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Development of ultrafine grained Al 7075 by cryogenic temperature large strain extrusion machining

  • Xiaolong Yin (a1), Yunyun Pi (a1), Di He (a1), Jiayang Zhang (a1) and Wenjun Deng (a1)...
  • Please note a correction has been issued for this article.

Abstract

Large strain extrusion machining (LSEM) emerges as an innovative severe plastic deformation method of fabricating ultrafine grained materials. However, substantial heat generated during LSEM would sacrifice the mechanical properties of materials. Cryogenic temperature (CT) LSEM is put forward to overcome this shortcoming. The Al 7075 was processed by cryogenic and room temperature (RT) LSEM to investigate their comparative effects on mechanical and microstructural properties. Results indicate that the chip morphology of CT LSEM is featured with better integrity. Grains are refined to less than 200 nm by CT LSEM. A more complicated microstructure with high dislocation density is observed in the CT LSEM specimens. The hardness of cryogenic and RT LSEM specimens increases with the compression ratio and reaches the highest values of 187HV and 170HV, respectively. Dislocation strengthening is the main contributor, accounting for the higher hardness of CT LSEM specimens.

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a)Address all correspondence to this author. e-mail: dengwj@scut.edu.cn

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b)

This article has been updated since original publication. A notice detailing this change has also been published at https://doi.org/10.1557/jmr.2018.383.

