A5050066409- Shape Memory Alloy Transformations
- Welding Techniques and Residual Stresses
- Advanced Welding Techniques Analysis
- Titanium Alloys Microstructure and Properties
- Microstructure and Mechanical Properties of Steels
- Laser Material Processing Techniques
- Hydrogen embrittlement and corrosion behaviors in metals
- Additive Manufacturing Materials and Processes
- High Entropy Alloys Studies
- Metal and Thin Film Mechanics
- Intermetallics and Advanced Alloy Properties
- Catalysis and Oxidation Reactions
- Transition Metal Oxide Nanomaterials
- Solidification and crystal growth phenomena
- Historical Art and Culture Studies
- Surface Treatment and Residual Stress
- Scottish History and National Identity
- Laser and Thermal Forming Techniques
- Electronic and Structural Properties of Oxides
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Metal Alloys Wear and Properties
- Electronic Packaging and Soldering Technologies
- Gyrotron and Vacuum Electronics Research
The Ohio State University
2019-2025
University of Waterloo
2013-2017
This work is the first investigation of joining NiTi and copper. The successful Nd:YAG laser welding to copper achieved in this enables new methods connecting shape memory alloys electro-mechanical systems. Joints made with an optimum peak power 2.2 kW accommodated pseudoelastic deformation NiTi, proving their use high strength actuators. Fracture occurred through cross section these defect-free joints. A lower 1.8 created weak joints limited weld penetration sheet. lack bonding resulted...
Small-scale impact welding may have several advantages over rivets: the strength can be higher, it applied right at edges in lap joints, and lighter more easily installed if simple systems developed. Laser Impact Welding (LIW) is compact simple, adapting technologies of laser shock peening. It limited terms energy that delivered to joint. Augmented (ALIW) complements optical with a small volume an exothermic detonable compound has been shown effective approach. The scope this study extended...
This study demonstrates that the thickness of target and its backing condition have a powerful effect on development wave structure in impact welds. Conventional theories experiments related to welds show angle speed flyer controlling influence jetting. These results imply control reflected stress waves can be effectively used optimize welding conditions expand range acceptable collision for good welding. Impact laser are class processes create solid-state welds, permitting formation strong...
A shape memory alloy (SMA) actuator that is biased internally would not need an external bias to achieve multiple actuation cycles. This reduce cost, complexity and weight compared standard one-way SMAs. The self-biasing actuators have been developed date a lack of geometric stability. current study NiTi using laser based vaporization process alter the bulk composition different regions. martensitic processed region was actuator, un-processed austenitic base metal internal bias. It...
Abstract Electron beam welding processes have highly accurate control of both spatial and temporal heating profiles which provide unique capabilities in dissimilar metals joining. In this work, electron welds were made between commercially pure nickel iron to determine the effect fusion zone composition on solidification behavior microstructure evolution. The weld was with a deflected circular pattern enable joining promote mixing. traveled at shallow angle approximately 1 deg joint...
The revolutionary multiple memory material technology allows local modification of shape alloy functional properties to create monolithic actuators that exhibit several different thermomechanical characteristics. In this work, high density laser energy was used process a piece NiTi allow synergistic pseudoelastic and effect behavior. resulting actuator contains self-biasing eliminating the need for separate biasing mechanism cyclic actuation. characteristics these behaviors were analyzed...