Achieving work hardening by forming boundaries on the nanoscale in a Ti-based metallic glass matrix composite
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第15期
论文作者：Jing Fan Wei Rao Junwei Qiao P.K.Liaw Daniel ?opu Daniel Kiener Jürgen Eckert Guozheng Kang Yucheng Wu
文章页码：192 - 203
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.
Jing Fan1,2，Wei Rao3，Junwei Qiao1,2，P.K.Liaw4，Daniel ?opu5,6，Daniel Kiener7，Jürgen Eckert6,7，Guozheng Kang3，Yucheng Wu1
1. College of Materials Science and Engineering, Taiyuan University of Technology2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology3. Key Laboratory of Advanced Technologies of Materials, School of Mechanics and Engineering, Southwest Jiaotong University, Ministry of Education of China4. Department of Materials Science and Engineering, The University of Tennessee5. Technische Universit?t Darmstadt, Institut für Materialwissenschaft, Fachgebiet Materialmodellierung6. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences7. Department of Materials Science, Montanuniversit?t Leoben
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：
