[논문](Mg + Al2Ca)로 개량된 AA7075 합금의 미세조직, 기계적 특성, 그리고 고주기 피로 특성에 미치는 T6 및 T73 열처리의 효과

황유진; 김관영; 김규식; 김세광; 윤영옥; 이기안

doi:10.5228/kstp.2021.30.1.5

(Mg + Al2Ca)로 개량된 AA7075 합금의 미세조직, 기계적 특성, 그리고 고주기 피로 특성에 미치는 T6 및 T73 열처리의 효과
Effect of T6 and T73 Heat Treatments on Microstructure, Mechanical Responses and High Cycle Fatigue Properties of AA7075 Alloy Modified with Mg and Al2Ca 원문보기

소성가공 = Transactions of materials processing : Journal of the Korean society for technology of plastics, v.30 no.1, 2021년, pp.5 - 15

황유진 (인하대학교 신소재공학과) , 김관영 (안동대학교 재료공학과) , 김규식 (인하대학교 신소재공학과) , 김세광 (한국생산기술연구원) , 윤영옥 (한국생산기술연구원) , 이기안 (인하대학교 신소재공학과)

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The effects of heat treatments (T6 and T73) on the microstructure, mechanical properties, and high cycle fatigue behavior of modified AA7075 alloys were investigated. A modified 7075 alloy was manufactured using modified-Mg (Mg-Al2Ca) instead of the conventional element Mg. Based on the microstructure, the average grain size was 4.5 ㎛ (T6) and 5.2 ㎛ (T73). Regardless of heat treatment, the modified AA7075 alloys consisted of Al matrix containing homogeneously distributed Al2CuMg and MgZn2 phases with reduced Fe-intermetallic compound. Room temperature tensile tests showed that the properties of modified 7075-T6 (Y.S.: 622MPa, T.S: 675MPa, elongation: 15.4%) were superior to those of T73 alloy (Y.S.: 492MPa, T.S: 548MPa, elongation: 12.8%). Experimental data show that the fatigue life of T6 was 400 MPa, about 64% of its yield strength. However, the fatigue life of T73 alloy was 330 MPa and 67%. Irrespective of the stress level, all crack initiation points were located on the specimen surface, and no inclusions acting as stress concentrators were seen. Superior mechanical properties and high cycle fatigue behavior of modified AA7075-T6 alloy are attributed to the fine grains and homogeneous distribution of small second phases such as MgZn2 and Al2CuMg, in addition to reduced Fe-intermetallic compounds.

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표/그림 (14)

표 Table 1 Chemical compositions of modified AA7075 alloy used in this study (in wt.%)
그림 Fig. 1 Tensile and high-cycle fatigue test specimens according to ASTM E8M
그림 Fig. 2 Optical microscope images of (a) modified AA7075-T6 and (b) modified AA7075-T73 alloys
그림 Fig. 3 XRD analysis results of modified AA7075-T6 and modified AA7075-T73 alloys
그림 Fig. 4 SEM images showing microstructures of modified AA7075-T6 and AA7075-T73 alloys
그림 Fig. 5 EPMA analysis results of (a) modified AA7075-T6 and (b) modifiedAA7075-T73 alloys
표 Table 2 Results of chemical compositions by energy dispersion spectra at red, orange, and blue circles in the Figure 4 (in wt.%)
그림 Fig. 6 (a) Room temperature engineering stressengineering strain curves and (b) true stress and work hardening rate-true strain curves of modified AA7075-T6 and modified AA7075-T73 alloys
표 Table 3 Room temperature hardness and tensile properties of modified AA7075-T6 and modified AA7075-T73 alloys
그림 Fig. 7 Graph of ultimate tensile strength and elongation compared to several literatures [22-29]
$Fig. 8 Tensile fracture surfaces of (a) modified AA7075-T6 and (b) modified AA7075-T73 alloys$ 그림 Fig. 8 Tensile fracture surfaces of (a) modified AA7075-T6 and (b) modified AA7075-T73 alloys
그림 Fig. 9 (a) The fatigue maximum stress-number of cycles to failure curves and (b) normalized max stress-number of cycles to failure curves of modified7075 alloys
$Fig. 10 Fatigue fracture surface images and high-magnification images of fatigue crack starting points; (a) 420MPa, (b) 490MPa of modified 7075-T6 alloy and (c) 420MPa, (d) 490MPa of modified 7075-T73 allo$ 그림 Fig. 10 Fatigue fracture surface images and high-magnification images of fatigue crack starting points; (a) 420MPa, (b) 490MPa of modified 7075-T6 alloy and (c) 420MPa, (d) 490MPa of modified 7075-T73 allo
$Fig 11. Fatigue fracture surfaces and high magnification images of fatigue crack propagation region and cross section images of fatigue fracture specimens; (a), (c) modified AA7075-T6 and (b), (d) modified AA7075 T73 alloys$ 그림 Fig 11. Fatigue fracture surfaces and high magnification images of fatigue crack propagation region and cross section images of fatigue fracture specimens; (a), (c) modified AA7075-T6 and (b), (d) modified AA7075 T73 alloys

