Liverpool Skyline

Department of Maritime and Mechanical Engineering

Dr Samuel Tammas-Williams

Dr Samuel Tammas-Williams

Telephone: 0151 231 2295


Sam joined LJMU in August 2018 having moved from the University of Sheffield where he worked in the research team led by Prof. Iain Todd. Prior to that he was awarded his PhD from the University of Manchester in 2015 after completing a project supervised by Prof. Philip Prangnell. He enjoys working on industrially relevant research problems, having been awarded a fellowship by Rolls-Royce while at Sheffield to better link the academic and industry sectors, and working as an imaging consultant in the X-ray imaging laboratory in Manchester during his PhD.

His current research interests include advanced manufacturing, particularly additive manufacturing/3D printing of metals and understanding the links between manufacturing and material properties.


2015, The University of Manchester, UK, PhD
2015, University of Sheffield, UK, PGDip
2010, The University of Manchester, UK, MEng


Journal article

Hernández-Nava E, Mahoney P, Smith CJ, Donoghue J, Todd I, Tammas-Williams S. 2019. Additive manufacturing titanium components with isotropic or graded properties by hybrid electron beam melting/hot isostatic pressing powder processing Scientific Reports, 9 >DOI >Public Url

Tian Y, Gora WS, Cabo AP, Parimi LL, Hand DP, Tammas-Williams S, Prangnell PB. 2018. Material interactions in laser polishing powder bed additive manufactured Ti6Al4V components ADDITIVE MANUFACTURING, 20 :11-22 >DOI >Link

Smith CJ, Tammas-Williams S, Mahoney PS, Todd I. 2018. 3D printing a jet engine: An undergraduate project to exploit additive manufacturing now and in the future MATERIALS TODAY COMMUNICATIONS, 16 :22-25 >DOI >Link

Smith CJ, Tammas-Williams S, Hernandez-Nava E, Todd I. 2017. Tailoring the thermal conductivity of the powder bed in Electron Beam Melting (EBM) Additive Manufacturing Scientific Reports, 7 >DOI >Link >Public Url

Tammas-Williams S, Withers PJ, Todd I, Prangnell PB. 2017. The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components Scientific Reports, 7 >DOI >Link >Public Url

Hernandez-Nava E, Tammas-Williams S, Smith C, Leonard F, Withers PJ, Todd I, Goodall R. 2017. X-ray Tomography Characterisation of Lattice Structures Processed by Selective Electron Beam Melting Metals, 7 >DOI >Link >Public Url

Tammas-Williams S, Todd I. 2017. Design for additive manufacturing with site-specific properties in metals and alloys Scripta Materialia, 135 :105-110 >DOI >Link >Public Url

Hernandez-Nava E, Smith CJ, Derguti F, Tammas-Williams S, Leonard F, Withers PJ, Todd I, Goodall R. 2016. The effect of defects on the mechanical response of Ti-6Al-4V cubic lattice structures fabricated by electron beam melting Acta Materialia, 108 :279-292 >DOI >Link >Public Url

Tammas-Williams S, Withers RI, Todd I, Prangnell PB. 2016. Porosity regrowth during heat treatment of hot isostatically pressed additively manufactured titanium components Scripta Materialia, 122 :72-76 >DOI >Link >Public Url

Smith CJ, Derguti F, Nava EH, Thomas M, Tammas-Williams S, Culizia S, Fraser D, Todd I. 2016. Dimensional accuracy of Electron Beam Melting (EBM) additive manufacture with regard to weight optimized truss structures JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 229 :128-138 >DOI >Link

Tammas-Williams S, Withers PJ, Todd I, Prangnell PB. 2016. The Effectiveness of Hot Isostatic Pressing for Closing Porosity in Titanium Parts Manufactured by Selective Electron Beam Melting METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 47A :1939-1946 >DOI >Link

Hernandez-Nava E, Smith CJ, Derguti F, Tammas-Williams S, Leonard F, Withers PJ, Todd I, Goodall R. 2015. The effect of density and feature size on mechanical properties of isostructural metallic foams produced by additive manufacturing ACTA MATERIALIA, 85 :387-395 >DOI >Link

Tammas-Williams S, Zhao H, Leonard F, Derguti F, Todd I, Prangnell PB. 2015. XCT analysis of the influence of melt strategies on defect population in Ti-6Al-4V components manufactured by Selective Electron Beam Melting MATERIALS CHARACTERIZATION, 102 :47-61 >DOI >Link

Conference publication

Thompson A, Tammas-Williams S, Senin N, Todd I, Leach R. 2018. Correlating volume and surface features in additively manufactured metal parts Proceedings - 2018 ASPE and euspen Summer Topical Meeting: Advancing Precision in Additive Manufacturing, :116-120


Tammas-Williams S, Todd I. 2017. Functionally graded materials Laser-Based Additive Manufacturing of Metal Parts: Modeling, Optimization, and Control of Mechanical Properties :217-238 9781498739986 >DOI