Achieving work hardening by forming boundaries on the nanoscale in a Ti-based metallic glass matrix composite  

作　　者：Jing Fan Wei Rao Junwei Qiao PKLiaw Daniel Sopu Daniel Kiener Jürgen Eckert Guozheng Kang Yucheng Wu 

机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan,030024,China [2]Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan,030024,China [3]Key Laboratory of Advanced Technologies of Materials,School of Mechanics and Engineering,Southwest Jiaotong University,Ministry of Education of China,Chengdu,610031,China [4]Department of Materials Science and Engineering,The University of Tennessee,Knoxville,TN,37996-2200,USA [5]Technische Universitat Darmstadt,Institut fiir Materialwissenschaft,Fachgebiet Materialmodellierung,Otto-Bemdt-Strasse 3,D-64287,Darmstadt,Germany [6]Erich Schmid Institute of Materials Science,Austrian Academy of Sciences,Jahnstra'e 12,A-8700,Leoben,Austria [7]Department of Materials Science,Montanuniversitat Leoben,Jahnstra'e 12,A-8700,Leoben,Austria

出　　处：《Journal of Materials Science & Technology》2020年第15期192-203,共12页材料科学技术（英文版）

基　　金：financial supports of the National Natural Science Foundation of China (No. 51371122);Natural Science Foundation of Shanxi Province, China (No. 201901D111105);Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi (2019);support from National Science Foundation (DMR-1611180 and 1809640) with the program directors, Drs. G. Shifiet;financial support by the German Science Foundation (DFG) through the grant SO 1518/1-1;support through the ERC Advanced Grant INTELHYB (grant ERC-2013-ADG-340025);the support by the European Research Council under the ERC Grant Agreement (No. 771146 TOUGHIT)。

摘　　要：Achieving work hardening in metallic glass matrix composites(MGMCs) is the key to the extensive use of these attractive materials in structural and functional applications.In this study,we investigated the formation of nanoscale boundaries resulted from the interaction between matrix and dendrites,which favors the work-hardening deformation in an in-situ Ti41Zr32Ni6 Ta7 Be14 MGMC with β-Ti dendrites in a glassy matrix at room temperature.The microstructures of samples after tension were observed by highresolution transmission electron microscopy(HRTEM) and X-ray diffraction(XRD).The work-hardening mechanism of the present composites involves:(1) appearance of dense dislocation walls(DDWs),(2)proliferation of shear bands,(3) fo rmation of boundaries on the nanoscale,and(4) interactions between hard and soft phases.A theoretical model combined with experimental data reveals the deformation mechanisms in the present work,proving that the in-situ dendrites with outstanding hardening ability in the glass matrix can provide the homogeneous deformation under tensile loading at room temperature.

关 键 词：Metallic glass matrix composites Plastic deformation Work hardening Dense dislocation walls Nanoscale boundaries 

分 类 号：TB33[一般工业技术—材料科学与工程]