High-temperature mechanical properties of GFRP bars: Experimental database and novel degradation models

Strategic heat treatment for tailored room- and high-temperature properties in a high Nb–TiAl alloy

High-temperature mechanical properties and failure modes of UHSS wire for cable-supported bridge

Improving high-temperature mechanical properties of laser powder bed-fused Inconel 738 alloy by hot isostatic pressing: Tailoring precipitates and healing defects

Expanding ring experiments to measure high-temperature adiabatic properties

High-temperature mechanical properties and microstructure of 2.5D C/C–SiC composites applied for the brake disc of high-speed train

The relative biological effectiveness (RBE) of protons varies with multiple physical and biological factors. Phenomenological RBE models have been developed to include such factors in the estimation of a variable RBE, in contrast to the clinically applied constant RBE of 1.1. In this study, eleven published phenomenological RBE models and two plan-based models were explored and applied to simulated patient cases. All models were analysed with respect to the distribution and range of linear energy transfer (LET) and reference radiation fractionation sensitivity ((α/β)x) of their respective experimental databases. Proton therapy plans for a spread-out Bragg peak in water and three patient cases (prostate adenocarcinoma, pituitary adenoma and thoracic sarcoma) were optimised using an RBE of 1.1 in the Eclipse™ treatment planning system prior to recalculation and modelling in the FLUKA Monte Carlo code. Model estimated dose-volume parameters for the planning target volumes (PTVs) and organs at risk (OAR) were compared. The experimental in vitro databases for the various models differed greatly in the range of (α/β)x values and dose-averaged LET (LETd). There were significant variations between the model estimations, which arose from fundamental differences in the database definitions and model assumptions. The greatest variations appeared in organs with low (α/β)x and high LETd, e.g. biological doses given to late responding OARs located distal to the target in the treatment field. In general, the variation in maximum dose (D2%) was larger than the variation in mean dose and other dose metrics, with D2% of the left optic nerve ((α/β)x = 2.1 Gy) in the pituitary adenoma case showing the greatest discrepancies between models: 28–52 Gy(RBE), while D2% for RBE1.1 was 30 Gy(RBE). For all patient cases, the estimated mean RBE to the PTV was in the range 1.09–1.29 ((α/β)x = 1.5/3.1/10.6 Gy). There were considerable variations between the estimations of RBE and RBE-weighted doses from the different models. These variations were a consequence of fundamental differences in experimental databases, model assumptions and regression techniques. The results from the implementation of RBE models in dose planning studies should be evaluated in light of these deviations.

The high-temperature mechanical properties of 310S stainless steel were investigated by uniaxial tensile tests and small punch tests at the temperature from 20℃ to 600℃, and the relationship between the mechanical properties (σYS ,σUTS) and the characteristic loads (Fy, Fm) was established. The results revealed that with increasing temperature, the mechanical properties of 310S decrease, and the characteristic loads obtained by Fy_Mao, Fy_EN and Fy_E3205 are more appropriate for determining the yield strength of materials at high temperatures particularly for Fy_E3205. The fracture pattern observed in the SPT specimens indicated a mixed tough-brittle fracture accompanied by the characteristics of cleavage fracture. Additionally, the ultimate tensile strength of the material and the maximum load Fm increased slightly at 400 ℃ compared to 300 ℃ due to the precipitation of a large number of granular carbides and the increase in the grain size.

