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Study on Fatigue Behavior and Fracture Mechanism of LMD Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy Based on Microstructure.
Materials (Basel)
December 2024
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127, Youyi Road (West), Xi'an 710072, China.
This study explores the fatigue behavior and fracture mechanisms of TC11 titanium alloy formed by laser metal deposition (LMD) and subjected to double annealing. The research focuses on how the alloy's unique microstructure, consisting of alternating equiaxed and columnar crystals, influences its fatigue performance. The microstructure's basket-like α' phase, made up of both plate-shaped and needle-like structures, leads to variations in crack growth behavior, as shown in the relationship between the crack growth rate and the stress intensity.
View Article and Find Full Text PDFPedicle Screw Pull-Out Strength Between the Jamshidi Needle and Pedicle Probe Techniques in an Osteoporotic Cancellous Bone Model: A Biomechanical Study.
Cureus
November 2024
Aerospace Engineering, Universiti Putra Malaysia, Kuala Lumpur, MYS.
Introduction Spinal fusion surgery with pedicle screws is commonly performed to stabilize the spine of osteoporotic patients. However, securing a strong screw fixation in osteoporotic bone presents significant challenges due to the reduced bone density. This study aimed to compare the biomechanical performance in an osteoporotic bone model of pedicle screws inserted using two different techniques, the Jamshidi needle technique and the pedicle probe technique, as well as the influence of tapping on both these techniques.
View Article and Find Full Text PDFElectrodeposited hydroxyapatite coating on titanium after ultrashort-pulsed laser processing for a novel surface of endosseous implants.
Dent Med Probl
December 2024
Department of Prosthetic Dentistry and Gerodontology, Poznan University of Medical Sciences, Poland.
Background: Ceramic endosseous implant coatings have gained esteem due to their favorable osteoinductive and osteoconductive properties. However, such a layer may be prone to failure under in vivo conditions, which necessitates its modification.
Objectives: The aim of the present study was to modify an electrodeposited hydroxyapatite (HA) coating on titanium (Ti) with ultrashort-pulsed lasers for the incorporation of the ceramic into the sample surface and the texturing of the metal surface.
Micro-CT evaluation of a nanodiamond irrigant for hard-tissue debris removal during sonic agitation.
Int Endod J
February 2025
School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.
Aim: To investigate the efficacy of nanodiamond irrigation solution with sonic agitation for removing of hard-tissue debris (HTD) within the isthmus-containing mesial roots of human mandibular molars using micro-CT analysis.
Methodology: Forty mesial roots of extracted human mandibular molars were selected based on micro-computed tomography scans (9-μm resolution). The mesial canals were mechanically prepared using ProTaper® Gold nickel-titanium rotary instruments and divided into four groups (n = 10 each) according to the final irrigation protocol: sonic agitation with nanodiamond irrigation solution for three 20-s cycles, sonic agitation with 17% EDTA for three 20-s cycles, sonic agitation with 3% NaOCl for three 20-s cycles and manual syringe irrigation with NaOCl using a 30-G needle syringe for 60 s.
Effect of Cooling Rate on α Variant Selection and Microstructure Evolution in TB17 Titanium Alloy.
Materials (Basel)
October 2024
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Article Synopsis
- - The study examines the α variant selection and microstructure changes in the metastable β titanium alloy TB17 using various characterization techniques like DTA, SEM, and XRD.
- - Rapid cooling rates resulted in minimal granular α phase formation, while slower cooling rates led to a transition from granular to needle-like α precipitates and more extensive α growth at lower cooling speeds.
- - EBSD analysis identified three categories of α variations near β grain boundaries, showcasing differences in growth directions and crystallographic orientations of α colonies.
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