Processing math: 100%
DONG Bingshun, WANG Haikuo, TONG Feifei, HOU Zhiqiang, LI Zhen, LIU Tong, ZANG Jinhao, YANG Xigui. Fabrication of Submicron Tetragonal Polycrystalline ZrO2 by the Transformation of Micro Monoclinic ZrO2 under High Pressure[J]. Chinese Journal of High Pressure Physics, 2019, 33(2): 020104. doi: 10.11858/gywlxb.20190709
Citation: WANG Yuntian, ZENG Xiangguo, CHEN Huayan, YANG Xin, WANG Fang, QI Zhongpeng. Numerical Simulation of Spalling Process of Tantalum Target under Impacts[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024203. doi: 10.11858/gywlxb.20200634

Numerical Simulation of Spalling Process of Tantalum Target under Impacts

doi: 10.11858/gywlxb.20200634
  • Received Date: 06 Nov 2020
  • Rev Recd Date: 02 Dec 2020
  • In this paper, the spallation characteristics of tantalum (Ta) under plate-impact loading are studied through numerical simulation. The feasibility and reliability of the Lagrange and smooth particle hydrodynamics (SPH) methods and several constitutive models (the Johnson-Cook, Steinberg-Cochran-Guinan and Zerilli-Armstrong model) are discussed. Comparison between the simulation results with experimental data, it is found that using the SPH method combined with the Steinberg-Cochran-Guinan constitutive model could produce the best consistency in the strain rate range from 2.31 × 104 s−1 to 5.40 × 104 s−1 for Ta. In addition, by changing the impact velocity and the thickness of the flyer, the free surface velocity curves under different strain rates are obtained, and the spalling characteristics under different strain rates are calculated and discussed. Characteristic parameters of spallation are calculated by using the free surface velocity data. The results have shown that the spalling strength of Ta increases with the strain rate, and is approximately linear in the logarithmic coordinate. Several computation methods of spall strength are considered in this work, and the difference between the results obtained by different methods are within the range of 8%. On the other side of the spectrum, the bounce rate of the free surface velocity increases with increasing strain rate. Finally, the physical meaning of the characteristic parameters in the free surface velocity curve is also discussed.

     

  • 晶粒尺寸对多晶材料的力学性能具有很大的影响。霍尔-佩奇效应[12]指出,纳米/亚微米多晶材料具有更高的硬度。该理论已在超高压制备的纳米立方氮化硼[3]、亚微米立方氮化硼[4]、纳米孪晶立方氮化硼[56]、纳米多晶金刚石[78]、纳米孪晶金刚石[9]等多晶材料中得到应用。现有的亚微米/纳米多晶陶瓷块体材料多以纳米粉末为初始材料,在常压和低压(低于1 GPa)环境下[1013]烧结制备。纳米粉末的表面能高,易团聚,在常压下由高温主导的烧结过程中通常会长大而失去纳米材料的特性[1415],难以获得细晶结构的多晶陶瓷块体材料。此外,单分散纳米粉末的制备工艺复杂,在技术上存在一定的困难。因此,以纳米粉末为初始材料制备细晶结构的多晶陶瓷块体材料仍然是一个挑战。

