Fissha Biruke Teshome

ORCID: 0000-0002-4460-0142
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Research Areas
  • Shape Memory Alloy Transformations
  • High Entropy Alloys Studies
  • Advanced Welding Techniques Analysis
  • Titanium Alloys Microstructure and Properties
  • Additive Manufacturing Materials and Processes
  • Welding Techniques and Residual Stresses
  • Intermetallics and Advanced Alloy Properties
  • Aluminum Alloy Microstructure Properties
  • Microstructure and Mechanical Properties of Steels
  • Laser and Thermal Forming Techniques
  • Additive Manufacturing and 3D Printing Technologies
  • Laser Material Processing Techniques
  • Material Properties and Applications
  • Advanced Theoretical and Applied Studies in Material Sciences and Geometry
  • Aluminum Alloys Composites Properties
  • Soft Robotics and Applications
  • Hydrogen embrittlement and corrosion behaviors in metals
  • Composite Structure Analysis and Optimization
  • Tactile and Sensory Interactions
  • High-Temperature Coating Behaviors

University of Electronic Science and Technology of China
2021-2025

Obtaining a reliable NiTi to Ti6Al4V dissimilar joint exhibiting NiTi's superelasticity can provide design flexibility in aerospace and biomedical fields via integrating distinct material benefits. However, this materials couple is vulnerable severe embrittlement due the development of excessive intermetallic compounds (IMCs), namely Ti2Ni. Pd-free Pd-interlayered NiTi-Ti6Al4V laser joints were evaluated for their microstructure, compositional changes, thermodynamic mechanism, mechanical...

10.1016/j.matdes.2023.111845 article EN cc-by-nc-nd Materials & Design 2023-03-21

A computational fluid dynamics (CFD) model for double-sided friction stir spot welding (FSSW) between AZ31 and ZK60 magnesium alloys using adjustable pins is proposed in this paper. Multiple phase flow theories are combined to track the metal interface distribution FLUENT software. The heat transfer material 5 stages of process, including pre-heating, plunging, welding, rising post-heating stages, presented. For further evaluation, calculated thermal responses compared with experimental...

10.1016/j.jmrt.2022.01.097 article EN cc-by-nc-nd Journal of Materials Research and Technology 2022-01-23

NiTiCu thin walls were produced by twin-wire arc additive manufacturing (T-WAAM) using commercial NiTi and Cu wires as the feedstock materials. This approach aims to solve problems typically associated with large phase transformation hysteresis in shape memory alloys. The microstructure, mechanical properties, behavior of as-deposited alloy comprehensively examined. results revealed that was well-formed, its microstructure showed columnar, equiaxed, needle-like grains, depending on location...

10.1016/j.amf.2024.200132 article EN cc-by-nc-nd Deleted Journal 2024-03-29

The ability to integrate multiple distinct properties into a single structure is the driving force behind development of NiTi Ti6Al4V dissimilar joints. However, differences in thermophysical and subsequent brittle Ti2Ni Ni3Ti intermetallic compounds (IMCs) make fusion welding these alloys rather challenging. solidification IMC causes cracking upon significant reduction on joint mechanical properties. In this study, two strategies were used concurrently reduce formation IMC: zirconium (Zr)...

10.1080/10426914.2022.2089897 article EN Materials and Manufacturing Processes 2022-06-21

NiTi-based shape memory alloys and the Ti2AlNb alloy have gained increasing importance in aerospace field. The joining of these two materials can further increment usage relevant engineering expand their potential applications. However, when to Ti-based alloys, formation brittle Ti-rich intermetallic compounds often occurs, significantly limiting functionality use. Dissimilar joints between a NiTi were obtained using 0.1 mm thick Niobium (Nb) interlayer via laser welding. By process...

10.3390/met11101578 article EN cc-by Metals 2021-10-04

10.1007/s00170-022-09254-5 article EN The International Journal of Advanced Manufacturing Technology 2022-05-09

NiTi and Ti6A14V were materials with superior properties shared application areas while joining them fusion weld stayed as a challenge. Solidification of excessive brittle Ti <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> Ni intermetallic phases development microcracks are the main challenges creating between these alloys. Therefore, Pulsed mode welding an offset laser was employed to develop dissimilar aid Cobalt Zirconium interlayers....

10.1109/icmeas54189.2021.00031 article EN 2021-10-01

Abstract NiTi shape memory alloys (SMAs) have important applications in intelligent system design and development due to their flexibility integration through welding or joining techniques. In this work, both single-sided laser double-sided processes were used for the of SMAs wire. Then, macro-morphology, microstructure, phase transformation behavior, mechanical performance, fracture surface characteristics cyclic tensile properties samples obtained under two investigated. The results showed...

10.21203/rs.3.rs-1257475/v1 preprint EN cc-by Research Square (Research Square) 2022-01-18
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