Presenter: Osman Adiguzel
Affiliation: Firat University
Presentation Type: Keynote Presentation
Event: Materials and Nanotechnology Congress
Tittle: Dual
memory characteristics and lattice reaction governing reversibility in shape
memory alloys
🔬 Understanding Shape Memory
Alloys
Shape
Memory Alloys (SMAs) are advanced smart materials known for their remarkable
ability to “remember” and recover their original shape. These adaptive
structural materials exhibit dual memory characteristics:
• 🔄 Shape
Memory Effect (SME)
• ⚡ Superelasticity
These
properties allow materials to reversibly cycle between two different shapes
under varying thermal and mechanical conditions.
🌡 Shape Memory Effect
(Thermoelasticity)
The shape
memory effect is driven by thermomechanical processes. When cooled and
deformed, the alloy stores strain energy due to its softer low-temperature
state. Upon heating, this stored energy is released, enabling the material to
recover its original shape.
This
process is governed by:
• 🧩
Thermal-induced martensitic transformation
• 💪 Stress-induced martensitic transformation
• 🔁 Lattice twinning and detwinning reactions
Atomic
movements occur cooperatively along <110> directions on {110}
close-packed planes of the austenite matrix, transforming ordered parent phases
into twinned martensite structures.
⚙ Superelasticity (Mechanical
Responsiveness)
Superelasticity
occurs when stress is applied and released at constant temperature in the
austenite phase region. Immediate shape recovery follows unloading,
demonstrating elastic behavior.
While
thermoelasticity is thermally responsive, superelasticity is mechanically
responsive — both controlled by martensitic transformations and lattice
invariant shears.
🧪 Copper-Based Alloys & Diffraction
Studies
Copper-based
alloys such as CuZnAl and CuAlMn exhibit this behavior within metastable
β-phase regions (bcc-based structures). Their martensitic transformations
generate layered structures described as 3R, 9R, or 18R stacking sequences.
Advanced
X-ray and electron diffraction studies reveal:
• ✨
Superlattice reflections
• ⏳ Aging-dependent changes in peak intensities
• 🔄 Diffusive atomic redistribution at room
temperature
These
findings highlight the fundamental crystallographic mechanisms governing
reversibility in smart materials.
👨🏫 About
the Speaker
Dr. Osman
Adiguzel is Professor Emeritus at Firat University with over 45 years of
academic experience. He earned his PhD from Dicle University and completed
postdoctoral research at Surrey University, UK, focusing on shape memory
alloys.
He has
published over 80 scientific papers, presented at more than 120 international
conferences, and delivered 60+ keynote lectures in recent years. During the
global pandemic period (2020–2023), he actively participated in over 180 online
conferences.
Dr.
Adiguzel supervised multiple doctoral and master’s theses and served as
Director of the Graduate School of Natural and Applied Sciences at Firat University.
His research group received recognition from the International Centre for
Diffraction Data for contributions to the Powder Diffraction File.
🌍 Join the Global Nanotechnology Community
Event:
International Nanotechnology Conference 2026
📅 2026,November 23-25
📍 Singapore & Online
Abstract
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#ShapeMemoryAlloys
#SmartMaterials #MaterialsScience #Nanotechnology #MartensiticTransformation
#Superelasticity #Thermoelasticity #CopperAlloys #XRayDiffraction
#AdvancedMaterials #MaterialsEngineering #NanoCongress