    压力(强)可以缩小原子间距、改变物质的电子轨道和键合方式,是决定物质存在状态及改变物质性质的基本热力学要素[16]。高压和相变相结合逐渐发展成为一种制备纳米/亚微米多晶陶瓷材料的有效方法[1723]。高压可以抑制原子的长程扩散进而抑制晶粒长大,利用高压相变合成多晶材料的过程中新相具有更高的成核率[17, 20],并且在高压环境下晶体具有更慢的生长速率;陶瓷材料在特定的热力学条件下一般会发生相变(晶体结构变化),相变是一个“推陈出新”的过程,形成新相的晶粒尺寸与初始材料的晶粒尺寸无必然联系:因此,采用高压相变法可以获得小于初始粉末晶粒尺寸的多晶块体材料。Irifune等[7]利用高压相变方法,将多晶石墨直接转化成晶粒尺寸为10~20 nm的纳米多晶金刚石(Nano Polycrystalline Diamond, NPD),努普硬度达120~140 GPa。王海阔等[8]以晶粒尺寸 10 μm的石墨为初始材料,合成出平均晶粒尺寸为20 nm、耐磨性和热稳定性优异的NPD。目前,以大颗粒粉晶(大单晶或微米晶)为初始材料、通过高压相变制备的细晶粒多晶陶瓷块体以超强共价键的超硬材料为主,本研究探索以微米晶单斜相ZrO2为初始材料,利用高压相变法制备细晶粒四方相多晶ZrO2块体材料,试图将微米晶初始材料结合高压相变制备细晶粒多晶块体的方法引入陶瓷领域。

    ZrO2具有高强度、高热稳定性、耐磨和生物相容性好等优点,广泛应用于人造牙齿[24]、特种刀具、人工关节、氧传感器等领域。ZrO2在常温常压下为稳定的单斜相(空间群P21/c),在常温至其熔点(2715 ℃)之间会发生两种相变:1170 ℃时发生单斜相向四方相(空间群P42/nmc)的相变,2370 ℃时出现向立方相(Fm¯3m)的相变[25],这两种相变都是可逆的。通过加入稳定剂(Y2O3、CeO、CaO等)形成固溶体的方式,可获得常温常压稳定的四方相和立方相[26],其中Y2O3稳定的四方相ZrO2多晶陶瓷材料因存在相变增韧现象而受到广泛关注[24, 2728]。高压条件下ZrO2单斜相向四方相的转变也得到了证实。Whitney[2930]通过理论计算发现,在3.6 GPa、室温条件下出现ZrO2单斜相向四方相的转变,并通过实验验证了该结果。Vahldiek等[31]在1.5~2 GPa、1200~1700 ℃条件下合成了单斜相和四方相混合的样品。Kulcinski[32]在超过3.7 GPa、室温条件下直接将单斜相转变成四方相。Alzyab等[33]研究了纯ZrO2以及质量分数为3%、4%和5% Y2O3掺杂的ZrO2的高压相变行为,3%和4% Y2O3掺杂的ZrO2实现了单斜相向四方相的不可逆转变。ZrO2的高压相变研究多在金刚石对顶砧中进行,主要研究不同压力下ZrO2的物相结构,但是通过高压相变方式制备小于初始原料晶粒尺寸的ZrO2多晶陶瓷材料并未引起广泛关注。

    本研究将晶粒尺寸为2 μm的单斜相ZrO2与摩尔分数为3%的Y2O3混合,在5.5 GPa、800~1700 ℃温压条件下通过高压相变合成部分相变的亚微米四方相多晶ZrO2块体陶瓷材料,进一步发展以微米晶为初始材料通过高压相变制备细晶粒多晶块体材料的方法。此方法有望解决以纳米粉末为初始材料时因纳米粉末的团聚、吸附、易长大的特性导致烧结所得多晶材料力学性能不佳的问题[3435]

    实验使用的设备为国产铰链式6×800 t六面顶压机。加热组装中,以MgO陶瓷管为高压内衬,石墨管为加热管,叶蜡石为传压介质,加压前在300 ℃下烘烤 12 h[36],组装示意图见图1

    图  1  组装示意图
    Figure  1.  Schematic diagram of assembly

    利用金属Bi在2.55 GPa、Tl在3.67 GPa、Ba在5.5 GPa下相变导致电阻突变的特点,采用高压原位电阻测量方式,对腔体压力进行标定[3637],采用B型热电偶(Pt6%Rh-Pt30%Rh)对加热组装进行了温度标定[3839]