참고문헌 (32)

J. S. Park, S. Y. Sung, B. S. Han, C. Y. Jung, K. A. Lee, 2009, High temperature fatigue deformation behavior of automotive heat resistant aluminum alloys. Kor. J Met. Mater., Vol. 48, pp. 28-38. http://doi.org/10.3365/KJMM.2010.48.01.028

상세보기
W. S. Miller, L. Zhuang, J. Bottema, A. J. Wittebrood, P. D. Smet, A. Hazler, A. Vieregge, 2000, Recent development in aluminium alloys for the automotive industry, Mater. Sci. Res. Eng. Vol. 280, pp. 37-49. https://doi.org/10.1016/S0921-5093(99)00653-X

상세보기
S. H. Kim, K. S. Kim, S. K. Kim, Y. O. Yoon, K. S. Cho, K. A. Lee, 2013, Microstructure and mechanical properties of Eco2024-T3 aluminum alloy. Adv Mater, Vol. 602-604, pp. 623-626. https://doi.org/10.4028/www.scientific.net/AMR.602-604.623

상세보기
G. Y. Kim, K. S. Kim, J. C. Park, S. K. Kim, Y. O. Yoon and K. A. Lee, High cycle fatigue and fatigue crack propagation behaviors of modified A7075-T73 alloy, 2013, Korea J. Met. Mater. Vol. 52, No. 4, pp. 283-291. http://doi.org/10.3365/KJMM.2014.52.4.283

상세보기
J. H. Seo, H. K. Lim, S. K. Kim, 2010, Microstructures and mechanical properties of diecast 0.7% CaO added Modified-Mg parts, Korea Found. Soc., Vol. 30, pp. 224-230. https://doi.org/10.5228/KSTP.2017.26.5.306

원문보기 상세보기
D. L. DuQuesnay, P. R. Underhill, H. J. Britt, 2003, Fatigue crack growth from corrosion damage in 7075-T6511 aluminium alloy under aircraft loading. Int. J. Fatigue, Vol. 25, No. 5, pp. 371-377. https://doi.org/10.1016/S0142-1123(02)00168-8

상세보기
T. Zhao, Y. Jiang, 2008, Fatigue of 7075-T651 aluminum alloy. Int. J. Fatigue, Vol. 30, No. 5, pp. 834-849. https://doi.org/10.1016/j.ijfatigue.2007.07.005

상세보기
Y. Xue, H. E. Kadiri, M. F. Horstemeyer, J. B. Jordon, H. Weiland, 2007, Micromechanisms of multistage fatigue crack growth in a high-strength aluminum alloy. Acta Mater., Vol. 55, pp. 1975-1984. https://doi.org/10.1016/j.actamat.2006.11.009

상세보기
K. S. Al-Rubaie, M. A. Del Grand, D. N. Travessa, K. R. Cardoso, 2007, Effect of pre-strain on the fatigue life of 7050-T7451 aluminium alloy, Mater. Sci. Eng. A, Vol. 464, pp. 141-150. https://doi.org/10.1016/j.msea.2007.02.024

