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81.
S. Kida T. Itoh M. Sakane M. Ohnami D. F. Socie 《Fatigue & Fracture of Engineering Materials & Structures》1997,20(10):1375-1386
Abstract— This paper describes the microstructure of Type 304 stainless steel after cyclic loading at room temperature under tension-torsion non-proportional strain paths. The degree of cyclic non-proportional hardening is correlated with changes in the dislocation substructure. Dislocation cells, dislocation bundles, twins and stacking faults are all observed. The type of microstructure formed and resultant stress response is dependent on the degree of non-proportional loading and strain range. Cyclic stress range was uniquely correlated with mean cell size. 相似文献
82.
Sriram Ramaswamy 《Bulletin of Materials Science》1988,10(1-2):75-76
Calculations in a hydrodynamic model of quasicrystal dynamics show that dislocation motion in these systems is impeded by
a drag far greater than that in crystals. 相似文献
83.
Crystallographically oriented etch traces produced by selective etchant on (111) and (110) habit faces of dicalcium strontium
propionate [Ca2Sr(C2H5CO2)6] crystals are attributed to the growth traces nucleated during the superficial growth of crystal. This view is supported
by the absence of such etch traces on seized habit faces and from the observations of layer structure on the bottom faces.
Mother liquid acting as an etchant produces circular terraced depressions on habit faces. These depressions originate at the
sites of isolated impurity centres. Identical features such as circular etch structures bounded by cylindrical outer periphery
produced on cooled faces are attributed to isolated domains. 相似文献
84.
Sn5%Sb is one of the materials considered for replacing lead containing alloys for soldering in electronic packaging. We evaluated
the tensile properties of the bulk material at varied strain-rates and temperatures (to 473K) to determine the underlying
deformation mechanisms. Stress exponents of about three and seven were observed at low and high stresses, respectively, and
very low activation energies for creep (about 16.7 and 37.7 kJ/mole) were noted. A maximum ductility of about 350% was noted
at ambient temperature. Creep tests performed in the same temperature regime also showed two distinct regions, albeit with
slightly different exponents (three and five) and activation energy (about 54.4 kJ/mole). Ball indentation tests were performed
on the shoulder portions of the creep samples (prior to creep tests) using a Stress-Strain Microprobe@ (Advanced Technology Corporation) at varied indentation rates (strain-rates). The automated ball indentation (ABI) data were
at relatively high strain-rates; however, they were in excellent agreement with creep data, while both these results deviated
from the tensile test data. Work is planned to perform creep at high stresses at ambient and extend ABI tests to elevated
temperatures. 相似文献
85.
We propose a method of direct visualization of the spatial nanoarchitecture of dislocation networks which is based on etching away the regions with low density of structural defects from the bulk of GaN epilayers, keeping intact only the threading dislocations and a thin surface film pre-treated with low-energy Ar+ ions. The formation of nanometer-thick suspended membrane to which the dislocations are genetically attached provides conditions for the revelation of the spatial nanoarchitecture of dislocation networks using conventional scanning electron microscopy. Complementary monochromatic and panchromatic micro-cathodoluminescence images are presented. 相似文献
86.
采用悬浮区熔工艺,生长出了最大直径(等径部分)22 mm的<100>晶向锗单晶,单晶等径长度20 mm,总长度80 mm。为减小锗单晶生长中的重力作用,并提高温度梯度以增强结晶趋动力,特别设计了锗单晶生长用的加热线圈,包括设计线圈的内径为18 mm,线圈的下表面设计为0°的平角,上表面设计成9°的锥形等。改进后的加热线圈有效地减小了熔体的质量,消除了熔体因重力作用而引起的下坠及因下坠而在上界面形成的无法熔化的腰带。实验表明,锗单晶生长对功率变化非常敏感,生长过程中极易引入位错,但在有大量位错的情况下,晶棱能依然保持完好。 相似文献
87.
Displacement fields have been calculated around 1/2[111] screw dislocations with various types of core structures in bcc metals. Three types of cores are studied: two types of polarized cores with large and small extensions of the displacement fields and an isotropic core. The difference in the displacement along the [111] direction Δuz from that for the elastic solution has been evaluated for each type of dislocation. In the outside of the core region, the Δuz values are close to zero along the six
directions and the regions with Δuz>0 and Δuz<0 are alternately arranged, lying between those directions. Appreciable difference in Δuz has been detected between the polarized cores and the isotropic core up to large distance from the core region. The defocus convergent-beam electron diffraction patterns have been calculated for the dislocations with the incident beam parallel to the dislocation line. Winding and spiral features have been shown in the higher-order Laue zone (HOLZ) lines for the dislocated structures, which have been confirmed by a preliminary experiment. In addition, small shifts of the HOLZ lines have been shown by the calculation between the polarized cores and the isotropic one. 相似文献
88.
Wei Cai Vasily V. Bulatov Jo o F. Justo Ali S. Argon Sidney Yip 《Computational Materials Science》2002,23(1-4):124-130
We describe a kinetic Monte Carlo (kMC) approach to modeling dislocation motion, directly linking the energetics of dislocation kink nucleation and migration on the atomistic scale with the experimental data on the microscale. A study of planar glide of screw dislocation in Si, an ideal test-bed for our method is first discussed, followed by preliminary results for a more complicated problem, three-dimensional motion of screw dislocation in BCC metals. We find that accuracy of the model predictions, even in the favorable case of Si, cannot claim to be quantitative because of uncertainties in the atomistic results for kink energetics. On the other hand, the kMC method is useful for qualitatively probing the mechanisms controlling dislocation motion, and it is capable of providing plausible explanation of some puzzling features of the experimental data. 相似文献
89.
90.
为研究固着磨料高速研磨工件表面硬度的变化规律,对加工零件的硬化现象与研磨工艺参数之间的关系进行了研究。结果表明,磨料粒度的增加,并未引起工件表面硬化程度的明显变化;随着研磨压力和速度的增加,工件表面硬化程度变大。分析认为,研磨后工件表面发生位错增殖,从而导致位错密度增加;同时由于位错运动导致的位错交割,是导致工件表面硬化的主要原因。该工艺具有节约磨料、环境污染小、加工工艺简单、加工质量好、加工效率高等优点。 相似文献