Fracture behaviors under pure shear loading in bulk metallic glasses

Pure shear fracture test, as a special mechanical means, had been carried out extensively to obtain the critical information for traditional metallic crystalline materials and rocks, such as the intrinsic deformation behavior and fracture mechanism. However, for bulk metallic glasses (BMGs), the pure shear fracture behaviors have not been investigated systematically due to the lack of a suitable test method. Here, we specially introduce a unique antisymmetrical four-point bend shear test method to realize a uniform pure shear stress field and study the pure shear fracture behaviors of two kinds of BMGs, Zr-based and La-based BMGs. All kinds of fracture behaviors, the pure shear fracture strength, fracture angle and fracture surface morphology, are systematically analyzed and compared with those of the conventional compressive and tensile fracture. Our results indicate that both the Zr-based and La-based BMGs follow the same fracture mechanism under pure shear loading, which is significantly different from the situation of some previous research results. Our results might offer new enlightenment on the intrinsic deformation and fracture mechanism of BMGs and other amorphous materials.

[1]  The Crystalline Structure of Metals. (Second Paper) , 1900 .

[2]  A. Argon,et al.  The mechanism of fracture in glassy materials capable of some inelastic deformation , 1976 .

[3]  Frans Spaepen,et al.  A microscopic mechanism for steady state inhomogeneous flow in metallic glasses , 1977 .

[4]  A. Argon.  Plastic deformation in metallic glasses , 1979 .

[5]  John W. Hutchinson,et al.  Strain localization in amorphous metals , 1982 .

[6]  D. F. Adams,et al.  The losipescu shear test as applied to composite materials , 1983 .

[7]  J. Sullivan,et al.  Shear properties and a stress analysis obtained from vinyl-ester losipescu specimens , 1984 .

[8]  Mircea Arcan,et al.  The iosipescu shear test as applied to composite materials , 1984 .

[9]  G. L. Farley,et al.  An Evaluation of the Iosipescu Specimen for Composite Materials Shear Property Measurement , 1991 .

[10]  T. Nieh,et al.  Effect of strain rate on compressive behavior of a Pd40Ni40P20 bulk metallic glass , 2002 .

[11]  J. Eckert,et al.  Difference in compressive and tensile fracture mechanisms of Zr59CU20Al10Ni8Ti3 bulk metallic glass , 2003 .

[12]  J. Eckert,et al.  Difference in compressive and tensile fracture mechanisms of Zr 59 Cu 20 Al 10 Ni 8 Ti 3 bulk metallic glass , 2003 .

[13]  W. Wang,et al.  Fracture of brittle metallic glasses: brittleness or plasticity. , 2005, Physical review letters.

[14]  J. Eckert,et al.  Unified tensile fracture criterion. , 2005, Physical review letters.

[15]  Weihua Wang,et al.  Intrinsic plasticity or brittleness of metallic glasses , 2005 .

[16]  R. Dauskardt,et al.  Mode II fracture behavior of a Zr-based bulk metallic glass , 2006 .

[17]  P. A. M. Hotsenpiller,et al.  Glasses , 2020, CRC HANDBOOK of LASER SCIENCE and TECHNOLOGY.

[18]  J. Langer.  Shear-transformation-zone theory of deformation in metallic glasses , 2006 .

[19]  W. Wang,et al.  Nanoscale periodic morphologies on the fracture surface of brittle metallic glasses. , 2007, Physical review letters.

[20]  A. Inoue,et al.  Micromechanisms of serrated flow in a Ni50Pd30P20 bulk metallic glass with a large compression plasticity , 2008 .

[21]  U. Ramamurty,et al.  Mixed mode (I and II) crack tip fields in bulk metallic glasses , 2009 .

[22]  W. Wang,et al.  Thermodynamic origins of shear band formation and the universal scaling law of metallic glass strength. , 2009, Physical review letters.

[23]  J. Eckert,et al.  Tensile fracture morphologies of bulk metallic glass , 2010 .

[24]  C. Liu,et al.  Atomistic free-volume zones and inelastic deformation of metallic glasses. , 2010, Nature materials.

[25]  Thomas B. Stoughton,et al.  Evolution of subsequent yield surfaces and elastic constants with finite plastic deformation. Part II: A very high work hardening aluminum alloy (annealed 1100 Al) , 2010 .

[26]  J. Eckert,et al.  Tensile fracture criterion of metallic glass , 2011 .

[27]  P. Murali,et al.  Atomic scale fluctuations govern brittle fracture and cavitation behavior in metallic glasses. , 2011, Physical review letters.

[28]  L. Dai,et al.  Failure criterion for metallic glasses , 2011 .

[29]  Weihua Wang,et al.  Hidden order in the fracture surface morphology of metallic glasses , 2012 .

[30]  J. Eckert,et al.  Stable fracture of a malleable Zr-based bulk metallic glass , 2012 .

[31]  Weihua Wang.  The elastic properties, elastic models and elastic perspectives of metallic glasses , 2012 .

[32]  U. Ramamurty,et al.  On the mechanism and the length scales involved in the ductile fracture of a bulk metallic glass , 2013 .

[33]  R. Qu,et al.  A universal fracture criterion for high-strength materials , 2013, Scientific Reports.

[34]  Z. Zhang,et al.  Compressive fracture morphology and mechanism of metallic glass , 2013 .

[35]  U. Ramamurty,et al.  Wallner lines, crack velocity and mechanisms of crack nucleation and growth in a brittle bulk metallic glass , 2014 .

[36]  Huajian Gao,et al.  Brittle versus ductile fracture mechanism transition in amorphous lithiated silicon: From intrinsic nanoscale cavitation to shear banding , 2015 .

[37]  U. Ramamurty,et al.  Fracture in metallic glasses: mechanics and mechanisms , 2015, International Journal of Fracture.

[38]  M. Demetriou,et al.  On the variability in fracture toughness of ‘ductile’ bulk metallic glasses , 2015 .

[39]  Weihua Wang,et al.  Spiral fracture in metallic glasses and its correlation with failure criterion , 2015 .

[40]  S. Shi,et al.  The thermal history effect on shear band initiation in metallic glass , 2016 .

[41]  Yong Huan,et al.  Macroscopic tensile plasticity by scalarizating stress distribution in bulk metallic glass , 2016, Scientific Reports.