상세보기
S. Lavenstein, Y. Gu, D. Madisetti, J. A. El-Awady, 2020, The heterogeneity of persistent slip band nucleation and evolution in metals at the micrometer scale, Science, Vol. 370, No. 6513, pp. eabb2690. http://doi.org/10.1126/science.abb2690

상세보기
P. K. Domalavage, J. N. Grant, Y. Gefen, 2007, Structure and properties of rapidly solidified 7075 P/M aluminum alloy modified with nickel and zirconium, Metall Trans A, Vol. 14, pp. 1599-1606. https://doi.org/10.1007/BF02654387

상세보기
P. Das, R. Jayaganhan, T. Chowdhury, I. V. Singh, 2011, Fatigue behavior and crack growth rate of cryorolled Al 7075 alloy, Mater. Sci. Eng. A, Vol. 528, pp. 7124-7132. https://doi.org/10.1016/j.msea.2011.05.021

상세보기
Y. K. Kim, M. J. Kim, S. K. Kim, Y. O. Yoon, K. A. Lee, 2017, Microstructure, tensile strength, and high cycle fatigue properties of Mg+Al2Ca added ADC12 (Al-SiCu) alloy, Trans. Mater. Process., Vol. 26, No. 5, pp. 306-313. http://doi.org/10.5228/KSTP.2017.26.5.306

원문보기 상세보기
C. E. Campbell, L. A. Bendersky, W. J. Boettinger, R. Ivester, 2006, Microstructureal characterization of Al7075-T6 chips and work pieces probused by high-speed machining, Mater. Sci. Eng. A, Vol. 430, pp. 15-26. https://doi.org/10.1016/j.msea.2006.04.122

상세보기
T. J. Harrison, B. R. Crawford, M. Janardhana, G. Clark, 2011, Differing microstructural properties of 7075-T6 sheet and 7075-T651 extruded aluminium alloy, Procedia Eng. Vol. 10, pp. 3117-3121. https://doi.org/10.1016/j.proeng.2011.04.516

상세보기
Y. M. Kim, Y. C. Lee, Y. H. Park, 2011, Effect of Ca additions on mechanical properties of Mg-4Al-2Sn-xCa die-casting alloys, Korea Foundry Soc., Vol. 31, pp. 293-301. http://doi.org/10.7777/jkfs.2011.31.5.293

원문보기 상세보기
H. W. Park, D. H. Kim, S. Y. Shim, H. K. Kim, B. H. Seong, C. O. Choi, S. G. Lim, 2011, The effect of Ca adiition on the grain growth inhibition during reheating process of Al-Zn-Mg Al alloys for thixe-xtrustion. Korea Foundry Soc., Vol. 31, pp. 347-353. https://doi.org/10.7777/jkfs.2011.31.6.347

원문보기 상세보기
A. D. Isadare, B. Aremo, M. O. Adeoye, O. J. Olawale, M. D. Shittu, 2013, Effect of heat treatment on some mechanical properties of 7075 aluminium alloy, Mater. Res., Vol. 16, No. 1, pp. 190-194. http://doi.org/ 10.1590/S1516-14392012005000167

상세보기
H. G. Jian, F. Jiang, K. Wen, L. Jiang, H. F. Huang, L. L. WEI, 2009, Fatigue fracture of high-strength Al-Zn-Cu alloy, Trans. Nonferrous Met. Soc., Vol. 19, pp. 1031-1036. https://doi.org/10.1016/S1003-6326(08)60402-1

상세보기
J. F. Li, Z. W. Peng, C. X. Li, Z. Q. Jia, W. J. Chen, Z. Q. Zheng, 2008, Mechanical properties, corrosion behaviors and microstructures of 7075 aluminium alloy with various aging treatments, Trans. Nonferrous Met. Soc. China, Vol. 18, No. 4, pp. 755-762. https://doi.org/10.1016/S1003-6326(08)60130-2

