Lab

Mathieu Brochu's Lab

About the lab

Powder Processing and Advanced Additive Manufacturing of Materials

Featured research (1)

Considerable surface roughness, dimensional deviation, and non-uniform microstructure are a few of the characteristics found on thin or micro-scale features fabricated via laser powder bed fusion (LPBF) that yield inferior and/or inconsistent mechanical properties. Femtosecond laser micromachining can aid in fabricating micro-scale parts with ultra-high dimensional precision. In this work, the surface and tensile behavior of microstruts of 500μm nominal diameter micromachined with Gaussian laser pulses of <100fs duration are characterized. Roughness parameters such as Ra=0.9±0.2μmand Rz=3.4±1.3μm are achieved on the micromachined faces. Surface-associated grains are successfully ablated with negligible microstructural damage to the microstruts. As a result, the average uniform strain under quasi-static tensile loading is measured as 54±2% compared to 42±1% for the as-built microstruts. Uniform and non-uniform deformation strain portions are separated analytically and characterized primarily via in-situ imaging. Progressive degradation of the surface and dimensional variance is observed on the micromachined test specimens. Post necking initiation, ablation-associated asperities on the micromachined surfaces evolve into notches, leading to tensile failure.

Lab head

M. Brochu
Department
  • Department of Mining and Materials Engineering

Members (31)

Ron Loehman
  • University of New Mexico
Ahmad Sorour
  • King Fahd University of Petroleum and Minerals
George E Kim
  • Perpetual Technologies
Joon-Phil Choi
  • Korea Institute of Machinery and Materials
Manas Paliwal
  • McGill University
Kewei Li
  • Taiyuan University of Technology
Yuan Tian
  • Voestalpine
J. A. Muñiz-Lerma
  • McGill University
P. C. Patnaik
P. C. Patnaik
  • Not confirmed yet
Mathieu Brochu
Mathieu Brochu
  • Not confirmed yet
Mohammad Attarian Shandiz
Mohammad Attarian Shandiz
  • Not confirmed yet
Mohammad Attarian Shandiz
Mohammad Attarian Shandiz
  • Not confirmed yet
Lucie Nguyen
Lucie Nguyen
  • Not confirmed yet
Cory Kaplin
Cory Kaplin
  • Not confirmed yet
Christophe Bescond
Christophe Bescond
  • Not confirmed yet
S. Cadney
S. Cadney
  • Not confirmed yet