Effect of Strain Rate on the Microstructure Evolution and Compressive Deformation Behavior of High-Strength Cu Bulk Mate
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Effect of Strain Rate on the Microstructure Evolution and Compressive Deformation Behavior of High-Strength Cu Bulk Material Manufactured by Cold Spray Process Min-Seok Baek1 • Young-Kyun Kim1 • Kee-Ahn Lee1
Submitted: 13 August 2018 / in revised form: 1 May 2019 / Published online: 22 May 2019 Ó ASM International 2019
Abstract This study investigated the effect of strain rate (10-3-10/s) on the compressive properties of pure Cu bulk material at room temperature manufactured by cold spray process. Initial microstructural observation confirmed the sizes of ultra-fine grains to be in hundreds of nm, with dynamic recrystallization on deposited particle interfaces, and the average grain size was found to be 3.14 lm. The compression test at room temperature showed yield strength of 314-368 MPa at initial strain rate of 10-3-10/s, at a level similar to that of materials produced with the severe plastic deformation process. Meanwhile, during compressive deformation at all strain rates, work hardening occurred first, and a unique deformation behavior of work softening occurred thereafter after a certain strain. Moreover, as strain rates increased, the rates of work hardening and work softening increased simultaneously. The microstructural observation after the compressive deformation confirmed microstructure evolution in all materials, and as the strain rate increased, the average grain size decreased, and a more uniform structure was formed. Based on the above findings, this study discusses the deformation behavior in correlation with the microstructures of the cold-sprayed Cu materials at different strain rates.
This article is an invited paper selected from presentations at the 8th Asian Thermal Spray Conference (ATSC 2017) and has been expanded from the original presentation. ATSC 2017 was held in Jeju, Korea, November 6-8, 2017, and was organized by the Asian Thermal Spray Society and the Korean Thermal Spray Association. & Kee-Ahn Lee [email protected] 1
Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea
Keywords cold spray compression deformation behavior microstructure pure Cu strain rate
Introduction Cold spraying is a method of thermal spraying which accelerates powder particles at super-high speeds (5001500 m/s) in low-temperature conditions to utilize the plastic deformation caused by the impact with the substrate (Ref 1). As it forms a coating layer only with kinetic energy, it is also referred to as kinetic spraying. Unlike other thermal spray processes (i.e., arc spray, plasma spray, high-velocity oxygen fuel, laser cladding, etc.), cold spraying does not use a heat source. Cold spraying therefore does not form oxides and does not cause any phase changes and has the advantage of being able to coat materials with high thermal sensitivity (Ref 2, 3). Coldsprayed materials are also known to have high density, high bond strength and superior mechanical properties (Ref 4–6). However, despite the main advantages described above, the use of cold spray
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