상세보기
G. L. Huang, D. K. Matlock, G. Krauss, 1989, Martensite formation, strain rate sensitivity, and deformation behavior of type 304 stainless steel sheet. Metall. Trans. A, Vol. 20, No. 7, pp. 1239-1246. https://doi.org/10.1007/BF02647406

상세보기
R.H. Oskouei, R.N. Ibrahim, 2011, Restoring the tensile properties of PVD-TiN coated Al 7075-T6 using a post heat treatment, Surf. Coat. Tech., Vol. 15, No. 25, pp. 3967-3973. https://doi.org/10.1016/j.surfcoat.2011.02.041

상세보기
K. Mohan, J. A. Suresh, Palaniappan Ramu and R. Jayaganthan, 2016, Microstructure and Mechanical Behavior of Al 7075-T6 Subjected to Shallow Cryogenic Treatment, J. Mater. Eng. Perf., Vol. 25, pp. 2185-2194. https://doi.org/10.1007/s11665-016-2052-1

상세보기
P. S. Prevey, J. T. Cammett, 2004, The influence of surface enhancement by low plasticity burnishing on the corrosion fatigue performance of AA7075-T6, Int. J. Fatigue, Vol. 26, No. 9, pp. 975-982. https://doi.org/10.1016/j.ijfatigue.2004.01.010

상세보기
L.R. Krishna, Y. Madhavi, T. Sahithi, D.S. Rao, V.S. Ijeri, O. Prakash, S.P. Gaydos, 2019, Enhancing the high cycle fatigue life of high strength aluminum alloys for aerospace applications, Fatigue Fract. Eng. Mater. Struct. Vol. 42, No. 3, pp. 698-709. https://doi.org/10.1111/ffe.12944

상세보기
Y. Yang, D.H. Li, H.G. Zheng, X.M. Li, F. Jiang, 2009, Self-organization behaviors of shear bands in 7075 T73 and annealed aluminum alloy, Mater. Sci. Eng. A, Vol. 527, No. 1-2, pp. 344-354. https://doi.org/10.1016/j.msea.2009.08.032

상세보기
I.M. AL-Sudani, S.A. Al-Rabii, D.S. Al-Fattal, 2020, The effects of anodizing process on the corrosion rate and fatigue life of aluminum alloy 7075-T73, Eng. Tech. J., Vol. 38, No. 1A, pp. 34-42. https://doi.org/10.30684/etj.v38i1A.1594
B. P. Rairand, B. A. Wilcox, W. J. Gallagher, D. N. Williams, 1972, Laser shock-induced microstructural and mechanical property changes in 7075 aluminum, J. Appl. Phys., Vol. 43, No. 9, pp. 3893-3895. https://doi.org/10.1063/1.1661837

상세보기
T. S. Shih, T. H. Lee, Y. J. Jhou, 2014, The effects of anodization treatment on the microstructure and fatigue behavior of 7075-T76 aluminum alloy, Mater. Trans., Vol. 55, pp. 1280-1285. http://doi.org/10.2320/matertrans.M2014121

상세보기
T. Gao, Z. Sun, H. Xue, D. Retraint, 2020, Effect of surface mechanical attrition treatment on high cycle and very high cycle fatigue of a 7075-T6 aluminium alloy, Int. J. Fatigue, 139 105798-105811. https://doi.org/10.1016/j.ijfatigue.2020.105798

상세보기
R. H. Oskouei, R. N. Ibrahim, 2011, The effect of a heat treatment on improving the fatigue properties of aluminium alloy 7075-T6 coated with TiN by PVD, Proced. Eng., Vol. 10, pp. 1936-1942. http://doi.org/10.1016/j.proeng.2011.04.321

상세보기
T. P. Savas, J. C. Earthman, 2014, Fatigue crack nucleation studies on sulfuric acid anodized 7075-T73 aluminum, J. Mater. Eng. Perform., Vol. 23, No. 6, pp. 2131-2138. https://doi.org/10.1007/s11665-014-1000-1

상세보기

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