Effect of Solid Solution Treatment on Corrosion Resistance of Al-Cu-Mg-Ag Alloy

2021 ◽  
Vol 1032 ◽  
pp. 213-219
Author(s):  
Zhen Hua Cui ◽  
Xiao Yan Liu ◽  
Yan Qin Wang ◽  
Hong Ru Yang ◽  
Zhen Jie Cui ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Grain Boundary ◽  
Intergranular Corrosion ◽  
Solution Treatment ◽  
Electrochemical Corrosion ◽  
Treatment Temperature ◽  
Boundary Structure ◽  
Solution Treatment Temperature ◽  
Grain Boundary Structure ◽  
Electrochemical Corrosion Resistance

In this experiment, Al-Cu-Mg-Ag alloy was used as material and solution temperature was used as variable to investigate its effect on the corrosion properties of the alloy and Hardness test, metallographic observation, electrochemical test, intergranular corrosion and exfoliation corrosion test were carried out on three groups of samples. The results show that the intergranular corrosion resistance of the alloy decreases with the increase of solution treatment temperature, and the sample treated at 505 °C has the best performance. This is mainly because grain boundary structure plays a role in increasing PFZ and expanding corrosion channels. The exfoliation corrosion resistance of Al-Cu-Mg-Ag alloy increases first and then decreases, and the sample treated at 515 °C has the best performance. This is due to the dual effects of grain boundary structure and grain morphology. On the one hand, the solution treatment temperature increases, which widens the precipitation-free zone and reduces the electrochemical corrosion resistance of the alloy. On the other hand, the increase of recrystallized grains decreases the cohesion of corrosion products and enhances the electrochemical corrosion resistance of the alloy.

Grain Boundary Engineered Lead Alloys

1996 ◽  
Vol 458 ◽  
Author(s):  
E. M. Lehockey ◽  
G. Palumbo ◽  
A. Brennenstuhl ◽  
P. Lin
Keyword(s):  
Grain Boundary ◽  
Intergranular Corrosion ◽  
Electrochemical Corrosion ◽  
Coincident Site Lattice ◽  
Grain Boundary Sliding ◽  
Boundary Structure ◽  
Clear Correlation ◽  
Special Boundaries ◽  
Grain Boundary Structure ◽  
Fold Reduction

ABSTRACTThe present work reports oii the effect of grain boundary structure on intergranular corrosion and creep by grain boundary diffusion in polycrystalline lead (Pb). “Special” boundaries characterized by low-Σ misorientations in the Coincident Site Lattice (CSL) model have been shown to exhibit resistance to grain boundary sliding and corrosion. PbCa and PbCaSn alloys having “special” grain boundary frequencies greater than 50% showed a 30 fold reduction in steady-state creep compared with corresponding as-received alloys containing 10% to 28% of low-Σ CSL boundaries in the microstructure of comparable grain size. At the same time, increasing the frequency of “special” boundaries enhanced alloy ductility with no compromize in tensile strength. Results from electrochemical corrosion tests on polarizied Pb alloys immersed in H2SO4 (S.G.=1.28) at 70°C indicate a clear correlation between the frequency of “special” boundaries and the prolifíeration of intergranular corrosion resulting in bulk weight loss from grain-dropping. Collectively, these results advocate adopting a “gram boundary design” approach in developing advanced lead-acid battery electrodes.

The Potential of HAZ Property Improvement through Control of Grain Boundary Character in a Wrought Ni-Based Superalloy

2010 ◽  
Vol 654-656 ◽  
pp. 488-491 ◽  
Author(s):  
Hyun Uk Hong ◽  
In Soo Kim ◽  
Baig Gyu Choi ◽  
Hi Won Jeong ◽  
Seong Moon Seo ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Solution Treatment ◽  
Crystallographic Analysis ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Slow Cooling ◽  
Grain Coarsening ◽  
Boundary Character ◽  
Grain Boundary Character

