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Acta Metall Sin  2019, Vol. 55 Issue (12): 1561-1568    DOI: 10.11900/0412.1961.2019.00207
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Effect of Nano-Crystallization on Dynamic Compressive Property of Zr-Based Amorphous Alloy
JIN Chenri1,YANG Suyuan1,2(),DENG Xueyuan1,WANG Yangwei1,2,CHENG Xingwang1,2
1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China
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Abstract  

Zr-based amorphous alloys are characterized by high glass forming ability, high thermal stability and excellent mechanical properties. The amorphous alloys in thermodynamic metastable state have the tendency to change to metastable state with lower energy or even crystal structure in equilibrium state under certain temperature or pressure conditions. At present, few researches have been conducted on the mechanical behavior of partially crystallized Zr-Cu-Ni-Al-Nb amorphous alloys, especially the fracture behavior under dynamic loading. In this work, as-cast Zr-Cu-Ni-Al-Nb amorphous alloy was annealed to accomplish different levels of nano-crystallization by controlling holding time. DSC, XRD, HRTEM, SEM, quasi-static and dynamic compression tests were utilized to research the effect of nano-crystallization on compressive strength and fracture mechanism of Zr-based amorphous alloy under different strain rates. The results indicated that the volume fraction and size of nanoscale crystalline phase inside Zr-based amorphous alloy increased with the increasing of annealing holding time. The compressive strength of annealed Zr-based amorphous alloy increased first and then decreased with the increase of holding time. The variation of strain rates also affected the compressive strength, which decreased when the strain rate increased from 1×10-3 s-1 to 1×103 s-1, and increased when the strain rate continually increased to 3×103 s-1. Different degrees of nano-crystallization had an impact on the fracture characteristics of Zr-based amorphous alloy. As the degree of crystallization increased, the fracture morphology of compression samples changed from vein-like patterns to quasi-cleavage features and then to river patterns.

Key words:  amorphous alloy      nano-crystallization      dynamic compression      fracture morphology     
Received:  25 June 2019     
ZTFLH:  TG146.2  
Fund: National Ministries Program of China(No.2017-ZD-022)
Corresponding Authors:  Suyuan YANG     E-mail:  yangsuyuan@bit.edu.cn

Cite this article: 

JIN Chenri, YANG Suyuan, DENG Xueyuan, WANG Yangwei, CHENG Xingwang. Effect of Nano-Crystallization on Dynamic Compressive Property of Zr-Based Amorphous Alloy. Acta Metall Sin, 2019, 55(12): 1561-1568.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00207     OR     https://www.ams.org.cn/EN/Y2019/V55/I12/1561

Fig.1  Isothermal DSC curves at different temperatures (a) and the selection of holding time (b)
Fig.2  DSC curves of as-cast and annealed Zr-based amorphous alloy with different holding time
Holding time / minΔH / (J·g-1)χ / %
20-53.216
40-41.335
60-33.248
80-28.555
Table 1  Crystallization exothermic enthalpy (ΔH) and volume fraction of crystallized phase (χ) of annealed Zr-based amorphous alloy
Fig.3  XRD spectra of as-cast and annealed Zr-based amorphous alloy
Fig.4  HRTEM images and relevant SAED patterns (insets) of as-cast (a) and annealed Zr-based amorphous alloy with holding time of 20 min (b), 40 min (c), 60 min (d) and 80 min (e)
Fig.5  Compressive true stress-true strain curves of as-cast and annealed Zr-based amorphous alloy at strain rates of 1×10-3 s-1 (a), 1×103 s-1 (b) and 3×103 s-1 (c)
Fig.6  Relationship between compressive strength and crystallization volume fraction under different strain rates
Fig.7  Recycled samples of annealed Zr-based amorphous alloy with holding time of 20 min (a1~a3), 40 min (b1~b3), 60 min (c1~c3) and 80 min (d1~d3) after compression tests with strain rates of 1×10-3 s-1 (a1~d1), 1×103 s-1 (a2~d2) and 3×103 s-1 (a3~d3)
Fig.8  Compression fracture morphologies of annealed Zr-based amorphous alloy with holding time of 20 min (a1~a6), 40 min (b1~b4), 60 min (c1~c5) and 80 min (d1~d6) under different strain rates of 1×10-3 s-1 (a1, a2, b1, b2, c1, c2, d1, d2, d3), 1×103 s-1 (a3, a4, b3, c3, d4) and 3×103 s-1 (a5, a6, b4, c4, c5, d5, d6)
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