    微米晶单斜相ZrO2由亚微米单斜相ZrO2在马弗炉中于1500 ℃下保温12 h制得。图2为亚微米晶原料和微米晶原料的X射线衍射(XRD)图谱。经分析,与单斜相ZrO2的ICSD(无机晶体结构数据库)标准PDF卡37-1484的峰位和强度吻合。1号、2号和3号峰是ZrO2单斜相的3个最强峰,其中:1号峰(2θ=28.2°)和2号峰(2θ=31.5°)为特征峰,分别对应ZrO2单斜相(¯111)和(111)晶面[40];3号峰位于34.2°,对应于单斜相(002)晶面。从图2插图可以看出,微米晶原料由于晶粒尺寸较大,导致衍射峰较窄。图3(a)图3(b)分别为亚微米晶和微米晶单斜相ZrO2原料的扫描电镜(SEM)照片。从图3(b)中可以看出,晶粒尺寸均在微米级,平均晶粒尺寸为2 μm,表明高温热处理亚微米原料获得了微米晶原料。

    图  2  亚微米原料和微晶ZrO2的XRD图谱(插图为ZrO2单斜相特征峰XRD图谱)
    Figure  2.  XRD pattern of submicron and microcrystalline ZrO2 (Inset: XRD pattern of the characteristic diffraction peaks of monoclinic ZrO2)
    图  3  亚微米晶ZrO2(a)和微米晶ZrO2(b)的SEM照片
    Figure  3.  SEM images of submicron (a) and microcrystalline ZrO2 (b)

    微米晶单斜相ZrO2与3%(摩尔分数)Y2O3原料(购于上海麦克林生化科技有限公司,平均晶粒尺寸为50 nm,纯度为99.99%)加入一定量的酒精混合,超声处理3 h后在真空干燥箱中充分干燥,将混合原料在10 MPa预压压力下压制成直径为11 mm的圆柱后放入MgO陶瓷管。样品在5.5 GPa、800~1700 ℃温压条件下合成,其中:在800~1400 ℃温度范围内,保温时间设置为1 h;1600和1700 ℃的保温时间分别设置为30和20 min。

    样品相成分通过对破碎后的粉状ZrO2样品进行XRD表征的方式确定,样品中四方相的晶胞参数通过GSAS软件精修XRD图谱的方式确定,实验仪器为荷兰PANalytical锐影系列X射线衍射仪,阳极靶材为Cu靶,工作电压40 kV,电流为45 mA。样品中四方相的含量通过XRD传统物相定量方法(绝热法定量)估算。样品中的Y元素通过对亚微米晶粒进行能谱(EDS)表征定性确定。样品形貌特征通过德国Zeiss/Auriga FIB扫描电子显微镜(SEM)观察,通过统计SEM照片中100个四方相晶粒尺寸得到样品中四方相的晶粒分布,SEM的工作电压为30 kV,工作电流为50 μA。采用日本JEM-2010型透射电镜(TEM)观察亚微米晶粒的微观结构,TEM的加速电压为200 kV。

    图4(a)图4(b)为5.5 GPa、不同温度及保温时间条件下合成样品的XRD图谱,其中M代表单斜相的特征峰,T代表四方相的特征峰。可以看出,在800~1700 ℃范围内随着温度的升高,四方相的衍射峰强度逐渐增强,单斜相的衍射峰强度逐渐减弱,表明部分单斜相转化为四方相,采用XRD物相定量分析方法估算5.5 GPa、1700 ℃烧结后四方相ZrO2的质量分数约为50%。如图4(c)所示,在800~1000 ℃范围内可以观察到微弱的四方相特征峰(2θ=30.3°)[40],对应于四方相的(101)晶面,表明只有少量四方相ZrO2生成。固态相变的驱动力来源于过冷度,过冷温度对于形核、生长以及相变速率均有重要的影响,升高反应温度有利于相变过程的进行,与本实验结果相一致。

