scholarly journals Comparative analysis of the microstructure and mechanical properties of an Al-Cu-Mg-Ag alloy peak-aged at relatively low and high temperatures

2019 ◽  
Vol 672 ◽  
pp. 012027
Author(s):  
M Gazizov ◽  
R Holmestad ◽  
R Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
High Temperatures ◽  
Microstructure And Mechanical Properties ◽  
Peak Aged

The Effect of the Deformation Method of the Billets on Mechanical Properties of Molybdenum Bars and Wire

2020 ◽  
Vol 864 ◽  
pp. 204-210
Author(s):  
Sergey Gorbatyuk ◽  
Dmitry Efremov ◽  
Sergei Albul ◽  
Natalya Kirillova
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
High Temperatures ◽  
Rolling Mill ◽  
Mechanical Characteristics ◽  
New Technology ◽  
Deformation Resistance ◽  
Helical Rolling ◽  
Deformation Method ◽  
High Deformation

A procedure has been developed for calculating the geometric, kinematic and energy-power parameters of helical rolling, which allows a comparative analysis of the processes carried out in stands of various designs. Based on the results of this analysis, a helical rolling mill was designed and manufactured which allows to roll materials with high deformation resistance at high temperatures. The results of the study of the mechanical characteristics of molybdenum bars and wires made by new technology are presented.

Investigation on the Microstructure and Mechanical Properties of Hot Forged Mg−8Gd−2Y−1Nd−0.3Zn−0.6Zr Alloy

2011 ◽  
Vol 284-286 ◽  
pp. 1598-1602 ◽  
Author(s):  
Xiu Li Hou ◽  
Zhan Yi Cao ◽  
Li Dong Wang ◽  
Li Min Wang
Keyword(s):  
Mechanical Properties ◽  
Large Strain ◽  
Hot Forging ◽  
Tensile Tests ◽  
Age Hardening ◽  
Secondary Phases ◽  
Ageing Treatment ◽  
Size Refinement ◽  
Microstructure And Mechanical Properties ◽  
Peak Aged

The influences of hot forging and ageing treatment on the microstructure and mechanical properties of Mg−8Gd−2Y−1Nd−0.3Zn−0.6Zr (wt.%) alloy have been investigated. The results showed that the grains were significantly refined after hot forging. And the secondary phases in this alloy i.e. Mg5(Gd1-x-yNdxYy) and Mg24(Y1-x-yGdxNdy)5phases were fragmented to small particles due to the large strain during hot forging. Tensile tests revealed that mechanical properties were improved due to grain size refinement. Moreover, the as-forged alloy exhibited remarkable age-hardening response and mechanical properties were further improved by ageing treatment. The ultimate tensile strength, yield strength and elongation of the peak-aged (T5) alloy are 286 MPa, 245 MPa and 5.6 % at room temperature, and 211 MPa, 103 MPa and 19.4 % at 300°C, respectively.

Studies of the Influence of High Temperatures and Aggressive Media on the Performance Properties of O-Rings Used in the Automotive Industry

2021 ◽  
Vol 410 ◽  
pp. 587-592
Author(s):  
Gulgena D. Shakirova ◽  
Natalya V. Romanova ◽  
Lenar N. Shafigullin
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
High Temperatures ◽  
Automotive Industry ◽  
High Heat ◽  
High Heat Resistance ◽  
Performance Properties ◽  
Air Atmosphere ◽  
Heat Stable ◽  
Fluorosilicone Rubber

The paper provides the results of the studies on the influence of high temperatures and aggressive media on the performance properties of O-rings having one name but made by different manufacturers. O-rings by supplier No. 1 are made from fluorosilicone rubber, and O-rings by supplier No. 2 are made from fluororubber. The analysis of O-rings showed that the color of O-rings made from fluorosilicone rubber changed and their physical mechanical properties decreased after operation when subjected to G-energy Si-OAT and G-energy SNF coolants. The comparative analysis of TGA curves of O-rings showed that O-rings made from fluororubber were more heat stable than O-rings made from fluorosilicone rubber, i.e. they can withstand higher operating temperatures in an air atmosphere. Fluoroelastomers can recover quickly and are used to manufacture products which should have a high heat resistance during operation and high resistance to aggressive coolants.

Effect of Simulated Brazing Cycle on the Microstructure and Mechanical Properties of Cu-Cr-Zr-Ti Alloy

2012 ◽  
Vol 710 ◽  
pp. 626-631 ◽  
Author(s):  
S. Chenna Krishna ◽  
K.V. Radhika ◽  
K. Thomas Tharian ◽  
G. Sudarshan Rao ◽  
M. Swathi Kiranmayee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hardness Measurement ◽  
Rocket Engines ◽  
Aged Condition ◽  
Thrust Chamber ◽  
Microstructure And Mechanical Properties ◽  
Liquid Rocket Engines ◽  
Peak Aged Condition ◽  
Peak Aged ◽  
Liquid Rocket

Cu-Cr-Zr-Ti alloys are widely used for fabrication of thrust chamber in liquid rocket engines, because of their high thermal conductivity and adequate strength. The alloy should be used in peak-aged condition to achieve the best combination of strength and conductivity. However, realization of final component involves forming and brazing operations which limit the usage of the alloy in peak aged condition. Therefore, an attempt has been made to study the effect of the simulated brazing treatment on the microstructure and mechanical properties using optical microscopy, electron microscopy, mechanical testing and hardness measurement. The high temperature brazing treatments resulted in tremendous grain growth. The measured hardness is observed to be in line with the grain size of the specimens. The hardness and tensile strength decreased in samples subjected to simulated brazing cycle, implying requirement for a post braze treatment. After the post brazing treatment the optimum mechanical properties have been achieved at room temperature. Low ductility was observed at 600°C in the samples subjected to simulated brazing cycle.

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