bulk metallic glasses
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Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 252
Author(s):  
Mariusz Hasiak ◽  
Beata Sobieszczańska ◽  
Amadeusz Łaszcz ◽  
Michał Biały ◽  
Jacek Chęcmanowski ◽  
...  

Microstructure, mechanical properties, corrosion resistance, and biocompatibility were studied for rapidly cooled 3 mm rods of Zr40Ti15Cu10Ni10Be25, Zr50Ti5Cu10Ni10Be25, and Zr40Ti15Cu10Ni5Si5Be25 (at.%) alloys, as well as for the reference 316L stainless steel and Ti-based Ti6Al4V alloy. Microstructure investigations confirm that Zr-based bulk metallic samples exhibit a glassy structure with minor fractions of crystalline phases. The nanoindentation tests carried out for all investigated composite materials allowed us to determine the mechanical parameters of individual phases observed in the samples. The instrumental hardness and elastic to total deformation energy ratio for every single phase observed in the manufactured Zr-based materials are higher than for the reference materials (316L stainless steel and Ti6Al4V alloy). A scratch tester used to determine the wear behavior of manufactured samples and reference materials revealed the effect of microstructure on mechanical parameters such as residual depth, friction force, and coefficient of friction. Electrochemical investigations in simulated body fluid performed up to 120 h show better or comparable corrosion resistance of Zr-based bulk metallic glasses in comparison with 316L stainless steel and Ti6Al4V alloy. The fibroblasts viability studies confirm the good biocompatibility of the produced materials. All obtained results show that fabricated biocompatible Zr-based materials are promising candidates for biomedical implants that require enhanced mechanical properties.


2021 ◽  
pp. 1-18
Author(s):  
Yugan Chen ◽  
Pingjun Tao ◽  
Weijian Zhang ◽  
Zhenghua Huang ◽  
Fuhai Li ◽  
...  

Abstract The effects of nitrogen on friction and wear properties of Zr-based bulk metallic glasses were investigated experimentally. Preparation of Amorphous Bars by copper mold suction casting method. XRD was used to characterize the structure of samples, which proved their amorphous structure. The surface properties of the samples were studied with a microhardness tester and a friction and wear tester. The wear surfaces of the sample were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results show that the introduction of nitrogen improves the hardness and wear resistance of Zr-based metallic glass. Compared with the non-N-doped Zr-based metallic glass, the N-doped Zr-based metallic glasses have higher hardness and lower wear rate. In particular, the sample with 1.5% nitrogen doping has the largest hardness (578.58hv) and the lowest wear rate (1.04 × 10−3mm3 N−1 m−1). The wear types of N-doped Zr-based amorphous on GCr15 are mainly abrasive wear and adhesive wear.


Author(s):  
Shi Jie Bryan Bin ◽  
Kai Soon Fong ◽  
Beng Wah Chua ◽  
Manoj Gupta

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yuan Wu ◽  
Di Cao ◽  
Yilin Yao ◽  
Guosheng Zhang ◽  
Jinyue Wang ◽  
...  

AbstractIntroducing regions of looser atomic packing in bulk metallic glasses (BMGs) was reported to facilitate plastic deformation, rendering BMGs more ductile at room temperature. Here, we present a different alloy design approach, namely, doping the nonmetallic elements to form densely packed motifs. The enhanced structural fluctuations in Ti-, Zr- and Cu-based BMG systems leads to improved strength and renders these solutes’ atomic neighborhoods more prone to plastic deformation at an increased critical stress. As a result, we simultaneously increased the compressive plasticity (from ∼8% to unfractured), strength (from ∼1725 to 1925 MPa) and toughness (from 87 ± 10 to 165 ± 15 MPa√m), as exemplarily demonstrated for the Zr20Cu20Hf20Ti20Ni20 BMG. Our study advances the understanding of the atomic-scale origin of structure-property relationships in amorphous solids and provides a new strategy for ductilizing BMG without sacrificing strength.


2021 ◽  
Vol 138 ◽  
pp. 107334 ◽  
Author(s):  
Kun Li ◽  
Zeyun Cai ◽  
Peng Du ◽  
Tao Xiang ◽  
Xinxin Yang ◽  
...  

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