Enhanced plasticity in the Zr–Cu–Ni–Al–Nb alloy system by in-situ formation of two glassy phases

Chen, S.S.; Todd, Iain

doi:10.1016/j.jallcom.2015.05.140

Cited by 19 publications

(8 citation statements)

References 31 publications

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“…Accordingly, samples with different thickness are con rmed the amorphous nature which is in good agreement with the results of XRD. Up until this point we have not detected the microstructural difference, such as phase separation or heterogeneity 25,26,42,43) , between samples with different thickness. However the plasticity of BMGs can be indeed improved by adjusting the cooling rate.…”

Section: The Effect Of Cooling Rate On the Mechanical Properties Of Bmgsmentioning

confidence: 76%

“…One is the extrinsic toughening by surface treatment, pre-deformation or developing a composite microstructure with external ductile phase dispersed within the glassy matrix [16][17][18][19][20][21][22][23][24] . Another is the intrinsic toughening by designing phase separation, increasing the Poisson s ratio or the amount of free volume in BMGs, adjusting the Young s modulus and so on [25][26][27][28][29] . In generally, the latter approach can be implemented in technique through tailoring composition, changing cooling rate, thermomechanical treatment, etc.…”

Section: Introductionmentioning

confidence: 99%

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Plasticity Improvement of Zr-Based Bulk Metallic Glasses by Adjusting Oxygen Content and Cooling Rate

Lei

Yeung³

et al. 2017

Mater. Trans.

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The poor plasticity of amorphous metal at room temperature has proved to be one of the biggest obstacles for its widespread application as structural components. In present study, the experimental samples were prepared by suction-casting and high vacuum die-casting with Zr 54.6 Ti 13.8 Cu 9.3 Ni 5.8 Be 13.5 Nb 3 (at. %) to discuss the effect of the oxygen content and cooling rate on the plasticity of amorphous metal respectively. The results indicate that dendrite with appropriate dimension and fraction can be obtained by adjusting oxygen content so as to improve the plasticity of metallic glasses. Likewise, the appropriate cooling rate even above the critical cooling rate can also be quite effective to make the brittle metallic glasses obtain high plasticity.

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Section: The Effect Of Cooling Rate On the Mechanical Properties Of Bmgsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Plasticity Improvement of Zr-Based Bulk Metallic Glasses by Adjusting Oxygen Content and Cooling Rate

Lei

Yeung³

et al. 2017

Mater. Trans.

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“…Due to their formation and properties being very sensitive to the types and contents of constituent elements, some properties of ZrCu-based BMGs can be dramatically changed by doping Nb elements [8][9][10][11][12][13][14][15][16][17][18][19]. In the (Cu 50 Zr 43 Al 7 ) 100-x Nb x (x = 0, 1, 3, 6, 9 at.%) BMGs, the best room-temperature plasticity, and the highest fracture strength and glass transition temperature (T g ) are presented when x = 3 [1].…”

Section: Introductionmentioning

confidence: 99%

Ab Initio Molecular Dynamics Study of the Structure and Properties of Nb-Doped Zr-Cu-Al Amorphous Alloys

Hong-qing

Zhang

Tang

2021

Metals

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In this paper, experiments were carried out on (Zr0.5Cu0.4Al0.1)100-xNbx (x = 0, 3, 6 at.%) amorphous alloys, and the corresponding ab initio molecular dynamics simulation was performed. The results showed that stable structures of Nb-centered and Al-centered icosahedral (-like) atomic clusters were formed after a small amount of (3 at.%) Nb was added. Stable and close-packed backbone structures were formed by the means of interconnection and matching of the two kinds of stable clusters in the alloys, which also enhanced the overall heterogeneity of the structures, thereby improving the strength and macroscopic plasticity. In addition, when more (6 at.%) Nb was added, the stable Al-centered clusters were replaced by some stable Nb-centered clusters in the alloys, and the stability and heterogeneity of the structures were partly reduced, which reduced the strength and macroscopic plasticity.

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“…between the glass transition temperature T g and the liquidus temperature T l ) [1][2][3][4][5][6] . Zr-based BMGs are of special interest due to their good glass forming ability (GFA) and promising applications as structural and functional materials [6][7][8][9][10][11][12][13][14][15][16][17] . However, their ductility at room temperature needs to be improved.…”

Section: Introductionmentioning

confidence: 99%

“…Bulk metallic glass composites (BMGCs) are among the options to improve the ductility, and they can be formed in situ or exsitu [3][4][5] . Heat treatment is one of the methods to obtain the BMGCs in situ, and it has important effects on the microstructures, mechanical properties, corrosion and electrochemical properties [10][11][12][13][14][15][16][17] . In this work, effects of annealing temperature and annealing time on the microstructure evolution and microhardness of Zr 50 Cu 40-x Al 10 Pd x (x=0-15) BMGs were investigated.…”

Section: Introductionmentioning

confidence: 99%

Effects of Annealing on Structural Evolution and Microhardness of Zr50Cu40-xAl10Pdx (x=0-15) Bulk Metallic Glasses and Composites

Zhang¹,

Shang²,

Huang³

et al. 2016

Proceedings of the 3rd International Conference on Material Engineering and Application (ICMEA 2016)

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Effects of annealing on structural evolution and microhardness of Zr 50 Cu 40-x Al 10 Pd x (x=0-15) bulk metallic glasses (BMGs) and composites were investigated using X-ray diffraction (XRD) and micro-hardness analysis. The glass transition temperature T g and the crystallization temperature T x of Zr 50 Cu 40-x Al 10 Pd x (x=0-15) BMGs are 703-728 K and 758-764 K, respectively, determined from differential scanning calorimetry (DSC) with heating rate of 10 K/min. The BMG samples were annealed at different temperatures (below T g , between T g and T x , and above T x) and for different time period (5 min, 10 min, 20 min, 30 min), and then cooled in air. Based on XRD analysis, the as-cast BMG samples and the samples annealed at 623 K (i.e. below T g) showed amorphous structures, and the samples annealed at 723-923 K (i.e. above T g) for 30 min showed amorphous-crystalline composite structures. Microhardness measurements indicated that with increasing annealing temperature, microhardness gradually increased and then leveled off.

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Enhanced plasticity in the Zr–Cu–Ni–Al–Nb alloy system by in-situ formation of two glassy phases

Cited by 19 publications

References 31 publications

Plasticity Improvement of Zr-Based Bulk Metallic Glasses by Adjusting Oxygen Content and Cooling Rate

Plasticity Improvement of Zr-Based Bulk Metallic Glasses by Adjusting Oxygen Content and Cooling Rate

Ab Initio Molecular Dynamics Study of the Structure and Properties of Nb-Doped Zr-Cu-Al Amorphous Alloys

Effects of Annealing on Structural Evolution and Microhardness of Zr50Cu40-xAl10Pdx (x=0-15) Bulk Metallic Glasses and Composites

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