Investigation on creep properties and microstructure evolution of GH4169 alloy at different temperatures and stresses

2021 ◽  
Vol 800 ◽  
pp. 140338
Author(s):  
Xuteng Hu ◽  
Wenming Ye ◽  
Leicheng Zhang ◽  
Rong Jiang ◽  
Yingdong Song
Keyword(s):  
Microstructure Evolution ◽  
Creep Properties ◽  
Different Temperatures ◽  
Gh4169 Alloy

scholarly journals Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy

2017 ◽  
Vol 684 ◽  
pp. 617-625 ◽  
Author(s):  
Mohamed A. Afifi ◽  
Pedro Henrique R. Pereira ◽  
Ying Chun Wang ◽  
Yangwei Wang ◽  
Shukui Li ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Mg Alloy ◽  
Compressive Behavior ◽  
Ecap Processing ◽  
Different Temperatures

Microstructure Evolution and Mechanical Properties of Mg-Gd-Y-Zn-Zr Alloy during Compression

2021 ◽  
Vol 1035 ◽  
pp. 278-285
Author(s):  
Lei Chen Jia ◽  
Jian Min Yu ◽  
Guo Qin Wu ◽  
Wen Long Xu ◽  
Yong Gang Tian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Strain ◽  
Microstructure Evolution ◽  
Large Angle ◽  
Compression Behavior ◽  
Kink Bands ◽  
Long Period ◽  
Different Temperatures ◽  
Compression Temperature ◽  
Zr Alloy

The compression behavior and mechanical properties of the Mg-13Gd-4Y-2Zn-0.5Zr (wt.%) alloy filled with intragranular long-period stacking ordered (LPSO) phases at different temperatures were investigated. The results showed that the higher the compression temperature, the smaller the plastic strain that the grains withstand. The grains changed from equiaxed to flat strips when compressed at 350°C, and the morphology of the grains did not change at 450°C. Due to the existence of DRX grains, compression at 450 °C didn’t cause large-angle kink, but the kink angle at 350°C was very large. DRX grains only appeared at the grain boundaries and around the intergranular LPSO phase at the beginning of compression, and only appear at the kink bands (KBs) after the lamellar LPSO phases begin to kink. DRX grains gradually increased with the KBs increasing.

Microstructure Evolution in Samples Prepared by Filter Pressing and Sintering of Zirconia Nanopowder

2006 ◽  
Vol 45 ◽  
pp. 572-577
Author(s):  
Łukasz Zych ◽  
Krzysztof Haberko
Keyword(s):  
Particle Size ◽  
Fracture Surface ◽  
Relative Density ◽  
Detailed Analysis ◽  
Microstructure Evolution ◽  
Open Porosity ◽  
Porosity Evolution ◽  
Water Suspensions ◽  
Heat Treated ◽  
Different Temperatures

The aim of this work was the investigation of microstructure evolution during sintering of zirconia nanopowder. The powder containing 97 mol. % ZrO2 and 3 mol. %Y2O3, with particle size about 8 nm was prepared by the hydrothermal method. The flocculated and dispersed water suspensions of the powder were filter pressed under 5 MPa, which led to green bodies of relative density about 40%. Samples prepared from the suspensions showed distinct differences in densification behaviour. The observation of the microstructure evolution (i.e. density, fracture surface) in samples heat-treated at different temperatures, and detailed analysis of open porosity evolution were performed.

Recrystallization Behaviors of an Al-Zn-Mg-Cu Alloy during Multi-Pass Hot Compression

2010 ◽  
Vol 638-642 ◽  
pp. 327-332 ◽  
Author(s):  
Jian Shen ◽  
Ju Peng Li ◽  
Liang Ming Yan ◽  
Xiao Dong Yan
Keyword(s):  
Microstructure Evolution ◽  
Rolling Process ◽  
Hot Compression ◽  
Compression Tests ◽  
Slow Cooling ◽  
7050 Aluminum Alloy ◽  
Subgrain Growth ◽  
Nucleation Mechanisms ◽  
Different Temperatures ◽  
Thermomechanical Processes