    图  4  5.5 GPa不同温度条件下样品的XRD图谱(a)、单斜相和四方相的特征峰放大图谱(b)以及(a)中方框标记的800和1000 ℃条件下合成样品的XRD图谱(c)
    Figure  4.  (a) XRD pattern of samples sintered at 5.5 GPa and different temperatures; (b) magnified range of the characteristic diffraction peaks of monoclinic and tetragonal phases from (a); (c) XRD patterns of samples sintered at 800 and 1000 ℃ marked with dotted line in (a)

    氧化锆的四方相在常温常压下是不稳定的,通过掺杂离子(如Y3+)可以截获稳定的四方相[26, 41]。如表1所示,1400 ℃下制备的样品中四方相的晶胞参数ac分别为0.3607(6) nm和0.5219(8) nm,1700 ℃下制备的样品中四方相的晶胞参数ac分别为0.3615(5) nm和0.5168(3) nm,比未掺杂的ZrO2的晶胞参数[42]稍大,但与掺杂的四方相Zr0.94Y0.06O1.97的晶胞参数[43]相似。Y3+的离子半径大于Zr4+的离子半径,Y3+替代Zr4+位置时,由于离子半径的差异会导致晶格畸变,使晶胞参数变大。由于本研究掺杂的Y2O3量较少,四方相的晶胞参数ac的变化不明显。图5所示的EDS结果表明,1400和1700 ℃合成样品中的亚微米晶粒均发现了Y元素。EDS结果和精修得出的晶胞参数结果证实了Y3+替代Zr4+形成置换式固溶体。

    表  1  室温下稳定四方相氧化锆的晶胞参数
    Table  1.  Unit-cell parameters of tetragonal zirconia stabilized at room temperature
    Sample Processing temperature/℃ a/nm c/nm Test method
    Tetragonal zirconia 1400 0.3607(6) 0.5219(8) XRD
    Tetragonal zirconia 1700 0.3615(5) 0.5168(3) XRD
    ZrO2[42] 0.3591(1) 0.5169(1) Neutron diffraction
    Zr0.94Y0.06O1.97[43] 0.3610 0.5168 XRD
    下载: 导出CSV 
    | 显示表格
    图  5  (a) 1400 ℃温度条件下样品中亚微米晶粒的SEM照片,(b) (a)中箭头所指亚微米晶粒的EDS能谱,(c) 1700 ℃温度条件下样品中亚微米晶粒的SEM照片,(d) (c)中箭头所指亚微米晶粒的EDS能谱
    Figure  5.  (a) SEM images of submicron grains in the sample sintered at 1400 ℃; (b) EDS spectra of the submicron grain directed by the arrow; (c) SEM images of submicron grains in the sample sintered at 1700 ℃; (d) EDS spectra of the submicron grain directed by the arrow

    图6为5.5 GPa压力下不同温度合成样品的SEM照片,图7为5.5 GPa、不同温度下合成样品中亚微米晶粒的晶粒尺寸分布图。从图6中可以看到,高压烧结后得到的单斜相与四方相ZrO2烧结体的结构致密,无裂纹。从图6(a)中可以观察到,在1200 ℃保温 1 h条件下合成的样品中有一定量的微米级晶粒,可能是未相变单斜相晶粒长大的结果;从图6(b)也可以观察到在微米晶粒周围存在大量纳米和亚微米晶粒,推测为微米晶单斜相ZrO2相变后再结晶的四方相细晶粒(TEM表征也证明了该推测)。经统计,亚微米晶粒的平均晶粒尺寸为(145±62) nm,远小于初始单斜相微米晶ZrO2的晶粒尺寸,如图7(a)所示。

    图  6  5.5 GPa、不同温度下合成样品的SEM照片
    Figure  6.  SEM images of samples sintered at the condition of 5.5 GPa and different temperatures
    图  7  5.5 GPa不同温度下合成样品中亚微米晶粒的晶粒尺寸分布
    Figure  7.  Grain size distribution of submicron grains in samples sintered at 5.5 GPa and different temperatures

