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铝纳米晶的正电子湮没研究

李裕 罗江山 王柱 杨蒙生 邢丕峰 易勇 雷海乐

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铝纳米晶的正电子湮没研究

李裕, 罗江山, 王柱, 杨蒙生, 邢丕峰, 易勇, 雷海乐

Nanocrystalline aluminum studied by positron annihilation lifetime spectroscopy

Li Yu, Luo Jiang-Shan, Wang Zhu, Yang Meng-Sheng, Xing Pi-Feng, Yi Yong, Lei Hai-Le
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  • 采用自悬浮定向流-真空热压法, 在不同压强下制得铝纳米晶材料, 并利用X射线衍射(XRD)和正电子湮没寿命谱(PALS)分析手段对铝纳米晶的结构和微观缺陷进行表征. XRD分析表明: 所制备的铝纳米晶的晶粒度为48 nm. PALS分析表明: 铝纳米晶的微观缺陷主要为类空位以及空位团, 而微孔洞很少; 短寿命τ1, 中间寿命τ2以及其对应的强度I1, I2随压强变化而呈现阶段性变化; 压制压强(P)低于0.39 GPa时制得的纳米晶空位团随压强的增加而逐渐转变为类空位; 0.39 GPa ≤ P≤ 0.72 GPa 时, 各类缺陷发生消除; P≥ 0.72 GPa时, 各类缺陷进一步发生消除. 随压强的提高, 铝纳米晶的密度增加, 其显微硬度也明显增高.
    Aluminum nanoparticles with an average diameter of about 48 nm are compressed in a cemented-carbide mold under different pressures to produce nanocrystalline aluminum by the hot-pressing technology in a high vacuum condition. The X-ray diffraction and the positron annihilation lifetime spectroscopy (PALS) are used to characterize the microscopic structures of nanocrystalline aluminum. The PALS experimental results indicate that there are three types of defects in nanocrystalline aluminum, i.e., vacancy-like defects, vacancy clusters, and microvoids, which are corresponding to three lifetime components of positrons. The pressure for compaction has a great influence on the positron annihilating behavior. The vacancy clusters transform into the vacancy-like defects with increasing the pressure when it is below 0.39 GPa. The three types of defects tend to be rapidly eliminated in a pressure range from 0.39 GPa to 0.72 GPa. When pressure is above 0.72 GPa, the defects are further eliminated in nanocrystalline aluminum. The density and microhardness of nanocrystalline aluminum increase significantly with increasing the pressure for compaction.
    [1]

    Gleiter H 1989 Prog. Mater. Sci. 33 223

    [2]

    Schaefer H E, Wrschum R 1987 Phys. Lett. A 119 370

    [3]

    Qin X Y, Zhu J S, Zhou X Y, Wu X J 1994 Phys. Lett. A 193 335

    [4]

    Zeng X C 2012 M. S. Thesis ( Wuhan: Huazhong University of Science and Technology) (in Chinese) [曾小川 2012 硕士学位论文 (武汉: 华中科技大学)]

    [5]

    Schaefer H E, Wrschum R, Birringer R, Gleiter H 1988 Phys. Rev. B 38 9545

    [6]

    Qin X Y, Zhu J S, Zhang L D, Zhou X Y 1998 J. Phys. Cond. Matter 10 3075

    [7]

    Chu G, Luo J S, Liu W, Tang Y J, Lei H L, Yang S Y 2006 High Power Laser and Particle Beams 18 160 (in Chinese) [楚广, 罗江山, 刘伟, 唐永建, 雷海乐, 杨世源 2006 强激光与粒子束 18 160]

    [8]

    Zhang T, Qiu C, Zhang H J, Dai Y Q, Chen Z Q, Zhang H L, Lei H L 2010 J. Wuhan Univ. (Natural Science Edition) 6 3 (in Chinese) [章婷, 邱诚, 张宏俊, 戴益群, 陈志权, 张洪亮, 雷海乐 2010 武汉大学学报 (理学版) 6 3]

    [9]

    Zhou K, Li H, Pang J B, Wang Z 2012 Physica B 407 1219

    [10]

    Wrschum R, Scheytt M, Schaefer H E 1987 Phys. Stat. Solid. A 102 119

    [11]

    Qi N, Wang Y W, Wang D, Wang D D, Chen Z Q 2011 Acta Phys. Sin. 60 107805 (in Chinese) [祁宁, 王元为, 王栋, 王丹丹, 陈志权 2011 物理学报 60 107805]

    [12]

    Zhou K, Li H, Wang Z 2013 Chin. Phys. Lett. 30 057804

    [13]

    Chen Z Y, Chen Z Q, Pan R K, Wang S J 2013 Chin. Phys. Lett. 30 027804

    [14]

    Fluss M J, Smedskjaer L C, Chason M K, Legnini D G, Siegel R W 1978 Phys. Rev. B 17 3444

    [15]

    Soininen E, Huomo H, Huttunen P A, Mäkinen J, Vehanen A, Hautojärvi P 1990 Phys. Rev. B 41 6227

    [16]

    Puska M J, Nieminen R M 1983 J. Phys. F 13 333

    [17]

    Li D X, Ping D H, Ye H Q, Qin X Y, Wu X J 1993 Mater. Lett. 18 29

    [18]

