scholarly journals High-Temperature Deformation of Naturally Aged 7010 Aluminum Alloy

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 581
Author(s):  
Abdulhakim A. Almajid
Keyword(s):  
Activation Energy ◽  
Aluminum Alloy ◽  
High Temperature ◽  
Threshold Stress ◽  
Activation Energies ◽  
Temperature Deformation ◽  
High Temperature Range ◽  
Temperature Range ◽  
True Activation Energy ◽  
Two Temperatures

This study is focused on the deformation mechanism and behavior of naturally aged 7010 aluminum alloy at elevated temperatures. The specimens were naturally aged for 60 days to reach a saturated hardness state. High-temperature tensile tests for the naturally aged sample were conducted at different temperatures of 573, 623, 673, and 723 K at various strain rates ranging from 5 × 10−5 to 10−2 s−1. The dependency of stress on the strain rate showed a stress exponent, n, of ~6.5 for the low two temperatures and ~4.5 for the high two temperatures. The apparent activation energies of 290 and 165 kJ/mol are observed at the low, and high-temperature range, respectively. These values of activation energies are greater than those of solute/solvent self-diffusion. The stress exponents, n, and activation energy observed are rather high and this indicates the presence of threshold stress. This behavior occurred as a result of the dislocation interaction with the second phase particles that are existed in the alloy at the testing temperatures. The threshold stress decreases in an exponential manner as temperature increases. The true activation energy was computed by incorporating the threshold stress in the power-law relation between the stress and the strain. The magnitude of the true activation energy, Qt dropped to 234 and 102 kJ/mol at the low and high-temperature range, respectively. These values are close to that of diffusion of Zinc in Aluminum and diffusion of Magnesium in Aluminum, respectively. The Zener–Hollomon parameter for the alloy was developed as a function of effective stress. The data in each region (low and high-temperature region) coalescence in a segment line in each region.

Method for extending the scale of a radiation pyrometer to the high-temperature range

1965 ◽  
Vol 8 (10) ◽  
pp. 963-965
Author(s):  
L. M. Golub ◽  
V. E. Finkel'shtein ◽  
E. S. Shpigel'man
Keyword(s):  
High Temperature ◽  
Radiation Pyrometer ◽  
High Temperature Range ◽  
Temperature Range

Defect Assessment Procedure for Low to High Temperature Range

2003 ◽  
Author(s):  
Bilal Dogan ◽  
Robert Ainsworth
Keyword(s):  
High Temperature ◽  
Growth Conditions ◽  
Life Assessment ◽  
Assessment Procedure ◽  
High Temperature Range ◽  
Temperature Range ◽  
Defect Assessment ◽  
Creep Fatigue ◽  
Recent Developments ◽  
Assessment Procedures

There are many similarities between available procedures used for defect assessment. They have been developed as a result of experience gained from material-specific programs and have often been verified using the same data. One recently updated document covering life assessment procedures under creep and creep/fatigue crack growth conditions is BS 7910. This document takes into account some of the most recent developments in the subject, including some from the British Energy R5 Procedure. Future developments in defect assessment procedures will follow the route of simplified and unified codes covering defect behaviour in the low to high temperature range. In this paper, the relevance of the insignificant creep curves in RCC-MR for defect free structures and the creep exemption criteria in BS7910 are examined. Then, an overview is given of some European developments in defect assessment methods for Fitness-for-Service assessment, based on recent and current projects such as the EC thematic network FITNET.

Development of Red Mud Coated Catalytic Filter for NOx Removal in the High Temperature Range of 300–450 °C

2019 ◽  
Vol 150 (3) ◽  
pp. 702-712 ◽  
Author(s):  
Lin Huangfu ◽  
Abdullahi Abubakar ◽  
Changming Li ◽  
Yunjia Li ◽  
Chao Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Red Mud ◽  
Nox Removal ◽  
High Temperature Range ◽  
Temperature Range ◽  
Catalytic Filter

Synthesis, structure and temperature sensing of a lanthanide-organic framework constructed from a pyridine-containing tetracarboxylic acid ligand

CrystEngComm ◽  
2018 ◽  
Vol 20 (45) ◽  
pp. 7395-7400 ◽  
Author(s):  
Dian Zhao ◽  
Huizhen Wang ◽  
Guodong Qian
Keyword(s):  
High Temperature ◽  
Metal Organic Framework ◽  
Temperature Sensing ◽  
Tetracarboxylic Acid ◽  
High Temperature Range ◽  
Temperature Range ◽  
Acid Ligand ◽  
Metal Organic ◽  
Lanthanide Metal ◽  
Organic Framework

A high sensitive, thermostable mixed lanthanide metal–organic framework, Eu0.19Tb0.81PDDI, was developed as a self-calibrated thermometer effective in the high temperature range of 313 to 473 K.

The autoignition of iso-dodecane in low to high temperature range: An experimental and modeling study

2019 ◽  
Vol 210 ◽  
pp. 222-235 ◽  
Author(s):  
Yebing Mao ◽  
Yuan Feng ◽  
Zhiyong Wu ◽  
Sixu Wang ◽  
Liang Yu ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Range ◽  
Temperature Range ◽  
Modeling Study
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