Dynamic recovery (DRV) and dynamic recrystallization (DRX) play important roles during thermomechanical processes of light metals and alloys because they have obvious influence on microstructure evolution and finally on the mechanical properties of the worked material. Hot compression tests of 7050 aluminum alloy was carried out on Gleeble1500D thermomechanical simulator to modeling multi-pass hot rolling process. Microstructure evolution features of the alloy deformed to a reduction up to 80% were investigated through OM, TEM and EBSD observations. DRX behavior of the alloy during hot compression was emphasized. Some evidence of continuous DRX can be found in the alloy deformed at different temperatures and reductions. The main nucleation mechanisms of DRX are subgrain coalescence and subgrain growth. However, static recrystallization takes place in the material during slow cooling after hot compression.

Influence of Solution Temperature on Compositions Segregation and Creep Behavior of a Single Crystal Nickel-Based Superalloy

2013 ◽  
Vol 747-748 ◽  
pp. 690-696 ◽  
Author(s):  
Su Gui Tian ◽  
Y.C. Xue ◽  
Z. Zeng
Keyword(s):  
Creep Resistance ◽  
Solution Treatment ◽  
Solution Temperature ◽  
Medium Temperature ◽  
Creep Properties ◽  
Nickel Based Superalloy ◽  
Microstructure Observation ◽  
Composition Segregation ◽  
Deformation Features ◽  
Different Temperatures

By means of solution treatment at various temperatures, creep properties measurement and microstructure observation, the effects of heat treatment on composition segregation and creep properties were investigated. Results show that the various segregation extents of the elements are displayed in the alloys solution treated at different temperatures, and the segregation extent of the elements is improved with the solution temperature elevated, which may obvious improve the creep resistance of the alloy. And no rafted structure of the γ phase is detected in the alloy during creep at medium temperature. The deformation features of the alloy during creep at medium temperature are that the slipping of dislocations is activated in the γ matrix channels, and dislocations shearing into the γ phase may be decomposed to form the configuration of partials + stacking faults, which may hinder the cross-slipping of the dislocations to improve the creep resistance of the alloy.

scholarly journals Microstructure Evolution and Mechanical Properties of Tempered 5140 Alloy Steel after Proton Irradiation at Different Temperatures

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2910 ◽  
Author(s):  
Luanyue Dai ◽  
Guangyi Niu ◽  
Mingzhen Ma
Keyword(s):  
Mechanical Properties ◽  
Alloy Steel ◽  
Microstructure Evolution ◽  
Steel Surface ◽  
Proton Irradiation ◽  
Irradiation Damage ◽  
Tensile Fracture ◽  
Nanomechanical Properties ◽  
Irradiation Energy ◽  
Different Temperatures

This article introduces the effect of tempered 5140 alloy steel commonly used in engineering on its structure and mechanical properties under the action of proton irradiation. In the present study, the irradiation energy of 160 keV is applied to experimentally investigate the proton irradiation with different cumulative fluences on the tempered 5140 alloy steel. The effect of the cumulative fluence of the proton irradiation on the microstructure evolution of tempered 5140 alloy steel is studied through transmission electron microscopy. Moreover, the morphology of the tensile fracture is analyzed by scanning electron microscope. The effect of the cumulative fluence of the proton irradiation on the nanomechanical properties of tempered 5140 alloy steel is investigated with a nanomechanical tester. It is found that the surface hardening effect formed by the proton irradiation damage causes the dislocation density in the structure near the tempered 5140 alloy steel surface layer and such effect increases as the proton irradiation cumulative fluence increases. The results obtained show that the yield and tensile strength of the tempered 5140 alloy steel increase slightly as the cumulative fluence of the proton irradiation increases. However, the corresponding elongation decreases. For a stable pressure load of the nanoindentation, the hardness of the nanoindentation of the tempered 5140 alloy steel increases as the proton irradiation fluence increases. However, the corresponding indentation depth decreases. Based on the obtained results, it is concluded that proton irradiation has no significant effect on the macro- and nanomechanical properties of the tempered 5140 alloy steel. This may be attributed to the low energy of the proton irradiation, and the resulting radiation damage only acts on the thin layer of the tempered 5140 alloy steel surface.

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