|
| Abstract No.: |
|
Scheduled at:
|
Thursday, June 11, 2020, Hall K2 12:00 PM
Characterization & Testing Methods I
|
|
| Title: |
Mechanics of cold spray composites: An in-situ synchrotron X-ray study
|
|
| Authors: |
Lewei He / Cornell University, USA
Mostafa Hassani* / Cornell University, USA
|
|
| Abstract: |
Cold spray is a promising solid-state process for production of composite coatings. Different material classes including metals, ceramics, and intermetallics can be blended as powder feedstock or co-deposited in supersonic nozzles to form composite coatings. Cold spray coatings can take advantage of properties of their constituent phases. For instance, ductility, high thermal and electrical conductivity from metals can be combined with high corrosion and wear resistance from ceramics or creep resistance from intermetallics to create a coating that exhibits favorable properties. Although such improved mechanical properties of cold spray composites have been reported in a variety of composite compositions, it is often challenging to understand the mechanistic contributions of the constituent phases from the collective properties in such materials. Here, we employ high energy synchrotron X-rays to study deformation and failure of Ni-CrC cold spray composite as a model material. We conduct in-situ loading experiments where samples of the coating are uniaxially loaded in X-ray beams. We utilize far-field diffraction and micro-computed tomography at multiple load steps to characterize the evolution of phase-specific strains and stresses and the failure modes. Our work provides understanding of the load partitioning and load transfer between the soft and hard phases in cold spray composites, and reveals the key failure mechanisms of such materials.
|
|