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- 저자 : Sh. Mirdamadi (검색결과 1 건)
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S. Nouri,S. Sahmani,M. Hadavi,Sh. Mirdamadi 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.8
Due to having low density as well as high specific modulus and fatigue toughness, Al–Li alloys have been targeted as anadvanced material for using in aerospace applications. In the current investigation, a new heat treatment method namelyas directional quenching process is proposed to improve the mechanical properties of the Al–Li 8090 alloy, the results ofwhich are compared with those of T6 and T8 aging heat treatment techniques. For this purpose, aging process at 170 °C isconducted in all of the three heat treatment methods, but the solutionizing treatment and quenching are performed alonga specific direction in the introduced directional quenching method. The mechanical properties and fracography of crosssectionalfracture pattern of the heat treated samples are studied corresponding to the various heat treatments. Based on theobtained results, it is found that in comparison with the two conventional T6 and T8 heat treatment methods, the proposeddirectional quenching technique has the capability to increase simultaneously both of the ductility and strength of Al–Li 8090alloy. Also, according to the performed finite element based thermal stress analysis, it is observed that a uniform distributionand high volume fraction of strengthening δ′ (Al3Li) precipitates are acquired via the directional quenching technique.
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