    Čížek J, Procházka I, Cieslar M, Kužel R, Kuriplach J, Chmelík F, Islamgaliev R K 2002 Phys. Rev. B 65 094106

    [19]

    Mascher P, Dannefaer S, Kerr D 1989 Phys. Rev. B 40 11764

    [20]

    Dupasquier A, Mills Jr A P 1995 Positron Spectroscopy of Solids (Amsterdam: IOS Press) pp505-522

    [21]

    Niemine R M, Laakkonen J 1979 Appl. Phys. 20 181

  • [1]

    Gleiter H 1989 Prog. Mater. Sci. 33 223

    [2]

    Schaefer H E, Wrschum R 1987 Phys. Lett. A 119 370

    [3]

    Qin X Y, Zhu J S, Zhou X Y, Wu X J 1994 Phys. Lett. A 193 335

    [4]

    Zeng X C 2012 M. S. Thesis ( Wuhan: Huazhong University of Science and Technology) (in Chinese) [曾小川 2012 硕士学位论文 (武汉: 华中科技大学)]

    [5]

    Schaefer H E, Wrschum R, Birringer R, Gleiter H 1988 Phys. Rev. B 38 9545

    [6]

    Qin X Y, Zhu J S, Zhang L D, Zhou X Y 1998 J. Phys. Cond. Matter 10 3075

    [7]

    Chu G, Luo J S, Liu W, Tang Y J, Lei H L, Yang S Y 2006 High Power Laser and Particle Beams 18 160 (in Chinese) [楚广, 罗江山, 刘伟, 唐永建, 雷海乐, 杨世源 2006 强激光与粒子束 18 160]

    [8]

    Zhang T, Qiu C, Zhang H J, Dai Y Q, Chen Z Q, Zhang H L, Lei H L 2010 J. Wuhan Univ. (Natural Science Edition) 6 3 (in Chinese) [章婷, 邱诚, 张宏俊, 戴益群, 陈志权, 张洪亮, 雷海乐 2010 武汉大学学报 (理学版) 6 3]

    [9]

    Zhou K, Li H, Pang J B, Wang Z 2012 Physica B 407 1219

    [10]

    Wrschum R, Scheytt M, Schaefer H E 1987 Phys. Stat. Solid. A 102 119

    [11]

    Qi N, Wang Y W, Wang D, Wang D D, Chen Z Q 2011 Acta Phys. Sin. 60 107805 (in Chinese) [祁宁, 王元为, 王栋, 王丹丹, 陈志权 2011 物理学报 60 107805]

    [12]

    Zhou K, Li H, Wang Z 2013 Chin. Phys. Lett. 30 057804

    [13]

    Chen Z Y, Chen Z Q, Pan R K, Wang S J 2013 Chin. Phys. Lett. 30 027804

    [14]

    Fluss M J, Smedskjaer L C, Chason M K, Legnini D G, Siegel R W 1978 Phys. Rev. B 17 3444

    [15]

    Soininen E, Huomo H, Huttunen P A, Mäkinen J, Vehanen A, Hautojärvi P 1990 Phys. Rev. B 41 6227

    [16]

    Puska M J, Nieminen R M 1983 J. Phys. F 13 333

    [17]

    Li D X, Ping D H, Ye H Q, Qin X Y, Wu X J 1993 Mater. Lett. 18 29

    [18]

    Čížek J, Procházka I, Cieslar M, Kužel R, Kuriplach J, Chmelík F, Islamgaliev R K 2002 Phys. Rev. B 65 094106

    [19]

    Mascher P, Dannefaer S, Kerr D 1989 Phys. Rev. B 40 11764

    [20]

    Dupasquier A, Mills Jr A P 1995 Positron Spectroscopy of Solids (Amsterdam: IOS Press) pp505-522

    [21]

    Niemine R M, Laakkonen J 1979 Appl. Phys. 20 181

计量
  • 文章访问数:  1868
  • PDF下载量:  338
  • 被引次数: 0
出版历程
  • 收稿日期:  2014-06-26
  • 修回日期:  2014-08-16
  • 刊出日期:  2014-12-05

铝纳米晶的正电子湮没研究

  • 1. 中国工程物理研究院激光聚变研究中心, 绵阳 621900;
  • 2. 西南科技大学材料科学与工程学院, 绵阳 621010;
  • 3. 武汉大学物理科学与技术学院, 武汉 430070

摘要: 采用自悬浮定向流-真空热压法, 在不同压强下制得铝纳米晶材料, 并利用X射线衍射(XRD)和正电子湮没寿命谱(PALS)分析手段对铝纳米晶的结构和微观缺陷进行表征. XRD分析表明: 所制备的铝纳米晶的晶粒度为48 nm. PALS分析表明: 铝纳米晶的微观缺陷主要为类空位以及空位团, 而微孔洞很少; 短寿命τ1, 中间寿命τ2以及其对应的强度I1, I2随压强变化而呈现阶段性变化; 压制压强(P)低于0.39 GPa时制得的纳米晶空位团随压强的增加而逐渐转变为类空位; 0.39 GPa ≤ P≤ 0.72 GPa 时, 各类缺陷发生消除; P≥ 0.72 GPa时, 各类缺陷进一步发生消除. 随压强的提高, 铝纳米晶的密度增加, 其显微硬度也明显增高.

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