Microstructure and high-temperature mechanical properties of second-phase enhanced Mo-La2O3-ZrC alloys post-treated by cross rolling

This paper investigates the influence of SiC dosage on the high-temperature mechanical properties (compressive strength, flexural strength, and bond flexural strength) of geopolymer mortar. The findings reveal that appropriate amount of SiC was found to improve the high-temperature mechanical properties of geopolymer mortar. Compared to the specimen without SiC, the addition of 3 wt. % SiC to the geopolymer mortar resulted in a noteworthy 14.59% increase in compressive strength at 300 °C, along with respective augmentations of 24.72% and 22.54% in flexural strength and bond flexural strength at 200 °C. Utilizing the experimental data as a foundation, a thermodynamic mathematical model was formulated, linking the strength and temperature parameters of SiC-modified geopolymer mortar. Furthermore, FTIR (Raman and Fourier transform infrared) analysis indicated that the polycondensation reaction of geopolymer mortar treated at 300 °C was promoted, and the products of displacement reaction increased, which provides a plausible explanation for the observed enhancement in compressive strength at 300 °C. Consequently, it is found that the incorporation of SiC can enhance the high-temperature mechanical properties of geopolymer mortar.

This study investigated the effects of electron beam radiation on the room-temperature and high-temperature mechanical properties of two ethylene-vinyl acetate (EVA) copolymers, designated EVA 206 and EVA 212. These copolymers had varying vinyl acetate (VA) contents (6 wt.% and 12 wt.%), with the same melt flow index of 2.0 g/10 min. Samples were irradiated at doses ranging from 60 to 180 kGy. The impact of electron beam irradiation on the creep, frequency sweep, and stress–strain behaviors of the ethylene-vinyl acetate copolymers was evaluated using a dynamical mechanical analyzer (DMA). Crystallinity was measured using differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). Creep compliance was quantitatively analyzed using four-parameter and six-parameter models. While crosslinking had minimal influence on the room-temperature properties, it significantly affected the behavior at 150 °C. With increasing irradiation dose, creep compliance decreased, while the shear modulus, viscosity, and shear stress at a strain of 0.03 increased, indicating enhanced resistance to deformation. Crosslink density also increased with irradiation dose. EVA 212 with a higher vinyl acetate content exhibited a higher resistance to creep and better high-temperature mechanical properties across all measurements.

Influence of Zr on grain orientation, texture, and mechanical properties in hot- and warm-rolled FeCrAl alloys

Development of high-entropy metallic glass matrix composites with enhanced compressive mechanical properties at elevated temperatures

Al-Ti-C (CNTs) master alloys improve room temperature and high-temperature mechanical properties of ZL205A alloy

: This publication focuses on high temperature magnetic, mechanical, and electrical properties of three Fe-Co alloys intended for use in high stress and high temperature environments. The specific alloys of interest are Hiperco(trade name) Alloy 27, Hiperco(trade name) Alloy 50 and Hiperco(trade name) Alloy 50 HS. Aging related changes in magnetic, mechanical, and electrical performance throughout the material's lifetime are documented. The effect of compressive and tensile stresses that may originate from product assembly and rotational forces during operation was also studied. Information contained in this publication is only specific to the alloys with given annealing conditions since magnetic and mechanical properties depend greatly on the annealing conditions performed after cold deformation. However, absence of any grain growth during 500 deg C aging up to 5,000 hours indicates that the observed trends should be representative for the same alloy compositions with different annealing histories.

The current study of Al alloys aims to improve their high-temperature mechanical properties by forming intermetallic precipitates with high-temperature stability. Using rare earth elements (RE) to achieve this goal increases the production cost and, hence, minimizes the economic advantage of the conventional casting processes. Therefore, alternative additives/methods with reasonable costs become mandatory. Al-Ce alloys were found to be a promising group of alloys. Cerium is the most economically abundant RE that can be added to aluminum alloys. The main intermetallic phase, i.e., Al11Ce3, is characterized by its high-temperature stability compared to other Al-based intermetallic compounds. Several research works modified the morphology of the stable Al11Ce3 phase to enhance the high-temperature properties of Al-Ce alloys. These methods were heat treatment, chemical modification, and solidification processing. This review article summarizes the “few” available research works, that studied the influence of solidification processing on the microstructure features of Al-Ce alloys. Among the solidification processing techniques available, special attention was given to microstructure processing via ultrasonic treatment and the corresponding effects on mechanical properties and electrochemical behavior. Future research points were also proposed.