Doctoral Dissertations


Xueyang Chen

Keywords and Phrases

Additive Manufacturing; Elemental Powder Mixture; Laser Metal Deposition; Material Design; Stochastic Process Modeling


"Over the past decades of years, a great deal of money has been spent to machine large and complex parts from high-performance metals (i.e., titanium components for aerospace applications), so users attempt to circumvent the high cost of materials. Laser metal deposition (LMD) is an additive manufacturing technique capable of fabricating complicated structures with superior properties. This dissertation aims to improve the applications of LMD technique for manufacturing metallic components by using various elemental powder mixture according to the following three categories of research topics. The first research topic is to investigate and develop a cost-effective possibility by using elemental powder mixture for metallic components fabrication. Based on the studies of fabricating thin-wall Ti-6Al-4V using elemental powder mixture, comparative close particle number for Ti, Al and V powder could easily get industry qualified Ti-6Al-4V components. The particle number for each element in powder blends has been proved to be a key factor for composition control in the final deposit part. The second research topic focuses on the application improvements of elemental powder manufacturing. By fabricating AlxCoFeNiCu1-x (x = 0.25, 0.5, 0.75) high entropy alloys from elemental powder based feedstocks, it enhances the usage of elemental powder to fabricate novel materials with complex compositions. The third research topic extends the applications of using elemental powder mixture to the broader area. A functionally gradient material (FGM) path is developed to successfully join titanium alloy with γ-TiAl. This dissertation leads to new knowledge for the effective fabrication of unique and complex metallic components. Moreover, the research results of the dissertation could benefit a wide range of industries"--Abstract, page iv.


Liou, Frank W.

Committee Member(s)

Midha, A. (Ashok)
Chandrashekhara, K.
Pan, Heng
He, Xiaoming


Mechanical and Aerospace Engineering

Degree Name

Ph. D. in Mechanical Engineering


Laser Aided Manufacturing Processes (LAMP) Laboratory
Missouri University of Science and Technology. Intelligent Systems Center
National Science Foundation (U.S.)
Missouri University of Science and Technology. Center for Aerospace Manufacturing Technologies
Boeing Company


NSF (National Science Foundation) grants CMMI-1547042 (Civil, Mechanical and Manufacturing Innovation) and CMMI-1625736

Research Center/Lab(s)

Intelligent Systems Center


Missouri University of Science and Technology

Publication Date

Spring 2018

Journal article titles appearing in thesis/dissertation

  • Effect of powder particle size on the fabrication of Ti-6Al-4V using direct laser metal deposition from elemental powder mixture
  • Composition control on Ti-6Al-4V fabrication by laser metal deposition from elemental powder mixture
  • Fabrication and characterization of AlxCoFeNiCu1-x high entropy alloys by laser metal deposition
  • Design and fabrication of functionally graded material from Ti to γ-TiAl by laser metal deposition


xiv, 98 pages

Note about bibliography

Includes bibliographic references.


© 2018 Xueyang Chen, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 11272

Electronic OCLC #