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Chinese Journal of Materials Research  2014, Vol. 28 Issue (10): 730-736    DOI: 10.11901/1005.3093.2014.153
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Micro-hardness and Shear Bands of Zr-Al-Cu-Ni-Ag Bulk Metallic Glass Composites
Tingting LI,Yong HU,Xiaoming CUI,Zhijie YAN()
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024
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Tingting LI,Yong HU,Xiaoming CUI,Zhijie YAN. Micro-hardness and Shear Bands of Zr-Al-Cu-Ni-Ag Bulk Metallic Glass Composites. Chinese Journal of Materials Research, 2014, 28(10): 730-736.

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Abstract  

Zr-Al-Cu-Ni-Ag bulk metallic glass (BMG) composites, which consisted of an amorphous matrix and embedded nanocrystallites, were prepared by isothermal annealing the Zr-Al-Cu-Ni-Ag in supercooled liquid regions. The micro-hardness of the composites was measured by Vickers indenter and the morphologies of shear bands formed due to indentation were investigated by scanning electron microscopy. The results indicate that the primary phase during annealing is icosahedral phase (I-phase) and the crystallization volume fraction monotonically increases with the increasing of annealing temperature. The micro-hardness increases with the increasing of crystallization volume fraction, while the density of shear band decreases, which are the results of structure relaxation and the precipitation of nanocrystallites.
Key words:  metallic materials      mechanical behaviors      crystallization volume fraction      micro-hardness      shear bands     
Received:  01 April 2014     
Fund: *Supported by National Natural Science Foundation of China No. 51204118, the Natural Science Foundation of Shanxi Province Nos. 2011021020-1 & 2012021018-3, the Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi (2013), and the Graduate Innovation Project of Taiyuan University of Science and Technology No. 20134009.
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Articles by authors
Tingting LI
Yong HU
Xiaoming CUI
Zhijie YAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.153     OR     https://www.cjmr.org/EN/Y2014/V28/I10/730

Fig.1  XRD spectra of the as-cast and isothermally annealed Zr65Al7.5Cu12.5Ni10Ag5 specimens. (1) as-cast, (2) 693 K-annealed, (3) 713 K-annealed, (4) 733 K-annealed and (5) 753 K-annealed
Fig.2  TEM images (a) and HRTEM image (b) of the as-cast Zr65Al7.5Cu12.5Ni10Ag5 specimen. The inset in Fig.a is the SAED pattern
Fig.3  DSC curves of the as-cast and as-annealed Zr65Al7.5Cu12.5Ni10Ag5 specimens (a) and the magnified curves of the enclosed parts (b) obtained at a scanning rate of 20 K/min
Annealled temperature As-cast 693 K 713 K 733 K 753 K
Tg/K 616 613 610 603 -
Tx1/K 693 691 685 683 -
Tx2/K 740 738 733 736 -
Tp1/K 721 716 715 - -
Tp2/K 754 754 751 757 -
ΔH/Jg-1 50.94 49.59 33.72 22.45 -
Vf/% 0 2.65 33.80 44.05 100
Micro-hardness/GPa 4.15 4.23 4.66 4.86 5.59
Shear band spacing/μm 0.54 0.58 0.64 0.72 -
Table 1  Characteristic temperatures, enthalpies and the shear band spacing of the as-cast and as-annealed specimens
Fig.4  Micro-hardness values of Zr65Al7.5Cu12.5Ni10Ag5 BMG with different crystallization volume
Fig.5  Morphologies of the subsurface deformation zones underneath the Vickers indenter of the as-cast sample (a), (b) and (c) are the magnified images of local regions in (a), Vf = 44.05% (d)
Fig.6  High magnification SEM images of subsurface Vickers indentations obtained from as-cast (a), Vf = 2.65 % (b), Vf=33.80 % (c), and Vf = 44.05 % (d)
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