Advances in Titanium Alloys: Mechanical Properties, Microstructure and Ultrasonic Impact Treatment
Deadline for manuscript submissions: 20 March 2024 | Viewed by 5807
Due to the remarkable combination of high strength-to-weight ratio, strong resistance to creep, excellent corrosion resistance, and low heat conductivity, titanium and its alloys have been extensively used in a wide range of applications in aerospace, biomedical, chemical, marine, automotive, and many other industries. However, the poor wear resistance of titanium alloys is still the main shortcoming that restricts their applications, particularly in areas involving friction and wear.
Currently, ultrasonic impact treatment (UIT) and its modifications (ultrasonic impact peening, ultrasonic nanostructural surface modification, etc.) are effective methods for surface hardening that significantly improves functional properties of structural materials, as well as their welded joints. Surface deformation by means of a metallic striker oscillating with ultrasonic frequency is accompanied by refinement of grains and subgrains in polycrystalline materials down to nano- and submicron-size ranges, development of compressive stresses in the surface layer of the specimens, a decrease in surface roughness, etc., that considerably increases the yield point and the tensile strength, the fatigue strength, the wear resistance, the corrosion resistance, and other characteristics of structural materials. Unlike shot peening, sandblasting, SMAT, and other techniques of work hardening of surface layers, the impact force and the strike density in UIT can be precisely controlled that allows more effective treatment of a specimen. Moreover, ultrasonic impact treatment is an inexpensive technique that does not require complex equipment and provides capability to treat hard-to-reach areas and complex parts.
Generally, the nature of morphological changes taking place in the materials during the UIT processing is determined not only by the temperature–rate parameters, but also by their microstructures, phase compositions, the presence of carbide-forming elements, possible polymorphic transformations under severe plastic strains, etc. There is no doubt that explicit identifying the mechanisms of structural and phase transformations during repeated penetrations of a striker into the treated specimen is made possible by computer simulations. In this Special Issue, we welcome articles that focus on the experimental observations, a molecular dynamics simulation and ab initio calculation mechanisms underlying the development of structural and phase transformations in loaded titanium alloys which made it possible to explain the UIT effect on their microstructure, mechanical properties, as well as deformation and fracture behavior under different external actions.
Prof. Dr. Alexey Panin
Manuscript Submission Information
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- titanium alloys
- ultrasonic impact treatment
- phase transformation
- surface hardening
- mechanical properties