scholarly journals Creep and Deformation of Metals and Alloys at Elevated Temperatures

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1837
Author(s):  
Nadezhda Dudova
Keyword(s):  
Elevated Temperatures ◽  
Metals And Alloys ◽  
Deformation Behaviors

Various aspects of creep and deformation behaviors of metals and alloys at elevated temperatures are of great interest to materials scientists [...]

Survey of Various Special Tests Used to Determine Elastic, Plastic, and Rupture Properties of Metals at Elevated Temperatures

1960 ◽  
Vol 82 (4) ◽  
pp. 867-880 ◽  
Author(s):  
F. Garofalo
Keyword(s):  
Elastic Moduli ◽  
Elevated Temperatures ◽  
Metals And Alloys ◽  
Solid State Reactions ◽  
Hardness Tester ◽  
Rupture Properties ◽  
The Relationship ◽  
Temperature Time ◽  
Rupture Behavior ◽  
Hot Hardness

Testing techniques employed in determining the elastic moduli, that is, Young’s modulus, shear modulus, and Poisson’s ratio, at room and elevated temperatures are described. These techniques depend on static or dynamic measurements. A comparison and an analysis of test results determined by these two methods are presented. The effect of composition, grain size, and various transformations on the elastic moduli or their temperature dependence is discussed. A review of techniques and experimental data on the effect of high strain rates on plastic and rupture behavior of metals, and alloys at elevated temperatures is presented. It is shown that recovery effects explain qualitatively the results obtained. A brief description of the various stages of recovery is also presented. The variation of hardness with temperature is discussed for pure metals and alloys, including a description of a typical hot-hardness tester. The relationship between hardness and tensile strength, creep, and creep-rupture behavior is briefly summarised. The use of the hot-hardness tester as a research tool for following solid-state reactions at elevated temperatures is discussed. These reactions may depend on temperature, time, or plastic strain or a combination of these.

scholarly journals The Temperature Dependence of Deformation Behaviors in High-Entropy Alloys: A Review

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2005
Author(s):  
Pengfei Wu ◽  
Kefu Gan ◽  
Dingshun Yan ◽  
Zhiming Li
Keyword(s):  
Single Phase ◽  
Elevated Temperatures ◽  
High Entropy Alloys ◽  
Alloy Development ◽  
Temperature Dependent ◽  
High Entropy ◽  
The Past ◽  
Different Temperatures ◽  
Deformation Behaviors ◽  
Environmental Temperatures

Over the past seventeen years, deformation behaviors of various types of high-entropy alloys (HEAs) have been investigated within a wide temperature range, from cryogenic to high temperatures, to demonstrate the excellent performance of HEAs under extreme conditions. It has been suggested that the dominated deformation mechanisms in HEAs would be varied with respect to the environmental temperatures, which significantly alters the mechanical properties. In this article, we systematically review the temperature-dependent mechanical behaviors, as well as the corresponding mechanisms of various types of HEAs, aiming to provide a comprehensive and up-to-date understanding of the recent progress achieved on this subject. More specifically, we summarize the deformation behaviors and microscale mechanisms of single-phase HEAs, metastable HEAs, precipitates-hardened HEAs and multiphase HEAs, at cryogenic, room and elevated temperatures. The possible strategies for strengthening and toughening HEAs at different temperatures are also discussed to provide new insights for further alloy development.

Tensile strength of five metals and alloys in the nanosecond load duration range at normal and elevated temperatures

2001 ◽  
Vol 25 (7) ◽  
pp. 631-639 ◽  
Author(s):  
Kurt Baumung ◽  
Hansjoachim Bluhm ◽  
Gennady I. Kanel ◽  
Georg Müller ◽  
Sergey V. Razorenov ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Elevated Temperatures ◽  
Metals And Alloys ◽  
Load Duration

scholarly journals Large-Strain Softening of Metals at Elevated Temperatures by Deformation Texture Development

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1059
Author(s):  
Michael E. Kassner ◽  
Roya Ermagan
Keyword(s):  
Dislocation Density ◽  
Strain Softening ◽  
Elevated Temperatures ◽  
Large Strain ◽  
Deformation Texture ◽  
Metals And Alloys ◽  
Texture Development ◽  
Fcc Metals ◽  
Novel Concept ◽  
Torsion Deformation

Many (if not a majority) of metals and alloys evince substantial softening with torsion deformation to strains not usually achievable in tension. Of course, softening has long been observed by discontinuous dynamic recrystallization (DDRX) but this paper will discuss cases where softening is associated by texture development with large-strain deformation that is not reliant on changes in the dislocation density. This paper discusses the work of the current authors on FCC metals and alloys and extends to a new discussion of BCC and HCP cases. The analysis of the basis for torsional softening in BCC steel and HCP Zr discussed here is a novel concept that has not been addressed in the literature before.

scholarly journals The Deformation Behaviors and Mechanism of the High-Temperature Mechanical Properties of a Ni48W35Co17 Alloy

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1755
Author(s):  
Guoliang Xie ◽  
Wenli Xue ◽  
Yilei Fu ◽  
Kai Feng ◽  
Rui Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Elevated Temperatures ◽  
Microstructural Analysis ◽  
Tensile Sample ◽  
High Temperature Mechanical Properties ◽  
Precipitated Phase ◽  
Heavy Alloys ◽  
The Matrix ◽  
Deformation Behaviors ◽  
Strength And Plasticity

Investigations of the plastic deformation mechanisms of Ni-W-based heavy alloys varying with increasing temperatures are very important for the development of hot forming processes and applications at elevated temperatures. In this study, the continuous variation of strength and plasticity of a novel Ni-W-based heavy alloy with increasing temperatures was investigated. The tensile strength of a Ni48W35Co17 sample at 600 °C was 471 MPa, which was 47% lower than that at 100 °C. A variation in an abnormal decrease in elongations at temperatures from 400 °C to 800 °C was found in this alloy. The elongation rate of the sample tensile at 600 °C was 19%, which was 73% lower than that at 100 °C. A microstructural analysis revealed that the number of twins in the sample tensile at a temperature higher than 600 °C increased considerably compared with the sample tensile at lower temperatures, indicating that the dislocation slips were suppressed during the high-temperature stretching process. The precipitates of the NiW phase were found in the 600 °C tensile sample, which was not clearly observed in the 400 °C tensile sample, suggesting that dislocation slips were affected by the formation of these precipitates. Moreover, the orientation relationship between the matrix and NiW phase was (200)Ni//(240)NiW and [001]Ni//[001]NiW. The tiny precipitated phase was the main reason for the plasticity decrease of the alloy with the temperature increase.

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