变晶

The results show that the flow stress decreases with increasing deforming temperature and increases with increasing strain rate. The flow stress of the alloy during hot compression deformation can be described by constitutive equation in hyperbolic sine function with a hot deformation activation energy of 196.27 kJ/mol. Partial recystallization takes place in the alloys deformed at a high temperature or at a low strain rate, and large number of dislocations and subgrains are observed in the alloy. The elongated grains observed in the samples coarsen with increasing temperature and decreasing strain rate. Correspondingly, the subgrain size increases and the dislocation density decreases. The main soften mechanism of the alloy transforms from dynamic recovery to dynamic recrystallization.

结果表明：Al-Cu-Mg-Ag耐热铝合金在热压缩变形中的流变应力随着温度的升高而减小，随着应变速率的增大而增大；该合金的热压缩变形流变应力行为可用双曲正弦形式的本构方程来描述，其变形激活能为196.27kJ/mol；在变形温度较高或应变速率较低的合金中发生部分再结晶，并且在合金组织中存在大量的位错和亚晶；随着温度的升高和应变速率的降低，合金中拉长的晶粒发生粗化，亚晶尺寸增大，位错密度减小，合金的主要软化机制逐步由动态回复转变为动态再结晶。

We make the effect width shorter and the effect length longer to decrease the leakage current by the seams in the poly-resistor. There are two kinds of seam in our thesis. One shape is spiral and the other is like a concentric circle.

我们将复晶矽电阻开缝隙，使元件电极看到的复晶矽电阻等效宽度变小或等效长度变大，藉此降低漏电流，本论文有同心圆缝隙及螺旋型缝隙两种结构。

To β-Si3N4 transformation and β′-Si3N4 grain growth as well as the devitrification and crystallization of amorphous phase may induce the fiber reinforcing effect, which affects the flow behavior of superplasticity for Si3N4 ceramics.

在Si3N4和Sialon陶瓷的超塑性变形中，α→β-Si3N4的相变以及β-Si3N4的长大和晶界玻璃相的析晶引起的纤维强化，将影响Si3N4陶瓷超塑性的流变特性。

The resulting materials were characterized by x-ray diffraction, Fourier transform infrared spectroscopy, Nuclear magnetic resonance and Photoluminescence. Those spectra reveal that by adding SiO2 to YAG:Ce precursor, the lattice constant decreases while vacancies are generate due to the co-dopant ions (Si4+) replaces in the place of Al3+ sites of YAG:Ce system. YAG:Ce phosphors with Y3+ dodecahedral site replaced by Ce3+ and diffused effectively as an activator, as a result the photoluminescence intensity increased about ~20-30%.

研究成果显示，掺杂SiO2之YAG：Ce萤光粉经过高温热处理后，由X光绕射、红外线吸收光谱仪以及核磁共振可以得知，当SiO2添加量增加时，YAG：Ce晶格常数会因为Si4+取代Al3+的四面体晶格位置而变小，同时产生将YAG：Ce之铝离子空位缺陷，使活化中心更有效地在YAG：Ce主体中扩散取代Y3+的十二面体晶格位置，提高其发光性质约20~35%。

Phase change memory with N-GST can realize three-state storage in one PCM cell by using the resistivity difference between the amorphous state, the face centered cubic phase and the hexagonal phase of GST.

利用N-GST薄膜的非晶态、晶态面心立方相和晶态六方相的电阻率差异，能够在同一存储单元中存储三个状态，实现相变存储器的多态存储功能。

Pimelic acid is a weak β nucleator ,the β crystal form which induced is not stable and transforms to αcrystal form during heating,so the DSC peaks widen.

庚二酸是低活性β晶型成核剂，生成的β晶型不稳定，易在加热时转变为α晶型，造成DSC熔融峰变宽。

For spin-3/2 Isingmodel with transverse crystal field,the tricritical phenomena havebeen observed for the square and simple cubic lattice,but there isno tricritical point for the honeycomb lattice.

横向晶场中自旋为3/2的Ising模型中，对于蜂窝点阵晶格来说，系统相变没有三相点，而正方点阵、简立方点阵晶格却有三相点的存在。

The content of the irregular bigger drop phase approached to pyrope. It showed that the crystallization and phase separation mechanics of the glass was the nucleation-and-growth transformation and the crystallization is bulk crystallization. The activation energies of phase separation and crystallization were calculated by the modified Kissinger method, about 310.445 KJ/mol and 249.26 KJ/mol respectively. Using the aluminum hydroxide as the reference, we calibrated the phase separation exothermal enthalpy of the quenched and nucleation treated glass, ca

钠镁侣硅系统徽晶玻瑞快速徽晶化机理的研究利用上式求得混合系统中两相的单位体积相变自由能、两相间的表面能和相互作用参数，分别为刁。6753xlo3了zcm3·、3ss.gozzem3、5.316xlo一JzcmZ和一442 xlol，进而求得球形核的临界半径为nnm，以及一个临界核的成核自由能变化为2石89 x10一14/cm3；成核半径16.5纳米时，球形核稳定存在，实测 1752个球形核中最小核半径为20纳米，与计算结果基本吻合。

More defects forming in the growth plate during deposition almost attribute to the lattice constant relaxation, which makes its lattice constant get larger. However, self-annealing of diamond thick films for long time in the process of deposition makes their lattice constant in their interior and nucleation plate approach its natural value.

化学气相沉积金刚石初期生长的晶体存在大量的空位等缺陷，晶格松弛，在金刚石膜持续生长过程中，形核面和膜内部在高温下发生长时间的自退火，缺陷浓度下降，晶格松弛现象消除，晶格常数变小并趋于理论值。

The role of a-Si:H sublayers is to interrupt the continuous growth and limit the thickness of pc-Si:H sublayers. The a-Si:H sublayers are deposited by two methods, one is fabricated by low hydrogen dilution ratio R = 4, and the second is deposited by pulse-wave modulation plasma with turn-on time (TON = 25 ms) and plasma turn-off time (TOFF = 75 ms).

阻断层所用的非晶矽薄膜采用两种方式制作，第一种是利用低氢稀释比(R = 4)制作的非晶矽，第二种是利用脉波调变电浆开启时间及开关时间分别为25ms及75ms pulse(25ms/75ms所制作的非晶矽。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。