Mechanical behavior and deformation mechanism of shape memory bulk metallic glass composites synthesized by powder metallurgy  

作　　者：Tianbing He Tiwen Lu Daniel Sopu Xiaoliang Han Haizhou Lu Kornelius Nielsch Jürgen Eckert Nevaf Ciftci Volker Uhlenwinkel Konrad Kosiba Sergio Scudino 

机构地区：[1]Leibniz IFW Dresden,Institute for Complex Materials,Helmholtzstraße 20,01069 Dresden,Germany [2]Guangdong Key Laboratory for Advanced Metallic Materials Processing,South China University of Technology,Guangzhou 510640,China [3]Erich Schmid Institute of Materials Science,Austrian Academy of Sciences,Jahnstraße 12,Leoben A-8700,Austria [4]Leibniz IFW Dresden,Institute for Metallic Materials,Helmholtzstraße 20,01069 Dresden,Germany [5]TU Dresden,Institute of Materials Science,01062 Dresden,Germany [6]TU Dresden,Institute of Applied Physics,01062 Dresden,Germany [7]Department Materials Physics,Montanuniversität Leoben,Jahnstraße 12,A-8700 Leoben,Austria [8]Leibniz Institute for Materials Engineering IWT,28359 Bremen,Germany [9]University of Bremen,Faculty of Production Engineering,28359 Bremen,Germany

出　　处：《Journal of Materials Science & Technology》2022年第19期42-54,共13页材料科学技术（英文版）

基　　金：B.Bartusch,H.Merker,N.Geiβler and B.Opitz for technical support,and L.Deng,P.Zhao for stimulating discussions.T.He and X.Han acknowledge the financial support from the China Scholarship Council(CSC).We acknowledge DESY(Hamburg,Germany),a member of the Helmholtz Association HGF,for the provision of experimental facilities.Parts of this research were carried out at PETRA III and we would like to thank Dr.Z.Hegedues and Dr.U.Lienert for assistance in using beamline P21.2.Beamtime was allocated for proposal I-20200178.

摘　　要：The synthesis of martensitic or shape-memory bulk metallic glass composites(BMGCs)via solidification of the glass-forming melts requires the meticulous selection of the chemical composition and the proper choice of the processing parameters in order to ensure that the glassy matrix coexists with the desired amount of austenitic phase.Unfortunately,a relatively limited number of such systems,where austenite and glassy matrix coexist over a wide range of compositions,is available.Here,we study the effective-ness of powder metallurgy as an alternative to solidification for the synthesis of shape memory BMGCs.Zr_(48)Cu_(36)Al_(8)Ag_(8)matrix composites with different volume fractions of Ni_(50.6)Ti_(49.4)are fabricated using hot pressing and their microstructure,mechanical properties and deformation mechanism are investigated employing experiments and simulations.The results demonstrate that shape-memory BMGCs with tun-able microstructures and properties can be synthesized by hot pressing.The phase stability of the glass and austenitic components across a wide range of compositions allows us to examine fundamental as-pects in the field of shape memory BMGCs,including the effect of the confining stress on the martensitic transformation exerted by the glassy matrix,the contribution of each phase to the plasticity and the mechanism responsible for shear band formation.The present method gives a virtually infinite choice among the possible combinations of glassy matrices and shape memory phases,expanding the range of accessible shape memory BMGCs to systems where the glassy and austenitic phases do not form simul-taneously using the solidification route.

关 键 词：Metallic glass composites Niti alloys Mechanical properties Shear bands Martensitic transformation 

分 类 号：TF12[冶金工程—粉末冶金] TB331[冶金工程—冶金物理化学]