Effect of phase coarsening on the mechanical properties of alloys: II. Mechanism analysis

2018 ◽  
Vol 201 ◽  
pp. 246-260 ◽  
Author(s):  
J.C. Li ◽  
K.G. Wang
Keyword(s):  
Mechanical Properties ◽  
Mechanism Analysis ◽  
Phase Coarsening

Effect of Alloy Composition on the Microstructure and Mechanical Properties of Al-Fe-V-Si Heat-Resistant Aluminum Alloy

2013 ◽  
Vol 433-435 ◽  
pp. 2072-2075 ◽  
Author(s):  
Jin Jun Tang ◽  
Liang Jun Fei ◽  
Zhao Hui Gong ◽  
Xiu Rong Zhu ◽  
Hong Xia Shi
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Alloy Composition ◽  
Temperature Stability ◽  
Second Phase ◽  
High Temperature Stability ◽  
Dispersion Phase ◽  
Heat Resistant ◽  
Phase Coarsening ◽  
Microstructure And Mechanical Properties

Heat-resistant aluminum alloy because of its low density, low price, good heat resistance and corrosion resistance, has been widely used in aviation, aerospace, weapons and other industrial fields. In this paper, preparation of Al-Fe-V-Si heat-resistant aluminum alloy materials is used in the RS/PM process, and studied the influence law of effect of alloy composition on the microstructure and mechanical properties of heat-resistant aluminum alloy. The results show that, Fe, V, Si element content and Fe/V ratio has great effect on the microstructure and mechanical properties. When the Fe content is too low, the content of Al12(Fe, V)3Si phase is less. Mechanics to improve material properties cannot be maximum; if the content of Fe is excessive, the strength of the material do not increase, but decrease the plastic. The addition of V element can be stabilized in Al12(Fe, V)3Si Si phase; and the addition of Si can inhibit the second-phase dispersion phase coarsening and decomposition, increase the high temperature stability of materials; Fe/V ratio affects the coarsening rate of second-phase particles, thus affecting the thermal stability of materials.

Effects of CeO2-Rich Mixed Rare Earth on the Mechanical Properties of Al2O3-Mullite Based Foam Ceramics

2010 ◽  
Vol 150-151 ◽  
pp. 815-820
Author(s):  
Shu Jun Ji ◽  
Xue Yi Guo ◽  
Jian Xiong Dong ◽  
Peng Su
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Rare Earth ◽  
Flexural Strength ◽  
Room Temperature ◽  
Strengthening Mechanism ◽  
Mechanism Analysis ◽  
Rare Earth Addition ◽  
The Matrix ◽  
Ceramic Microstructure

Using corundum, quartz, kaoline, etc, as base components and CeO2-rich mixed rare earth as modifier, foam ceramics were fabricated adopting the organic foam impregnation process. The mixed rare earth addition had much improving effects on the matrix mechanical properties owing to much glass phase and acerate mullite growing. While 3wt% was considered to be the optimal addition, in this case, homogeneous and compact ceramic microstructure with maximal glass condensation and minimal porosity formed, with the matrix compressive strength and the flexural strength at room temperature reached 0.87MPa and 0.66MPa respectively, which were 52.6% and 73.7% higher than the original samples respectively. As the mixed rare earth addition exceeded further, the compressive strength increased slowly and the flexural strength descended gradually. XRD and SEM were used to structure strengthening mechanism analysis.

The reaction mechanism analysis and mechanical properties of large-size Al2O3/ZrO2 eutectic ceramics prepared by a novel combustion synthesis

2018 ◽  
Vol 44 (11) ◽  
pp. 12987-12995 ◽  
Author(s):  
Wanjun Yu ◽  
Yongting Zheng ◽  
Yongdong Yu ◽  
Fengyu Lin ◽  
Xiaoyue Su ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Reaction Mechanism ◽  
Combustion Synthesis ◽  
Mechanism Analysis ◽  
Large Size

THE MICROSTRUCTURAL ANALYSIS OF THE EFFECT OF FIC ON GAS TURBINE BLADES

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4135-4140 ◽  
Author(s):  
HYUNG-ICK KIM ◽  
YONG HUH ◽  
HONG-SUN PARK ◽  
CHANG-SUNG SEOK ◽  
MOON-YOUNG KIM
Keyword(s):  
Mechanical Properties ◽  
Gas Turbine ◽  
Operation Mode ◽  
Turbine Blades ◽  
Microstructural Analysis ◽  
Repair Process ◽  
Optical Microscope ◽  
Important Indicator ◽  
Nickel Based Superalloy ◽  
Phase Coarsening

Advancements in superalloys permit hot gas path components to operate for many thousands of hours under severe centrifugal, thermal and vibratory stresses. The blade of a gas turbine must withstand the most severe combination of temperature, stress, and environment. After a certain period of operation, the blade is damaged by the turbine operation mode. To recover the similar initial mechanical properties, the blade of nickel-based superalloy component undergoes a replacement repair process. A fluoride ion cleaning (FIC) process is used to assist in the successful welding repair of nickel-based superalloy components. This work is to study the FIC influence on a gas turbine blade that was serviced 25,748 equivalent operating hour (EOH) after first overhaul. The blades, including the fractured regions were obtained from a plant. The conditions of blade samples were observed by optical microscope and SEM, and the chemical composition of the flaws in the blade was investigated by EDS. γ′ phase morphology is also an important indicator of the mechanical properties of blades at the high temperatures. The blade condition was examined from morphology and size of the γ′ phase, because the γ′ phase coarsening rate depends largely on the exposure time and temperature.

Effect of microbial-cemented on mechanical properties of iron tailings backfill and its mechanism analysis

2022 ◽  
Vol 318 ◽  
pp. 126001
Author(s):  
Jingping Qiu ◽  
Junchen Xiang ◽  
Wenqing Zhang ◽  
Yingliang Zhao ◽  
Xiaogang Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanism Analysis

Influence and Mechanism Analysis of Particle Size Distribution of Multi-System Mineral Admixture on Concrete Performance

2021 ◽  
Vol 1036 ◽  
pp. 386-394
Author(s):  
Fu Xing Cheng ◽  
Yong Liu ◽  
Ji Xiao ◽  
Xiao Xu Deng ◽  
Hai Long Wang
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Specific Surface ◽  
Mechanical Activation ◽  
Size Distribution ◽  
Surface Area ◽  
Specific Surface Area ◽  
Mineral Admixture ◽  
Mechanism Analysis

To explore the effect of mechanical activation on the particle size distribution of the composite admixture a self-designed test jet mill is used. We have studied the effects of different specific surface areas of composite admixtures on the workability, mechanical properties and durability of concrete and combined X-ray diffraction (XRD) with scanning electron microscopy (SEM) to analyze the mechanism of concrete performance improvement. Results showed that, mechanical activation can significantly increase the content of particles below 3 um; appropriate increase in the specific surface area of composite admixture is conducive to improving the performance of concrete; As the specific surface area increases, the hydration activity of the composite admixture increases first and then tends to be stable; during the hydration process, more thin-plate Ca(OH)2 is converted into needle-shaped AFt, which improves the cement-based material and thereby improving the macro mechanical properties and durability.

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