The effects of grain boundary serration on grain coarsening and liquation behavior in simulated weld heat-affected-zone (HAZ) of a wrought Ni-based superalloy Alloy 263 have been investigated. Recently, the present authors have found that grain boundary serration occurs in the absence of adjacent coarse γ' particles or M23C6 carbides when a specimen is direct-aged with a combination of slow cooling from solution treatment temperature to aging temperature. This serration leads to a change in grain boundary character as special boundary based on the crystallographic analysis demonstrating that the grain boundaries tend to serrate to have specific segments approaching to one {111} low-index plane at a boundary. The present study was initiated to investigate the interdependence of the serration and HAZ property with a consideration of this serration as a potential for the use of a damage-tolerant microstructure. It was found that the serrated grain boundaries suppress effectively grain coarsening, and are highly resistant to liquation cracking in HAZ due to their lower tendency to be wetted and penetrated by the liquid phase. These results reflect closely a significant decrease in interfacial energy as well as grain boundary configuration by the serration.

scholarly journals Effect of Solution Treatment Temperature on Microstructural Evolution, Precipitation Behavior, and Comprehensive Properties in UNS S32750 Super Duplex Stainless Steel

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1481
Author(s):  
Junhe Li ◽  
Wei Shen ◽  
Ping Lin ◽  
Fuming Wang ◽  
Zhanbing Yang
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Solution Treatment ◽  
Element Distribution ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Super Duplex Stainless Steel ◽  
Σ Phase ◽  
Comprehensive Properties

The changes of microstructures, element distribution, and comprehensive properties were studied to explore their interactions with each other, induced by solution treatment of UNS S32750 super duplex stainless steel. The results showed that the ferrite content improved, while the austenite content declined as the temperature increased. From 900 to 1000 °C, the σ phase existing at α/γ grain boundaries and in ferrite grains gradually dissolved. At 1050 °C, the microstructures consisted of only ferrite and austenite. From 1050 to 1300 °C, the Cr2N precipitated in ferrite and gradually grew and coarsened. The impact energy and pitting potential of UNS S32750 first improved and then weakened, while the hardness is the opposite, owing to the combined effects of element distribution, microstructures, and precipitates. In the presence of the σ phase, the corrosion resistance and mechanical properties of UNS S32750 correspond directly to the σ phase fraction. Subsequently, the rise in temperature promoted γ → α phase transformation, and the elements partitioning ratios of Cr and Mo declined, resulting in reduced toughness and corrosion resistance and a rise in hardness. Consequently, when the solution treatment temperature is 1050 °C, the α/γ ratio of UNS S32750 approached 1:1, with excellent overall properties.

Influence of Overburning on Microstructure and Property of 6061 Aluminum Alloy

2012 ◽  
Vol 476-478 ◽  
pp. 118-121 ◽  
Author(s):  
Shi Xing Zhang ◽  
Shao Min Qu
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Grain Boundary ◽  
Solution Treatment ◽  
Hardness Test ◽  
Treatment Temperature ◽  
Experimental Results ◽  
Solution Treatment Temperature ◽  
6061 Aluminum Alloy ◽  
Microstructure And Mechanical Properties

Process of solution treatment of 6061 aluminum alloy was done by hardness test and microanalysis in this paper. The effects of different solution treatment temperature on the microstructure and mechanical properties of 6061 aluminum alloy were studied and the influence of overburning on the microstructure and mechanical properties of 6061 aluminum alloy were also analyzed. The experimental results show that overburning occurring while 6061 aluminum alloy is heated above 580°C . The hardness measurements and microstructure analysis results show that the hardness decreased, grain boundary becomes trigemanal and compounded –melting structure (burnt structure) appeared when overburning occuring for this alloy .

scholarly journals Enhancing the Corrosion Resistance Performance of Mg-1.8Zn-1.74Gd-0.5Y-0.4Zr Biomaterial via Solution Treatment Process

