预退火对Al-Pb和Al-Pb-Cu纳米相复合结构合金Pb相长大行为的影响
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摘要
利用X射线衍射仪和扫描电镜,研究预退火对机械合金化制备的Al-10%Pb和Al-10%Pb-4.5%Cu(质量分数)纳米相复合结构合金中Pb相长大行为的影响,此机械合金化制备的Al-10%Pb和Al-10%Pb-4.5%Cu合金应在873 K保温10 min后进行预退火。结果表明,预退火后的Al-10%Pb合金在823K退火时,Pb相发生了异常长大,且预退火可促进Pb相的异常长大,这与预退火促进基体Al的异常长大有关。预退火后的Al-10%Pb-4.5%Cu合金中Pb相的长大行为仍可用LSW理论描述,但其长大速率明显大于未预退火的Al-10%Pb-4.5%Cu合金中Pb相的长大速率。这是由预退火使Pb相的长大驱动力增加所引起的。
The effect of pre-annealing on the growth behavior of Pb phase in Al-10%Pb and Al-10%Pb-4.5%Cu nanocomposite alloys prepared by mechanical alloying was investigated by X-ray Diffraction(XRD) and Scanning Electron Microscopy(SEM). The as-milled Al-10%Pb and Al-10%Pb-4.5%Cu alloys were heated at 873 K for 10 minutes by pre-annealing. The results show that the abnormal growth of Pb phase in pre-annealed Al-10%Pb alloy is more obvious than that in un-annealed alloy when heated at 823 K. The pre-annealing makes the size difference of Al grains more obvious, which can promote the abnormal growth of Pb phase in pre-annealed Al-10%Pb alloy. The growth of Pb phase in pre-annealed Al-10%Pb-4.5%Cu alloys still follows the LSW theory. It has also been found that the growth rate of Pb phase for the pre-annealed Al-10%Pb-4.5%Cu alloy is greater than that for un-annealed alloy. This is mainly due to the change of driving force of the growth, which has shown an increase after the pre-annealing.
The effect of pre-annealing on the growth behavior of Pb phase in Al-10%Pb and Al-10%Pb-4.5%Cu nanocomposite alloys prepared by mechanical alloying was investigated by X-ray Diffraction(XRD) and Scanning Electron Microscopy(SEM). The as-milled Al-10%Pb and Al-10%Pb-4.5%Cu alloys were heated at 873 K for 10 minutes by pre-annealing. The results show that the abnormal growth of Pb phase in pre-annealed Al-10%Pb alloy is more obvious than that in un-annealed alloy when heated at 823 K. The pre-annealing makes the size difference of Al grains more obvious, which can promote the abnormal growth of Pb phase in pre-annealed Al-10%Pb alloy. The growth of Pb phase in pre-annealed Al-10%Pb-4.5%Cu alloys still follows the LSW theory. It has also been found that the growth rate of Pb phase for the pre-annealed Al-10%Pb-4.5%Cu alloy is greater than that for un-annealed alloy. This is mainly due to the change of driving force of the growth, which has shown an increase after the pre-annealing.
引文
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[3]LIU X,ZENG M Q,MA Y,et al.Wear behavior of Al-Sn alloys with different distribution of Sn dispersoids manipulated by mechanical alloying and sintering[J].Wear,2008,265:1857-1863.
[4]LIU X,ZENG M Q,MA Y,et al.Promoting the high load-carrying capability of Al-20wt%Sn bearing alloys through creating nanocomposite structure by mechanical alloying[J].Wear,2012,294-295:387-394.
[5]MAHON S W,SONG X,HOWSON M A,et al.GMR in a Cu90Co10 alloy produced by mechanical alloying[J].Materials Science Forum,1996,225-227:157-162.
[6]EBRAHIMI F,LI H Q.Grain growth in electrodeposited nanocrystalline fcc Ni-Fe alloys[J].Scripta Materialia,2006,55:263-266.
[7]HIBBARD G.D,AUST K T,ERB U.Thermal stability of electrodeposited nanocrystalline Ni-Co alloys[J].Materials Science and Engineering A,2006,433:195-202.
[8]HIBBARD G D,MCCREA J L,PALUMBO G,et al.An initial analysis of mechanisms leading to late stage abnormal grain growth in nanocrystalline Ni[J].Scripta Materialia,2002,47:83-87.
[9]LITSHTTZ I M,SLYOZOV V V.The kinetics of precipitation from supersaturated solid solutions[J].J Phys.Chem.Solids,1961,19(1/2):35-50.
[10]WAGNER C.Theorie de altering von Niederschlagen durch umlosen[J].Ber Bunsen-Ges Phys Chem,1961,65:581-591.
[11]吴志方,周,杨薇,等.机械合金化制备Al-10Pb纳米相复合结构的热稳定性[J].粉末冶金材料科学与工程,2014,19(6):881-886.WU Zhi-fang,ZHOU Yan,YANG Wei,et al.Thermal stability of Al-10Pb nanophase compostite structure prepared by mechanical alloying[J].Materials Science and Engineering of Powder Metallurgy,2014,19(6):881-886.
[12]ZHU M,OUYANG L Z,WU Z F,et al.The effect of Cu addition and milling contaminations on the microstructure evolution of ball milled Al-Pb alloy during sintering[J].Materials Science and Engineering A,2006,434:352-359.
[13]ZHU M,LIU X,WU Z F,et al.Heterogeneous coarsening of Pb phase and the effect of Cu addition on it in a nanophase composite of Al-10wt%Pb alloy prepared by mechanical alloying[J].Materials Science and Engineering A,2009,501:99-104.
[14]BENDER W,RATKE L.Ostwald ripening of liquid phase sintered Cu-Co dispersions at high volume fractions[J].Acta Mater,1998,46(4):1125-1133.
[15]BENDER W,RATKE L.Ostwald ripening of the matrix phase surrounding dispersoids[J].Z Metallkde,1998,89(10):666-671.
[16]LANGFORD J I.A rapid method for analysing the breadths of diffraction and spectral lines using the Vogit function[J].Journal of Applied Crystalline,1978,11:10-14.
[17]RIOS P R.Abnormal grain growth development from uniform grain size distribution[J].Acta Mater,1997,45(4):1785-1789.