Chih-Cheng Chang
PhD student
Msc. at National Cheng Kung University in 2018

Main project: Assessment of mechanical properties of fusion materials by micro-mechanical testing
Funding: UCLouvain
Supervisor(s): Thomas Pardoen

My Ph.D. project is about the assessment of mechanical properties of fusion materials by micro-mechanical testing. Miniaturization of test samples is required for limiting the amount of activated materials and to allow homogeneous irradiation. It needs to be correlated with standardized test methods. This involves fracture toughness tests with miniaturized three-point bending samples or miniaturized disc-shape compact tension test samples.
And as the plasma-facing component, the materials will face severe irradiation conditions and it is thus important to demonstrate the tolerance of mechanical properties to neutron irradiation to satisfy acceptable safety limits. There are mainly three types of materials addressed in this thesis, tungsten, RAFM steel, and CuCrZr. Tungsten is a promising material for divertors that need to resist high heat flux. RAFM steel is used for structural applications. It also an appropriate material to assess the method for the determination of the DBTT (Ductile Brittle Temperature Transition) and to correlate to tungsten. Both materials are BCC structure, but steel is cheaper and easier to perform experiments in order to build a reference database. CuCrZr is used as heat sink materials.

IMMC main research direction(s):
Processing and characterisation of materials
Solid mechanics

finite elements
fracture mechanics
metallic alloys
tungsten, fusion

Research group(s): IMAP

Recent publications

See complete list of publications

Journal Articles

1. Chang, Chih-Cheng; Zhang, Tao; Pardoen, Thomas; Petrov, Roumen H.; Yin, Chao; Antusch, Steffen; Terentyev, Dmitry; Nogami, Shuhei. Ductile to brittle transition temperature of advanced tungsten alloys for nuclear fusion applications deduced by miniaturized three-point bending tests. In: International Journal of Refractory Metals and Hard Materials, Vol. 95, p. 105464 (2021). doi:10.1016/j.ijrmhm.2020.105464.