Effects of in-process cryocooling on metallurgical and mechanical properties of friction stir processed Al7075 alloy

Kumar, Atul; Godasu, Ashwin Kumar; Pal, Kaushik; Mula, Suhrit

doi:10.1016/j.matchar.2018.08.001

Cited by 34 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The key idea of these works was to induce more beneficial changes in the microstructure of materials and their properties, as well as to ensure better control of the processes taking place at individual stages of machining [ 1 , 2 ]. As is known, the main condition to obtain the assumed material characteristics is appropriate selection of the process parameters and knowledge of the changes in the microstructure of the material and its properties as a function of the machining parameters [ 3 ], shape and dimensions of the tool [ 4 , 5 ] or, for example, the sample cooling method [ 6 , 7 , 8 , 9 ]. That is why systematic research in this area and experimental verification of developed concepts and ideas are so important.…”

Section: Introductionmentioning

confidence: 99%

Special Issue: Advance in Friction Stir Processed Materials

Iwaszko

Winczek

2022

Materials

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Special Issue: Advance in Friction Stir Processed Materials

Iwaszko

Winczek

2022

Materials

View full text Add to dashboard Cite

show abstract

“…The Al–Zn–Mg–Cu (7xxx) type alloys have a long history of application in the aerospace industry and are increasingly applied in the automotive industry nowadays because of their high strength and light‐weight (Mondolfo, 1971; Polmear et al, 2017; Starink, 2001). Their strength can even match many grades of steels due to the coherent/semicoherent nano‐scale η″/η′‐MgZn 2 precipitates in the matrix produced during aging treatment (Deshpande et al, 1998; Ghosh et al, 2020) or in‐process cooling (Kumar et al, 2017, 2018, 2021). However, 7xxx series of Al alloy are susceptible to SCC (Ajay Krishnan et al, 2018; Bobby‐Kannan et al, 2003; Burns et al, 2010; Kannan et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Their strength can even match many grades of steels due to the coherent/semicoherent nano-scale η 00 /η 0 -MgZn 2 precipitates in the matrix produced during aging treatment (Deshpande et al, 1998;Ghosh et al, 2020) or in-process cooling (Kumar et al, 2017(Kumar et al, , 2018(Kumar et al, , 2021. However, 7xxx series of Al alloy are susceptible to SCC (Ajay Krishnan et al, 2018;Bobby-Kannan et al, 2003;Burns et al, 2010;Kannan et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

An advantageous imaging perspective for quantitative evaluation of 7075 aluminum alloy grain boundary precipitates using scanning electron microscope

Liu¹,

Tu²,

Chen

et al. 2022

Microscopy Res & Technique

View full text Add to dashboard Cite

7075 Aluminum alloy (AA7075) samples undergone four aging sequences were examined using a scanning electron microscope (SEM) and a transmitted electron microscope (TEM). The measurements results validate the correlation between stress corrosion cracking (SCC) resistance and the size and inter‐distance of the grain boundary precipitates (GBPs). To evaluate the size and inter‐distance of GBPs, we demonstrate in this study a highly efficient SEM imaging technique that can unfold grain boundary in a two‐dimensional view. Compared to TEM, imaging with backscattered electrons in SEM (SEM‐BSE) is more advantageous for GBPs presentation and measurements. The major reason is that about 900 times more sampling area can be imaged with SEM from the same specimen for TEM observation, thus enabling frequent appearances of GBPs at normal top view perspective, a planar view best for GBPs quantitative analysis but not well‐documented. The acceleration tension of SEM for imaging was optimized at 10 kV with an information depth of around 330 nm. Research Highlights Scanning electron microscope (SEM) imaging using backscattered electrons is efficient for AA7075 grain boundary precipitate imaging. The precipitate size and inter‐distance can be more accurately measured with the perspective of normal top view under SEM than transmitted electron microscope.

show abstract

“…Addition of materials like boron carbide, Silicon carbide and graphite greatly enhances the tensile, flexural and hardness values of composites. [13][14][15][16] Hybrid composite reinforcements like TiC and MoS 2 provides better hardness and tribological properties. [17][18][19] Nano particles of Al 2 O 3 combined with strontium showed better tribological and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the mechanical, wear behaviour of copper matrix composite with 2V-Gr as reinforcement

Jabinth¹,

Selvakumar²

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

In the present study, copper along with secondary hybrid reinforcements like Vanadium (V) and Graphene-L (Gr-L) with various proportions like pure Cu, Cu-2V, Cu-2V-0.5Gr, Cu-2V-1Gr, Cu-2V-1.5Gr are added to evaluate the behaviour of Copper Matrix Composite. The evenly dispersion of heterogeneous Copper Matrix Composite is achieved by the economical stir casting process. The heterogeneous mixture with metallic materials is a promising strategy to improve the properties of CMC. The prepared specimen is subjected to various testing processes to test the properties like Tensile strength, hardness, Yield strength, Impact strength and wear behaviours. The grain formation of hybrid CMC is also studied using an optical microscope to see the relationship between strength and grain size. The characterization of hybrid CMC is done by X-ray diffraction, Fourier Transform Infrared Spectroscopy and Energy Dispersive X-ray Spectroscopy. Fractography is also done to investigate the debonding mechanism of heterogeneous composites. The wear behavior of the hybrid composite is examined by Pin-on-disc tribometer. The results obtained, shows that, there is a reduction in grain size with the increase in addition of vanadium and graphene-L. The decrease in grain size has directly contributed to the improvement of mechanical properties of CMC. There is also an enhancement in wear behavior such as improvement in co-efficient of friction and wear resistance with increase in hybrid composition. This paves a new strategy and acts as a reliable reinforcement to improve the behaviour of copper based metal matrix composites.

show abstract

Effects of in-process cryocooling on metallurgical and mechanical properties of friction stir processed Al7075 alloy

Cited by 34 publications

References 40 publications

Special Issue: Advance in Friction Stir Processed Materials

Special Issue: Advance in Friction Stir Processed Materials

An advantageous imaging perspective for quantitative evaluation of 7075 aluminum alloy grain boundary precipitates using scanning electron microscope

Enhancing the mechanical, wear behaviour of copper matrix composite with 2V-Gr as reinforcement

Contact Info

Product

Resources

About