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Engineering    2015, Vol. 1 Issue (1) : 124 -130
Research |
Dual-Material Electron Beam Selective Melting: Hardware Development and Validation Studies
Chao Guo1,2,3,Wenjun Ge1,2,3,Feng Lin1,2,3,()
1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2. Key Laboratory for Advanced Materials Processing Technology (Ministry of Education of China), Tsinghua University, Beijing 100084, China
3. Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Tsinghua University, Beijing 100084, China

Electron beam selective melting (EBSM) is an additive manufacturing technique that directly fabricates three-dimensional parts in a layerwise fashion by using an electron beam to scan and melt metal powder. In recent years, EBSM has been successfully used in the additive manufacturing of a variety of materials. Previous research focused on the EBSM process of a single material. In this study, a novel EBSM process capable of building a gradient structure with dual metal materials was developed, and a powder-supplying method based on vibration was put forward. Two different powders can be supplied individually and then mixed. Two materials were used in this study: Ti6Al4V powder and Ti47Al2Cr2Nb powder. Ti6Al4V has excellent strength and plasticity at room temperature, while Ti47Al2Cr2Nb has excellent performance at high temperature, but is very brittle. A Ti6Al4V/Ti47Al2Cr2Nb gradient material was successfully fabricated by the developed system. The microstructures and chemical compositions were characterized by optical microscopy, scanning microscopy, and electron microprobe analysis. Results showed that the interface thickness was about 300 μm. The interface was free of cracks, and the chemical compositions exhibited a staircase-like change within the interface.

Keywords additive manufacturing      electron beam      selective melting      gradient materials      titanium alloy      TiAl alloy     
Corresponding Authors: Feng Lin   
Just Accepted Date: 31 March 2015   Issue Date: 03 July 2015
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Chao Guo,Wenjun Ge,Feng Lin. Dual-Material Electron Beam Selective Melting: Hardware Development and Validation Studies[J]. Engineering, 2015, 1(1): 124 -130 .
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