2015年 第1卷 第1期
《工程（英文）》 >> 2015年 第1卷 第1期 doi: 10.15302/J-ENG-2015013
双金属电子束选区熔化的硬件开发与成形实验
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
# These authors contributed equally to this work.
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摘要
电子束选区熔化（EBSM）是一种利用电子束扫描、熔化金属粉末逐层制造三维实体零件的增材制造技术。近年来，EBSM已经成功应用于多种材料的增材制造。现有EBSM工艺方面的研究主要聚焦于单种材料的成形，本研究提出一种能够利用两种粉末材料成形梯度结构的EBSM工艺，提出基于振动的粉末供给方法，并实现了两种粉末材料独立供给并混合。利用Ti6Al4V和Ti47Al2Cr2Nb两种材料进行成形。Ti6Al4V在室温下有很好的强度与塑性，而Ti47Al2Cr2Nb在高温下性能优良，但有很大的室温脆性。本研究提出的双金属EBSM工艺成功制备了Ti6Al4V/Ti47Al2Cr2Nb梯度结构，并利用光学显微镜、扫描电子显微镜、电子微探针分析等方法研究了该梯度结构的微观组织和化学成分。结果显示，梯度结构的截面厚度约为300 μm，没有裂纹，化学成分在界面处呈阶梯式变化。
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