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1.Shamanian, M., Mostaan, H., Safari, M., and Szpunar, J.A.: Friction stir modification of GTA 7075-T6 Al alloy weld joints: EBSD study and microstructural evolutions. Arch. Civ. Mech. Eng. 17, 574 (2017).
2.Lee, W.S., Sue, W.C., Lin, C.F., and Wu, C.J.: The strain rate and temperature dependence of the dynamic impact properties of 7075 aluminum alloy. J. Mater. Process. Technol. 100, 116 (2000).
3.Panigrahi, S.K. and Jayaganthan, R.: Development of ultrafine grained high strength age hardenable al 7075 alloy by cryorolling. Mater. Des. 32, 3150 (2011).
4.Zhao, Y.H., Liao, X.Z., Jin, Z., Valiev, R.Z., and Zhu, Y.T.: Microstructures and mechanical properties of ultrafine grained 7075 al alloy processed by ECAP and their evolutions during annealing. Acta Mater. 52, 4589 (2004).
5.Fritsch, S., Scholze, M., and Wanger, M.F-X.: Cryogenic forming of AA7075 by equal-channel angular pressing. Mater. Werkst. 43, 561 (2012).
6.Deng, W.J., Xia, W., Li, C., and Tang, Y.: Formation of ultra-fine grained materials by machining and the characteristics of the deformation fields. J. Mater. Process. Technol. 209, 4521 (2009).
7.Li, Y.S., Tao, N.R., and Lu, K.: Microstructural evolution and nanostructure formation in copper during dynamic plastic deformation at cryogenic temperatures. Acta Mater. 56, 230 (2008).
8.Zhao, Y.H., Liao, X.Z., Cheng, S., Ma, E., and Zhu, Y.T.: Simultaneously increasing the ductility and strength of nanostructured alloys. Adv. Mater. 18, 2280 (2006).
9.Yu, H.L., Lu, C., Tieu, K., Li, H., Godbole, A., Liu, X., and Kong, C.: Enhanced materials performance of Al/Ti/Al laminate sheets subjected to cryogenic roll bonding. J. Mater. Res. 32, 3761 (2017).
10.Swaminathan, S., Shankar, M.R., Rao, B.C., Compton, W.D., Chandrasekar, S., King, A.H., and Trumble, K.H.: Severe plastic deformation (SPD) and nanostructured materials by machining. J. Mater. Sci. 42, 1529 (2007).
11.Deng, W.J., He, Y.T., Lin, P., Xia, W., and Tang, Y.: Investigation of the effect of rake angle on large strain extrusion machining. Mater. Manuf. Processes 29, 621 (2014).
12.Deng, W.J., Lin, P., Xie, Z.C., and Li, Q.: Analysis of large-strain extrusion machining with different chip compression ratios. J. Nanomater. 11, 5271 (2012).
13.Palaniappan, K., Murthy, H., and Rao, B.C.: Production of fine-grained foils by large strain extrusion-machining of textured Ti–6Al–4V. J. Mater. Res. 33, 108 (2018).
14.Iglesias, P., Bermúdez, M.D., Moscoso, W., and Chandrasekar, S.: Influence of processing parameters on wear resistance of nanostructured OFHC copper manufactured by large strain extrusion machining. Wear 268, 178 (2010).
15.Efe, M., Moscoso, W., Trumble, K.P., Compton, W.D., and Chandrasekar, S.: Mechanics of large strain extrusion machining and application to deformation processing of magnesium alloys. Acta Mater. 51, 2031 (2012).
16.Umbrello, D., Caruso, S., and Imbrogno, S.: Finite element modelling of microstructural changes in dry and cryogenic machining AISI 52100 steel. Mater. Sci. Technol. 32, 1062 (2016).
17.Atlati, S., Moufki, A., Nouari, M., and Haddag, B.: Interaction between the local tribological conditions at the tool–chip interface and the thermomechanical process in the primary shear zone when dry machining the aluminum alloy AA2024–T351. Tribol. Int. 105, 326 (2017).
18.Guo, Y.B. and Yen, D.W.: A FEM study on mechanisms of discontinuous chip formation in hard machining. J. Mater. Process. Technol. 155–156, 1350 (2004).
19.Ye, C., Suslov, S., Lin, D., and Liao, Y.: Cryogenic ultrahigh strain rate deformation induced hybrid nanotwinned microstructure for high strength and high ductility. J. Appl. Phys. 115, 213519 (2014).
20.Park, D.H., Choi, S.W., Kim, J.H., and Lee, J.M.: Cryogenic mechanical behavior of 5000- and 6000-series aluminum alloys: Issues on application to offshore plants. Cryogenics 68, 44 (2015).
21.Moscoso, W., Shankar, M.R., Mann, J.B., Compton, W.D., and Chandrasekar, S.: Bulk nanostructured materials by large strain extrusion machining. J. Mater. Res. 22, 201 (2007).
22.Pu, Z., Outeiro, J.C., and Batista, A.C.: Enhanced surface integrity of AZ31B Mg alloy by cryogenic machining towards improved functional performance of machined components. Int. J. Mach. Tool Manufact. 56, 17 (2012).
23.Abbasi-Baharanchi, M., Karimzadeh, F., and Enayati, M.H.: Mechanical and tribological behavior of severely plastic deformed Al6061 at cryogenic temperatures. Mater. Sci. Eng., A 683, 56 (2017).
24.Magalhães, D.C.C., Kliauga, A.M., Ferrante, M., and Sordi, V.L.: Plastic deformation of FCC alloys at cryogenic temperature: The effect of stacking-fault energy on microstructure and tensile behaviour. J. Mater. Sci. 52, 7466 (2017).
25.Wang, Y., Jiao, T., and Ma, E.: Dynamic processes for nanostructure development in Cu after severe cryogenic rolling deformation. Mater. Trans. 44, 1926 (2005).
26.Sarma, V.S., Jian, W.W., Wang, J., Conrad, H., and Zhu, Y.T.: Effect of rolling temperature on the evolution of defects and properties of an Al–Cu alloy. J. Mater. Sci. 45, 4846 (2010).
27.Panigrahi, S.K. and Jayaganthan, R.: Effect of annealing on thermal stability, precipitate evolution, and mechanical properties of cryorolled Al 7075 alloy. Metall. Mater. Trans. A 42, 3208 (2011).
28.Yu, H.L., Tieu, A.K., Lu, C., Liu, X.H., Godbole, A., and Kong, C.: Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment. Mater. Sci. Eng., A 568, 212 (2013).
29.Panigrahi, S.K. and Jayaganthan, R.: Development of ultrafine-grained Al 6063 alloy by cryorolling with the optimized initial heat treatment conditions. Mater. Des. 32, 2172 (2011).
30.Kim, W.J. and Sa, Y.K.: Micro-extrusion of ECAP processed magnesium alloy for production of high strength magnesium micro-gears. Scr. Mater. 54, 1391 (2006).
31.Rao, P.N., Singh, D., Brokmeier, H.G., and Jayaganthan, R.: Effect of ageing on tensile behavior of ultrafine grained Al 6061 alloy. Mater. Sci. Eng., A 641, 391 (2015).

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