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 836 ◽  
Author(s):  
Ya Liu ◽  
Jiuba Wen ◽  
Huai Yao ◽  
Junguang He ◽  
Huan Li
Keyword(s):  
Corrosion Resistance ◽  
Treatment Process ◽  
Cast Alloy ◽  
Solution Treatment ◽  
Treatment Temperature ◽  
Second Phase ◽  
Solution Treatment Temperature ◽  
Uniform Corrosion ◽  
Homogeneous Microstructure ◽  
Solution Treated

Microstructure and corrosion behavior of the solution-treated Mg-1.8Zn-1.74Gd-0.5Y-0.4Zr (wt%) alloy were studied. The results of microstructure indicated that the second phases of as-cast alloy was mainly comprised of Mg12Zn(Gd,Y) phase, Mg3Zn3(Gd,Y)2 phase and (Mg,Zn)3(Gd,Y) phase. After solution treatment process, the second phase gradually dissolved into the matrix, and the grain size increased. The effect of microgalvanic corrosion between α-Mg matrix and second phase was also improved. At the range of 470~510 °C solution treatment temperature, the corrosion resistance of the samples increases at first and then decreases slightly at 510 °C. All the solution-treated Mg-Zn-Gd-Y-Zr samples exhibit better corrosion resistance in comparison with as-cast sample. The existence form of the remaining phase affects the morphology of the corroded surface that relatively complete dissolution with homogeneous microstructure makes the sample more effective to obtain uniform corrosion form. The optimum temperature for solution treatment is 490 °C, which shows a much better corrosion resistance and uniform corrosion form after soaking for a long time.

Influence of Overburning on Microstructure and Property of 2024 Aluminum Alloy

2014 ◽  
Vol 941-944 ◽  
pp. 3-7 ◽  
Author(s):  
Shi Xing Zhang ◽  
Yu Ping Zhu ◽  
Gang Yi Cai
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Grain Boundary ◽  
Solution Treatment ◽  
Hardness Test ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
2024 Aluminum Alloy ◽  
Microstructure And Mechanical Properties ◽  
Hardness Tests

Process of solution treatment of 2024 aluminum alloy was done by hardness test and microanalysis in this paper. The effects of different solution treatment temperature on the microstructure and mechanical properties of 2024 aluminum alloy were studied and the influence of overburning on the microstructure and mechanical properties of 2024 aluminum alloy were also analyzed. The experimental results show that overburning occurs while 2024 aluminum alloy is heated over 490°C×50min . The hardness tests and microstructure analysis results show that the hardness decreased, grain boundary becomes trigemanal and compounded –melting structure (burnt structure) appeared when overburning occuring for this alloy .

A Study on the Formation of Serrated Grain Boundaries and its Applications in Nimonic 263

2010 ◽  
Vol 638-642 ◽  
pp. 2245-2250 ◽  
Author(s):  
Hyun Uk Hong ◽  
Hi Won Jeong ◽  
In Soo Kim ◽  
Baig Gyu Choi ◽  
Young Soo Yoo ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Creep Resistance ◽  
Solution Treatment ◽  
Interfacial Free Energy ◽  
Treatment Temperature ◽  
M23c6 Carbide ◽  
Solution Treatment Temperature ◽  
Lattice Image ◽  
Nickel Based Superalloy

The formation of serrated grain boundaries and its subsequent effect on creep resistance have been investigated in a wrought nickel based superalloy Nimonic 263. The grain boundaries were considerably serrated without the presence of γ' phases or M23C6 when a specimen was slow-cooled from the solution treatment temperature. The high resolution observation on the lattice image of the serrated grain boundary suggested that the grain boundaries tended to serrate to have specific segments approaching to one {111} low-index plane at a boundary in order to have lower interfacial free energy of grain boundary. The grain boundary serration led to a change in M23C6 carbide characteristics: the carbide morphology from granular to planar, a lowered density and their coherency pattern to two neighboring grains from consistent to zigzag. The improvement of creep resistance was noticeably observed by the introduction of GB serration without deterioration of basic mechanical properties. This improvement in creep resistance by the serration was associated with a lower rate of cavitation and crack propagation through the modification of carbide characteristics as well as grain boundary configuration.

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