  
Keyword(s):  
Amorphous Alloy ◽  
Melt Spinning ◽  
Alloy Composition ◽  
Structural Evolution ◽  
Alloy System ◽  
Glass Forming Ability ◽  
Icosahedral Quasicrystal ◽  
Scanning Calorimetry ◽  
Decagonal Quasicrystal ◽  
Glass Forming

A pseudoternary alloy system was constructed by combining icosahedral quasicrystal (IQC), decagonal quasicrystal (DQC), and Zr into one alloy system. Different proportions of Zr were added into pseudobinary alloy IQC80DQC20 (in wt.%). The structural evolution in these alloys is discussed. An amorphous alloy composition was found in this system. Melt-spinning amorphous alloy was produced in this composition. Through differential scanning calorimetry experiments, the amorphous alloy exhibited a high glass-forming ability comparable to that of the Inoue alloy Zr65Al7.5Cu17.5Ni10.

Effect of Alloy Composition on the Glass Forming Ability in Ca-Mg-Zn Alloy System

2005 ◽  
Vol 475-479 ◽  
pp. 3415-3418 ◽  
Author(s):  
Eun Soo Park ◽  
Won Tae Kim ◽  
Do Hyang Kim
Keyword(s):  
Alloy Composition ◽  
Ternary Eutectic ◽  
Alloy System ◽  
Amorphous Structure ◽  
Glass Forming Ability ◽  
Maximum Diameter ◽  
Glass Forming ◽  
Air Atmosphere ◽  
Mold Casting ◽  
Zn Alloy

The effect of alloy composition on the glass forming ability (GFA) of the Ca-Zn-Mg alloys has been investigated in the present study. The alloy compositions investigated are near Ca-rich ternary eutectic composition; Ca60Mg15Zn25, Ca65Mg10Zn25, Ca65Mg15Zn20, Ca65Mg20Zn15, and Ca70Mg15Zn15. Bulk metallic glass (BMG) samples with the diameter larger than 5 mm are fabricated by conventional copper mold casting method in air atmosphere. Among the parameters representing the glass forming ability, Trg and γ parameters exhibit good correlation with the maximum diameter of the fully amorphous structure in the alloy compositions investigated in the present study.

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