温度与保温时间对半固态粉末轧制AA2024带材性能与显微组织的影响
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摘要
采用半固态粉末轧制法制备2024铝合金带材,研究粉末加热温度和保温时间对轧制力、带材的相对密度及显微组织的影响。结果表明:2024铝合金带材的相对密度随粉末温度升高而增大,随保温时间延长而提高。粉末在585℃保温40 min后轧制,可获得形貌规整、无表观缺陷且晶粒细小均匀的等轴晶带材,带材相对密度达到93.28%。半固态粉末轧制力仅为室温下固态粉末轧制力的33.5%。半固态粉末轧制带材组织内仍存在少量孔隙,进一步热轧后可达到近全致密,显微硬度提高77.8%。因此,半固态粉末轧制对于缩短工艺流程,减小轧制力,制备高致密度的2024铝合金带材具有明显的优势。
Semi-solid powder rolling was used to prepare 2024 aluminum alloy strips. The effects of holding temperature and time of powder on rolling force, relative density and microstructure evolution were studied. The results showed that:relative density in creasing with the temperature raising and the holding time prolonging of the powder. The strips with integrate shape, no obvious defects and fine equiaxed grains can be obtained by rolling the 2024 aluminum alloy powder after heat-treated at 585 ℃ for 40 min, resulting in a relative density of 93.28%. Compared with that of solid powder rolling, rolling force of semi-solid powder rolling can decrease to 33.5%. Moreover there is still a small amount of porosity in the microstructures of the semi-solid powder rolled strips, hot rolling are adopted to prepare a full dense strip,and micro-hardness also can increase by 77.8%. Therefore, semi-solid powder rolling has advantages such as shortening the process, reducing the rolling force, and preparing a highly dense 2024 aluminum alloy strips.
Semi-solid powder rolling was used to prepare 2024 aluminum alloy strips. The effects of holding temperature and time of powder on rolling force, relative density and microstructure evolution were studied. The results showed that:relative density in creasing with the temperature raising and the holding time prolonging of the powder. The strips with integrate shape, no obvious defects and fine equiaxed grains can be obtained by rolling the 2024 aluminum alloy powder after heat-treated at 585 ℃ for 40 min, resulting in a relative density of 93.28%. Compared with that of solid powder rolling, rolling force of semi-solid powder rolling can decrease to 33.5%. Moreover there is still a small amount of porosity in the microstructures of the semi-solid powder rolled strips, hot rolling are adopted to prepare a full dense strip,and micro-hardness also can increase by 77.8%. Therefore, semi-solid powder rolling has advantages such as shortening the process, reducing the rolling force, and preparing a highly dense 2024 aluminum alloy strips.
引文
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[2]JIANG H,HE X,QU X,et al.Preparation of AZ91alloy by powder metallurgy method[J].Transactions of Nonferrous Metals Society of China,2006,16(S3):S1855-S1858.
[3]GU J,ZHANG X,QIU Y,et al.Damping behaviors of magnesium matrix composites Reinforced with Cu-coated and uncoated Si C particulates[J].Composites Science and Technology,2005,65(11/12):1736-1742.
[4]NISHIYAMA K,MATSUI R,IKEDA Y,et al.Damping properties of a sintered Mg-Cu-Mn alloy[J].Journal of Alloys and Compounds,2003,355(1/2):22-25.
[5]DUBE R K.Metal strip via roll compaction and related powder metallurgy routes[J].International Materials Reviews,1990,35(1):253-292.
[6]DESHMUKH A R,SUNDARARAJAN T,DUBE R K,et al.Analysis of cold densification rolling of a sintered porous metal strip[J].Journal of Materials,1998,84(1/3):56-72.
[7]SPENCER D B,MEHRABIAN R,FLEMINGS M C.Theological behavior of Sn-15%Pt in the crystallization range[J].Metallurgical Transactions,1972,3(7):1925-1932.
[8]FLEMINGS M C.Behavior of metal alloys in the semi-solid state[J].Metallurgical Transactions B,1991,22(3):269-293.
[9]KAPRANOS P,WARD P J,ATKINSON H V,et al.Near net shaping by semi-solid metal processing[J].Materials and Design,2000,21(4):387-394.
[10]张奎,刘国钧,张景新,等.铝合金半固态加工技术应用[J].中国有色金属学报,2000,10(1):135-140.ZHANG Kui,LIU Guo-jun,ZHANG Jing-xin,et al.Application on semi-solid processing of aluminum alloy[J].The Chinese Journal of Nonferrous Metals,2000,10(1):135-140.
[11]WEN C E,YASUE K,YAMADA Y.Fabrication of Ti Al by blended elemental powder semisolid forming[J].Journal of Materials Science,2001,36(7):1741-1745.
[12]YOUNG R M K,CLYNE T W.A powder-based approach to semisolid processing of metals for fabrication of die-castings andcomposites[J].Journal of Materials Science,1986,21:1057-1069
[13]ZU L,LUO S.Study on the powder mixing and semi-solid extrusion forming process of Si Cp/2024Al composites[J].Journal of Materials Processing Technology,2001,114(3):189-193.
[14]WU Y,KIM G Y,ANDERSON I,et al.Fabrication of Al6061composite with high Si C particle loading by semi-solid powder processing[J].Acta Materialia,2010,58(13):4398-4405.
[15]WU Y,KIM G,RUSSELL A M.Effects of mechanical alloying on an Al6061–CNT composite fabricated by semi-solid powder processing[J].Materials Science and Engineering:A,2012,538:164-172.
[16]MANN R E D,HEXEMER R L,DONALDSON I W,et al.Hot deformation of an Al-Cu-Mg powder metallurgy alloy[J].Materials Science and Engineering:A,2011,528(16/17):5476-5483.
[17]SCHAFFER G B,SERCOMBE T B,LUMLEY R N.Liquid phase sintering of aluminum alloys[J].Materials Chemistry and Physics,2001,67(1):85-91.
[18]王兴庆,吕海波.粉末冶金法制取Fe-Al金属间化合物的研究[J].上海大学学报:自然科学版,2006,6(6):511-515.WANG Xing-qing,LüHai-bo.Research on making Fe3Al intermetallicby powder metallurgy[J].Shanghai University:Natural Science Edition,2006,6(6):511-515
[19]乐启炽,张新建,崔建忠,等.AZ91D镁合金近液相线铸造半固态坯料的部分重熔[J].金属学报,2002,38(12):1266-1272.LE Qi-chi,ZHANG Xin-jian,CUI Jian-zhong,et al.Remelting of SSM ingot by the prepared near-liquids casting of AZ91D magnesium alloy[J].Acta Metallurgica Sinica,2002,38(12):1266-1272.
[20]YANG H L,ZHANG Z L,OHNAKA I.Structure evolution and compressive behavior of semi-solid Al-Si hypoeutectic alloy with re-melting heat treatment[J].Journal of Materials Processing Technology,2004,151(1/3):155-164.
[21]陈飞凤,严红革,陈振华,等.外框限制轧制工艺在喷射沉积板坯加工中的应用[J].机械工程材料,2007,31(2):19-22.CHEN Fei-feng,YAN Hong-ge,CHEN Zhen-hua,et al.Application of frame-pack rolling technology to process of spray deposition sheets[J].Materials for Mechanical Engineering,2007,31(2):19-22.