Xin Lin
Xin Lin, Ph.D
Associate Dean
the School of Materials Science and Engineering,
Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Ministry of Industry and Information Technology (MIIT),
the State Key Laboratory of Solidification Processing China, Northwestern Polytechnical University (NPU), China
Biography
Prof. Dr. Xin Lin is Associate Dean of School of Materials Science and Engineering, Director of Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Ministry of Industry and Information Technology (MIIT), and Deputy Director of the State Key Laboratory of Solidification Processing China, Northwestern Polytechnical University (NPU), China. His areas of research include metal additive manufacturing (AM) and solidification. He received his PhD from NPU in 2000 and worked as a postdoctoral fellow at The Hong Kong Polytechnic University. He holds 15 Chinese patents and has published two monographs and over 400 articles in journals, such as Acta Mater., J. Crystal Growth, Scripta Materialia, Metallurgical and Materials Transactions A, Journal of Applied Physics, and Materials Science & Engineering A and B. His research on laser AM has found commercial applications in aviation, aerospace, power, energy and medical sectors, and met the urgent needs for high-performance, light-weighting, high integration and high precision fabrication tin these high-tech fields. He was appointed as a New Century Excellent Talent by the Ministry of Education China in 2006, and awarded a Newton Fellowship by Royal Society in the UK in 2015.
Abstract:
Microstructure and Compressive/Tensile Characteristic of Large Size Zr-based Bulk Metallic Glass Prepared by Laser Additive Manufacturing
The large size, crack-free Zr55Cu30Al10Ni5 bulk metallic glass (BMGs) with the diame-ter of 54 mm and the height of 15 mm was built by laser solid forming additive manu-facturing technology, whose size is larger than the critical diameter by casting. The microstructure, tensile and compressive deformation behaviors and fracture morpholo-gy of laser solid formed Zr55Cu30Al10Ni5 BMGs were investigated. It is found that the crystallization mainly occurs in the heat-affected zones of deposition layers, which consist of Al5Ni3Zr2, NiZr2, ZrCu, CuZr2 phases. The content of amorphous phase in the deposit is about 63%. Under the compressive loading, the deposit presents no plas-ticity before fracture occurs. The fracture process is mainly controlled by the shear stress and the compressive shear fracture angles of about 39°. The compressive strength reaches 1452 MPa, which is equivalent to that of as-Cast Zr55Cu30Al10Ni5 BMGs, and there exist vein-like patterns, river-like patterns and smooth regions at the compressive fractography. Under the tensile loading, the deposit presents the brittle fracture pattern without plastic deformation. The fracture process exhibits normal frac-ture model, and the tensile shear fracture angle of about 90°. The tensile strength is only about 609 MPa, and the tensile fractography mainly consists of micro-scaled cores and vein-like patterns, dimple-like patterns, chocolate-like patterns and smooth regions. The results further verified the feasibility and large potential of laser additive manufacturing on fabrication and industrial application of large-scale BMGs parts.
Associate Dean
the School of Materials Science and Engineering,
Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Ministry of Industry and Information Technology (MIIT),
the State Key Laboratory of Solidification Processing China, Northwestern Polytechnical University (NPU), China
Biography
Prof. Dr. Xin Lin is Associate Dean of School of Materials Science and Engineering, Director of Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Ministry of Industry and Information Technology (MIIT), and Deputy Director of the State Key Laboratory of Solidification Processing China, Northwestern Polytechnical University (NPU), China. His areas of research include metal additive manufacturing (AM) and solidification. He received his PhD from NPU in 2000 and worked as a postdoctoral fellow at The Hong Kong Polytechnic University. He holds 15 Chinese patents and has published two monographs and over 400 articles in journals, such as Acta Mater., J. Crystal Growth, Scripta Materialia, Metallurgical and Materials Transactions A, Journal of Applied Physics, and Materials Science & Engineering A and B. His research on laser AM has found commercial applications in aviation, aerospace, power, energy and medical sectors, and met the urgent needs for high-performance, light-weighting, high integration and high precision fabrication tin these high-tech fields. He was appointed as a New Century Excellent Talent by the Ministry of Education China in 2006, and awarded a Newton Fellowship by Royal Society in the UK in 2015.
Abstract:
Microstructure and Compressive/Tensile Characteristic of Large Size Zr-based Bulk Metallic Glass Prepared by Laser Additive Manufacturing
The large size, crack-free Zr55Cu30Al10Ni5 bulk metallic glass (BMGs) with the diame-ter of 54 mm and the height of 15 mm was built by laser solid forming additive manu-facturing technology, whose size is larger than the critical diameter by casting. The microstructure, tensile and compressive deformation behaviors and fracture morpholo-gy of laser solid formed Zr55Cu30Al10Ni5 BMGs were investigated. It is found that the crystallization mainly occurs in the heat-affected zones of deposition layers, which consist of Al5Ni3Zr2, NiZr2, ZrCu, CuZr2 phases. The content of amorphous phase in the deposit is about 63%. Under the compressive loading, the deposit presents no plas-ticity before fracture occurs. The fracture process is mainly controlled by the shear stress and the compressive shear fracture angles of about 39°. The compressive strength reaches 1452 MPa, which is equivalent to that of as-Cast Zr55Cu30Al10Ni5 BMGs, and there exist vein-like patterns, river-like patterns and smooth regions at the compressive fractography. Under the tensile loading, the deposit presents the brittle fracture pattern without plastic deformation. The fracture process exhibits normal frac-ture model, and the tensile shear fracture angle of about 90°. The tensile strength is only about 609 MPa, and the tensile fractography mainly consists of micro-scaled cores and vein-like patterns, dimple-like patterns, chocolate-like patterns and smooth regions. The results further verified the feasibility and large potential of laser additive manufacturing on fabrication and industrial application of large-scale BMGs parts.