首页|A modified maxwell-pulse thermoplastic constitutive model of in-situ Ta-particle reinforced Zr-based bulk metallic glass composites

A modified maxwell-pulse thermoplastic constitutive model of in-situ Ta-particle reinforced Zr-based bulk metallic glass composites

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The impact of different Ta contents on the mechanical properties and thermoplastic forming ability of in-situ Ta-particle reinforced Zr-Cu-Al-Ni bulk metallic glass composites was studied.The composition(Zr55Cu30Ali0-Ni5)94Ta6 with the best comprehensive performance was chose for a systematic investigation into its thermo-plastic behavior in the supercooled liquid region(SLR),with quantitative analysis conducted by the strain rate sensitivity index and activation volume.The steady-state flow stress and the stress overshoot intensity were augmented with deformation temperature decreasing,strain rate increasing,and the addition of the secondary phase,leading to a transition from Newtonian to non-Newtonian flow regime.The addition of the secondary phase deteriorated the theological properties of the material.To solve the problem that the Maxwell-Pulse constitutive model showed an inability to accurately describe the steady-state flow process.A modified consti-tutive relationship,introducing the effect of the volume fraction of Ta particles on viscosity and elastic modulus in the steady-state flow process which was ignored in Maxwell-pulse model,was established.The fitting results of the true stress-strain curves of the modified Maxwell-pulse constitutive model were in better agreement with the experimental date than those of the Maxwell-pulse constitutive model,with higher prediction accuracy.The modified constitutive model well predicted the thermoplastic deformation behavior of(Zr55Cu30Al10Ni5)94Ta6.The influence mechanism of Ta particles on the flow behavior was explained that Ta particles increased the viscosity of amorphous matrix,thereby hindering its flow and ultimately leading to an increase in flow stress.

Bulk metallic glass compositesSupercooled liquid regionThermoplastic deformationConstitutive modelInfluence mechanism

Pan Gong、Zhuang Wang、Guoqing Yu、Maojun Li、Xin Zhuo、Xuefeng Tang、Mao Zhang、Lei Deng、Junsong Jin、A.A.Churakova、Xinyun Wang

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State Key Laboratory of Materials Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan,Hubei,430074,China

State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle,Hunan University,Changsha,410082,China

Institute of Molecule and Crystal Physics,Ufa Federal Research Center RAS,151 Pr.Oktyabrya,Ufa,450075,Russia

2024

10.1016/j.pnsc.2024.07.004

自然科学进展·国际材料(英文)
国家自然科学基金委员会

自然科学进展·国际材料(英文)

影响因子：0.25
ISSN：1002-0071
年,卷(期)：2024.34(4)