Ductilizing Bulk Metallic Glass Composite by Tailoring Stacking Fault Energy

Wu, Yuan; Zhou, Dan; Song, Wenming; Wang, H.; Zhang, Z. Y.; Ma, Dong; Wang, X. L.; Liu, Xiongjun

doi:10.1103/physrevlett.109.245506

Cited by 90 publications

(46 citation statements)

References 35 publications

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“…Larger values of plasticity can be attained when the twinning propensity of the particles upon loading is favored. Wu et al 21 found that the capability of the B2-CuZr phase for deformation twinning could be tailored through microalloying with transition metals since they allow the tuning of the stacking fault energy of the primary slip system of B2-CuZr phase. The purpose of microalloying is to reduce the stacking fault energy of the primary slip system of reinforcing crystals to improve the twinning propensity thus favoring the martensitic transformation.…”

Section: Metallic Glass Compositesmentioning

confidence: 99%

“…Similar results are traditionally obtained with fully crystalline shape memory materials, thus confirming the validity of the techniques for BMGs. In fact, Wu et al 21 found a few years later that promoting twinning of the reinforcing crystals present in BMGs through microalloying can improve the ductility of the BMGC similarly to that detected in microalloyed nanocrystalline materials. 22,23 Microalloying technology can be also used to tailor the structure of the amorphous phase and thus control the mechanical performance of the material.…”

Section: Introductionmentioning

confidence: 99%

“…This substitution promotes martensitic transformation of the crystalline phase and favors work-hardening during the test which contributes to delay necking of the BMG composite. 21 Another interesting element for microalloying is Fe since it not only is useful for decreasing the stacking fault energy of B2-CuZr but also is cost-effective. To further understand the influence of Co and Fe addition and their concentration on the mechanical properties of the Zr-Cu-Al system, the mechanical properties of Zr 48 Cu 48Àx Al 4 M x (M [ Co or Fe, x 5 0, 0.5, 1 at.%) BMG composites were studied.…”

Section: Metallic Glass Compositesmentioning

confidence: 99%

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Role of minor additions on metallic glasses and composites

González

2015

J. Mater. Res.

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Microalloying refers to the addition of a small concentration of an alloying element to tune the properties of the parent alloy. Microalloying technology enables to control the glass formation and the mechanical properties of bulk metallic glasses (BMGs). This manuscript presents a comprehensive review on recent developments and breakthroughs in the field of microalloying for tuning the properties of BMGs and composites with focus on the results. The ability of multiple element coaddition to optimize the glass formation and the importance of future alloy developments have been highlighted. Proper microalloying can be used to tailor not only the mechanical properties of the amorphous phase but also those of the crystalline phase, which opens up the possibility for tuning the mechanical performance at different length scales. The effectiveness in controlling the mechanical performance through microalloying was shown to greatly depend on the alloy composition and closeness to the critical amorphous diameter. A tentative outlook commenting the potential and challenges of this exciting field of research is also presented.

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Section: Metallic Glass Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Metallic Glass Compositesmentioning

confidence: 99%

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Role of minor additions on metallic glasses and composites

González

2015

J. Mater. Res.

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“…Erosion resistance of martensite is superior to that of austenite [15], which can explain the interest in promoting the formation of martensite. An efficient method to do that is doping (i.e., microalloying) using elements such as Fe, Co and Ni because when added in the proper concentrations they can decrease the stress for transformation of CuZr austenite into CuZr martensite [16,17]. As a result, BMG composites with CuZr martensite phase embedded in the amorphous matrix are of interest to enhance the wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites

et al. 2017

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The effect of nickel additions to tune the wear performance of Cu 45.5 Zr 51 Al 3.5 at. % alloy has been studied to present a new strategy for preventing excessive wear rate at high loads in metallic glass composites. This strategy consists on proper selection of a doping element in controlled concentrations with the ability to decrease the glass transition temperature (T g ) of the alloy so that the friction temperature during sliding is close to the T g . This enables the formation of crystalline phases and their subsequent oxidation (lubricating layer) on the contact surface during sliding thus enhancing the wear resistance. Proper doping can also contribute towards the wear resistance when the content of the doping element promotes the martensitic transformation. The results show that the main wear mechanism for the three studied alloys (Cu 45.5 Zr 51 Al 3.5 , Cu 44.5 Zr 51 Al 3.5 Ni 1 and Cu 43.5 Zr 51 Al 3.5 Ni 2 at. %) is governed by delamination and the mass loss increases with increasing load from 1 to 10 N. However, for the maximum load of 15 N, the calculated friction temperature is close to T g for the Ni-containing alloys and partial crystallization and oxidation take place resulting in a mass loss decrease from about 2.6 mg (at 10 N) to about 2.1 mg (at 15 N).

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“…[11][12][13][14] The easy nucleation and rapid propagation of shear bands can induce catastrophic fracture with very limited ductility, [15][16][17][18][19][20] impeding the further applications of BMGs. The fabrication of BMG matrix composites with ductile crystalline metal as reinforcement materials has yielded improvements in mechanical behavior [21][22][23][24][25][26][27][28] ; e.g., the in situ dendrite/BMG matrix composites exhibit increased both tensile and compressive strains to failure. [22][23][24][25][26][27][28] Previous studies [22][23][24] have pointed out that the ductile crystalline phase in the BMG matrix composite may have a dual role in the response of mechanical loading; they may serve as heterogeneous sites for the initiation of individual shear bands, while at the same time act as attraction or pinning centers during shear band propagation.…”

Section: Introductionmentioning

confidence: 99%

Direct Observation on the Evolution of Shear Banding and Buckling in Tungsten Fiber Reinforced Zr-Based Bulk Metallic Glass Composite

Chen

Jiang

et al. 2014

Metall Mater Trans A

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The evolution of micro-damage and deformation of each phase in the composite plays a pivotal role in the clarification of deformation mechanism of composite. However, limited model and mechanical experiments were conducted to reveal the evolution of the deformation of the two phases in the tungsten fiber reinforced Zr-based bulk metallic glass composite. In this study, quasi-static compressive tests were performed on this composite. For the first time, the evolution of micro-damage and deformation of the two phases in this composite, i.e., shear banding of the metallic glass matrix and buckling deformation of the tungsten fiber, were investigated systematically by controlling the loading process at different degrees of deformation. It is found that under uniaxial compression, buckling of the tungsten fiber occurs first, while the metallic glass matrix deforms homogeneously. Upon further loading, shear bands initiate from the fiber/ matrix interface and propagate in the metallic glass matrix. Finally, the composite fractures in a mixed mode, with splitting in the tungsten fiber, along with shear fracture in the metallic glass matrix. Through the analysis on the stress state in the composite and resistance to shear banding of the two phases during compressive deformation, the possible deformation mechanism of the composite is unveiled. The deformation map of the composite, which covers from elastic deformation to final fracture, is obtained as well.

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Ductilizing Bulk Metallic Glass Composite by Tailoring Stacking Fault Energy

Cited by 90 publications

References 35 publications

Role of minor additions on metallic glasses and composites

Role of minor additions on metallic glasses and composites

Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites

Direct Observation on the Evolution of Shear Banding and Buckling in Tungsten Fiber Reinforced Zr-Based Bulk Metallic Glass Composite

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