    图6(h)所示,1700 ℃保温 20 min条件下合成的样品中同样可以观察到亚微米细晶粒,这些细晶粒可能是由母相(单斜相)“孕育”而出的四方相晶粒。从图7(d)可以看出,该样品中亚微米晶粒的平均晶粒尺寸为(245±107) nm,相较于低温(1200 ℃)合成样品,晶粒有所长大。图6显示了1400 ℃保温 1 h和 1600 ℃保温 30 min条件下合成样品的SEM照片。从图6(d)图6(f)可以看出,样品中均出现亚微米晶粒。如图7(b)图7(c)所示,1400和1600 ℃条件下合成样品中亚微米晶粒的平均晶粒尺寸分别为(246±165) nm和(183±62) nm。

    为了证明上述亚微米晶粒为微米晶单斜相ZrO2相变后再结晶的四方相晶粒的猜测,对5.5 GPa、1700 ℃条件下制备的样品中的亚微米晶粒进行TEM表征。图8(a)图8(b)分别为样品中亚微米晶粒的低倍TEM照片和HRTEM照片。如图8(b)插图所示,亚微米晶粒的晶面间距为2.9 Å,与ICSD标准PDF卡70-4430中四方相(101)晶面间距(2.9624 Å)相符合,与Y2O3原料的(222)晶面间距(3.0610 Å)、(400)晶面间距(2.6509 Å)、(440)晶面间距(1.8745 Å)、(622)晶面间距(1.5986 Å)不符合,证实了亚微米晶粒中四方相结构的存在,支持了上述关于单斜相微米晶ZrO2相变后再结晶形成的亚微米颗粒为四方相ZrO2晶粒的猜测。

    图  8  5.5 GPa、1700 ℃合成样品的TEM照片((a)样品中亚微米晶粒的低倍TEM照片;(b)样品中亚微米晶粒的HRTEM照片,插图为虚线椭圆部位的放大图)
    Figure  8.  TEM images of the sample sintered at 5.5 GPa and 1700 ℃ ((a) Low-magnification TEM image of submicron grains in the sample; (b) HRTEM image of submicron grains in the sample. Inset: Magnified HRTEM image marked with the dotted ellipse in (b))

    新相的形成要经历形核、生长的过程。高压的引入可以提高成核率,同时抑制晶粒的生长速率,新相的晶粒尺寸与初始材料的晶粒尺寸无必然联系。本研究中XRD、SEM和TEM表征结果表明,以单斜相微米晶ZrO2为初始材料通过高压相变合成的样品中含有再结晶的纳米和亚微米四方相ZrO2晶粒。高压下以微米晶为初始材料相变合成晶粒尺寸更细的多晶块体陶瓷材料,可以避免以纳米粉末为初始材料在常压和低压(低于1 GPa)烧结过程中纳米晶粒长大的问题,同时克服了以纳米初始粉末为初始材料时存在的表面吸附、易团聚的难题。

    以微米晶单斜相ZrO2为初始材料,在5.5 GPa、800~1700 ℃温压条件下通过高压相变法实现了单斜相向四方相的部分转变,获得了小于初始材料晶粒尺寸的亚微米四方相ZrO2晶体的块体陶瓷。

    微米晶原料由于表面能低以及表面成核位点较少,在本实验的温压条件下未能实现纯相的亚微米四方相ZrO2多晶块体陶瓷的制备。需进一步探索合适的压强和温度匹配关系,从而实现高致密度、优异力学性能、纯相、亚微米四方相ZrO2多晶块体陶瓷的制备,期望将在超硬材料领域实现应用的以大颗粒粉晶(大单晶或微米晶)为初始材料通过高压相变制备高性能细晶粒多晶块体的方法推广到陶瓷领域。

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