等变晶的

ABSTRACT In this thesis, the microstructure, the in situ tensile fracture processes and the mechanism of deformation and fracture of the SiC whisker reinforced aluminium composites made by a squeeze casting method were studied by means of SEM, TEM, HVEM, AES, HREM, electronic tensile machine and magnetic tape recorder. The dislocation theory and the complex function method were also used during analysis.

本文利用扫描电镜、透射电镜、高压电镜、俄歇谱仪、高分辨电镜、电子拉伸机和磁带式记录仪等设备和技术以及位错理论和复变函数方法研究了由高压凝固铸造法制备的碳化硅晶须增强铝复合材料的显微组织、动态拉伸断裂过程以及在特殊条件下变形和断裂的规律。

Based on this,the effect of firing schedules on the opacification was also observed.

采用DSC、XRD和TEM等测试手段，研究了分相-析晶乳浊熔块在热处理过程中的相变过程，并在此基础上研究了不同的烧成制度对釉面乳浊度的影响。

It is discovered that there is a new magnetic transition: the first order spin reorientation reform , at which the magnetization, the anisotropy coefficients and the mean fields of the two - sublattice system change, accompanying with the spin reorientation.

还发现存在一级自旋再取向重整转变，在发生自旋再取向转变的同时双亚点阵系统的磁化强度，磁晶各向异性参数，分子场等磁性的大小都发生改变，是一种新型磁性相变。

The dynamic tensile tests are carried out on the pneumatic indirect bar-bar tensile impact tester. The influence of strain induced austenite transformation and deformation twins on the mechanical properties and fracture behaviors of the studied TWIP steels are investigated using LOM, XRD, SEM and TEM techniques.

动态拉伸试验在气动式间接杆杆型冲击拉伸试验机上进行，采用LOM、XRD、SEM和TEM等手段分析研究了奥氏体的形变诱发相变和形变孪晶对TWIP钢力学性能的影响，并分析了TWIP钢的断裂行为。

Dielectric, piezoelectric and electrmechanical coupling properties of PZT and PSZT systems at high Zr content region were studied. The feature of high Kt and low Kp of PZT-based materials near F-AF phase boundary was exploited and examined, and electromachanical coupling anisotropy Kt/Kp is higher than that at the morphotropic phase boundary , Kt≥0.40, Kt/Kp≥3. 0. This phenomenon can be realized by electric field -induced AF-F phase transition and explained by coupling effect of two-sublattice in antiferroelectric unit cell.

研究了PZT和PSZT两个系统在高锆区的介电、压电和机电耦合等性能，首次发现了PZT基材料在铁电-反铁电相界处具有高Kt和低Kp的性质，机电耦合各向异性Kt/Kp也比准同型相界要高，Kt≥0.40，Kt/Kp≥3.0，并把这一现象归因于电场诱导AF-F相变和反铁电双子晶格间的强耦合作用。

Finally roud and flat elliptic cross-section samples with uniform shape, smooth surface and unidirectional crystals have been successfully obtained.

最终在等截面送料、变截面送料的条件下分别抽拉出了成形良好，表面光洁，具有单向柱状晶组织的圆形截面、扁椭圆形截面的样件。

Through testing practically and calculating theoretically, this paper has evaluated generally the energy consumption of the SCR arc welding power source?the DC arc welding generator and the inverter arc welding power source for manual arc welding machine used in production.

通过实际测试与理论计算，对晶闸管整流电源弧焊机、直流弧焊发电机和逆变电源弧焊机等生产中常用的焊条电弧焊焊机的耗电量情况进行了综合评价。

Products involving rough, drawing, extubation reduced strokes, straight rod, special-shaped, natural diamond, polycrystalline mode, as well as bicycles, sewing machines dedicated mold standard parts, odd-shaped molds for various species, is strong in technology have advanced equipment to improve its service life detection is 30 times more than high-speed steel, non-disposable, can be used many times to repair, rehabilitate unchanged after life.

产品涉及毛坯、拉丝、拔管缩杆、直杆、异形、天然钻石、聚晶模以及自行车、缝纫机标准件的专用模具、奇形模等多样品种，力量雄厚工艺设备先进，检测完善它的使用寿命是高速钢的30多倍，非一次性，可多次修复使用，修复后寿命不变。

Products involving rough, drawing, extubation reduced strokes, straight rod, shaped, natural diamond, polycrystalline modulus as well as bicycles, sewing machines dedicated mold standard parts, odd-shaped molds for diverse species, is strong in technology have advanced equipment to improve its service life Detected are 30 times more than high-speed steel, non-disposable, can be used many times to repair, after repair the same life expectancy.

产品涉及毛坯、拉丝、拔管缩杆、直杆、异形、天然钻石、聚晶模以及自行车、缝纫机标准件的专用模具、奇形模等多样品种，力量雄厚工艺设备先进，检测完善它的使用寿命是高速钢的30多倍，非一次性，可多次修复使用，修复后寿命不变。

The results indicated that the main composition of the sample is α-AsS, with monoclinic crystal system, and there are some trace elements of Ca, K, Mg, Fe, Al, Pb. The appearance of the sample is block and pillar. when heated to about 273.2℃,α-AsS is translated to β-AsS, the melting point is about 304.4℃, and at about 355.5℃, the sample starts losing weight and decomposing.

结果表明：该雄黄标本主要物相为α雄黄，单斜晶系，含有少量α石英(α-SiO2)和雌黄(As2S3)，及微量Ca、K、Mg、Fe、Al、Pb等元素，表面自然结构为柱状或块状，273.2℃时发生AsS由α型转变为β型的相变，304.4℃时为AsS的熔点，355.5℃时失重分解。

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。