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temperature, as demonstrated in Figs. 4(b-e). According to previous TEM studies, cryogenic temperature can restrict the dynamic recovery during large plastic deformation, resulting in high dislocation density in CR samples compared with RTR samples [21]. During the rolling process, a significant amount of strain energy is accumulated in the form of dislocations (Figs. 4(b) and (c)), and the number......
)相的形貌,可以看出,ZL205A合金试样中θ(Al2Cu)相主要为发达的连续网状,树枝状或骨骼状组织,网状曲线线条之间近似平行,且存在明显的团聚现象.图7(b)所示为单独施加交变磁场条件下θ(Al2Cu)相的形貌,可以看出,此时更多的θ(Al2Cu)相组织得到细化,以细小散落的碎片状或近球状存在,虽然仍存在骨骼状的θ(Al2Cu)相组织,但θ(Al2Cu)相得到了较大的细化.图7(c)所示为真空...属液产生震荡作用,电磁震荡分量如式所示[26]: (2) 式中:为磁Prandtl数;Ha为Hartmann数;为磁感应强度B的复振幅;为交变电流的角频率;t为时间,s. 由式(1)和式(2)可知,首先,交变磁场与其感应电流交互作用引发的电磁力会使得ZL205A合金在充型和凝固过程中受到两......
升高度随时间的变化规律. 由图4(a),(b)和(c)可知,尾细砂,尾粉砂和尾粉土柱体中的毛细水上升高度随时间的变化趋势基本一致,可以分为三个阶段:前期快速上升阶段,中期缓慢上升阶段和和后期稳定阶段.毛细水上升高度随着时间的增加而增大,直至毛细水上升高度达到稳定值后停止上升.由图4还可知,毛细水上升高度明显受到尾矿粒径大小的影响,粒径越小,毛细水上升高度越大,分别对不同粒径尾矿毛细水上升的前...; (7) 式中:H为毛细水上升高度;t为对应的时间;a,b和c为系数. 2.2 粒径对尾矿毛细水上升速度的影响分析 毛细水上升速度是其上升高度对上升时间的导数,图5所示为不同粒径尾矿毛细水上升速度随时间的变化关系.表3所列为不同粒径尾矿毛细水上升相同高度所用时间的对比. 图4 ......
was built by ArcGIS10.2 and ICEM software, which is 1:1 ratio to the real size and is divided into 5 regions (A, B, C, D and E) bounded by the middle section of two adjacent sampling sections. Fig. 5... surface of a certain water area gradually decreased. After an interval of 24 h, the simulation values of the heavy metal contents in sediments in regions A, B, C, D and E were compared......
].1969-10-28. [58] MAGET H J R. Process for gas purification: U.S., 3,489,670[P]. 1970-01-13. [59] PERRY K A, EISMAN G A, BENICEWICZ B C. Electrochemical hydrogen pumping using a high-temperature... cell technology[J].Journal of Natural Gas Science and Engineering, 2010,2(5): 229-234. [61] BENICEWICZ B C, EISMAN G A, GASDA M D, et al. Integrated electrochemical hydrogen separation systems: USA......
:NH2+NO2=H2NO+NO. 据推测,0.1 MPa下NO的主要有以下3条生成路径: (a) NH3→NH2→H2NO→HNO→NO; (b) HCN→CN→NCO→NO; (c) HCN→NCO→NH2→HNO→NO. 其中,R74是NO生成的主导反应,这说明路径(a)是NO最主要生成路径,而NH3是NO的主要前驱体. 提高反应压力到0.5 MPa,可以发现NO的主要生成路径发生一定改变.加压促...;在反应后期,随着反应持续进行,生成的NO会逐步与NCO和NH2发生还原反应生成N2,或者先与NCO反应生成N2O,再进一步分解为N2. 图6 N2O生成率随反应时间的变化 Fig. 6 Production rate of N2O with reaction time 从图4(b)可以看出:N2O体积分数的变化趋势与NO体积分数的变化趋势类似,均先快速升高并达到峰值,然后,随着反应时间延长......
; SEM images ((a), (b), (c), (d)) and EDS patterns ((a′), (b′) ,(c′) ,(d′)) of leaching residue 由表3可知,在优化条件下,Bi,Fe的平均浸出率分别为96.24%和93.08%,原料中含量相对较低的杂质元素Ti,Te的浸出率分别为76.02%和57.54%,Ti的浸出率较Bi,Fe低,可能是存在反应生成的...射峰,AgCl为精矿中的单质Ag还原FeCl3所得,其他元素含量较低或以非晶态形式存在未出现明显衍射峰.由图11(a),(b),(c),(d)可知,浸出渣呈大小不一的细颗粒或粉末状;由图11(a′),(c′),(d′)可知,图11(a),(c),(d)所示区域由O,Cl,Ti,Ag等元素组成,根据Cl原子和Ag原子的质量分数计算其原子摩尔比,所得结果均为1左右,结合浸出渣XRD谱,图11......
. The drawing rate is 0.001 mm/s, as shown in Figure 1(b). Large deformation bolt model is composed of elastic unit and Mohr-Coulomb unit. Mechanical parameters of tensile models are listed in Table 1. Figure 1 Tensile property of large deformation bolt [10] (a) and bolt numerical tensile models (b) Table 1 Mechanical parameters of tensile models 2.2 Results analysis Figure 2 illustrates the drawing......
roof 2.1 Mechanical model The mechanical model of the advanced pipe is shown in Figure 1(a), and mechanical model of the tunnel face stability is shown in Figure 1(b). The foundation is supposed... deflection into Eq. (1), the foundation counter stress can be obtained. 2.3 Safety factor of tunnel face stability Assuming that a potential sliding surface is a straight plane, as shown in Figure 1(b......
Gleeble-3500热模拟试验机进行等温热压缩试验,试样为直径8 mm,高度12 mm的圆柱,热变形工艺如图1(b)所示.为减少压头对试样的摩擦阻力,可在试样两端分别涂上石墨润滑剂,贴上钽片.将试样以20 ℃/s的速度加热至1 100 ℃,保温5 min,然后以10 ℃/s的速度冷却至变形温度,保温30 s以消除变形前试样的温度梯度.然后,分别以0.001,0.01,0.1和1 s-1的变形速度进....为了研究Cr4Mo4Ni4V高合金钢在热变形中动态再结晶行为,获得不同条件下再结晶临界应变,本文采用相同的方法,建立加工硬化速率与流变应力的关系曲线,如图8所示.从图8(a)和8(b)可以看出,当应变速率为1 s-1时,加工硬化曲线可以分为2个阶段:第1阶段,加工硬化速率随着应力的增大而迅速减小,之后在曲线上存在1个明显的拐点;拐点之后进入第2阶段,加工硬化速率随应力的增大又迅速减小,拐点的位置即......