镁合金表面喷铝防腐蚀层的微观组织分析

在AZ91D镁合金表面热喷铝，用以提高其表面的耐腐蚀性能。采用SEM，EPMA等方法对AZ91D表面喷铝扩散层的组织进行了仔细的观察与分析，发现在防腐蚀层上有大量的Mg17Al12相存在，且呈决状及非连续片状分布。经显微硬度测定，喷铝层硬度较镁合金基体高；腐蚀后这种相凸出于基体，比镁合金基体有较好的耐腐蚀性能。     

残留奥氏体对1500MPa级新型低碳Mn-Si-Cr系合金钢冲击韧度的影响

15 0 0MPa级无碳化物贝氏体 马氏体复相钢的第一类回火脆性开始温度高于 36 0℃。实验表明 ,这并非由于贝氏体 马氏体复相韧化 ,而是与无碳化物贝氏体中的膜状残留奥氏体有关。无碳化物贝氏体中机械稳定性较高的残留奥氏体可能是导致无碳化物贝氏体 马氏体复相钢第一类回火脆性开始温度升高的直接原因。     

Cold Gelation of β-lactoglobulin in the Presence of Iron

ABSTRACT: To protect and transport iron, we investigated the trapping properties of a network formed from β-lactoglobulin. We studied the influence of different parameters—pH, iron, and protein concentrations—on gel properties (optical and mechanical properties, WHC, and microstructure). For all conditions tested, the results show the formation of a cold gel in the presence of iron. The mechanical properties reveal that the elastic behavior and the strength of rupture increase with higher protein concentrations and decrease with higher iron concentrations. The water-holding capacity is high for low iron concentrations. The microstructure shows that, at low iron/protein ratios, a homogeneous filamentous network is obtained whereas, at high iron/protein ratios, more random aggregated particles are present.     

Recovery retardation in equal channel angular pressed Al–Zr alloy during friction stir welding

The effect of Zr on reduction of hardness and microstructure in an FS weld of equal channel angular-pressed Al alloy was investigated. Zr addition to Al suppressed dynamic recovery in the thermomechanically affected zone and enabled retention of the high hardness of the ECA-pressed material throughout the weld.     

Al-Cu-Fe系初生准晶相凝固过程的电子显微分析

采用包括金相（OM），粉末X射线衍射（XRD），扫描电子显微镜（SEM）观察和透射电子显微（TEM）分析等方法，研究了铸态Al592.Cu36.8Fe3.0Si1.0合金（700℃保温2．5h后水淬）的显微组织及相组成。发现铸锭中存在4种相：准晶I相，τ3相（或φ相），θ－Al2Cu相和η－AlCu相，凝固过程可描述为：初生晶是准晶Ⅰ相；在保温过程中发生包晶或共晶反应（L＋i→τ3(或φ）或L→τ3（或φ）＋i)形成的τ3相（或φ相），呈微畴结构；而剩余液体水淬形成θ－Al2Cu相和η－AlCu 相。     

应用频率-初速法测试推算单桩承载力须解决的几个关键问题

本文对当前频率 -初速法应用中存在的一些问题阐述了作者的看法并着重探讨桩振初速度V0的计算方法、W0 的正确单位、如何使桩 -土体系明显震动、怎样从激振曲线中突出及分离出桩振曲线 ,从而获得正确的桩振频率f0 和首波峰 -峰值Ad、动静对比系数 βv 的选取     

稀土锆莫来石耐火材料的显微结构研究

本文运用ＸＲＤ、ＳＥＭ等方法对稀土锆莫来石耐火材料的显微结构，物相变化，以及稀土的作用机制进行了研究。     

Non-contact methods of measuring moisture concentration in external layers of building partitions: III—Water vapour condensation on the cementitious surfaces

This paper presents the results of the larger study into a potential application of laser radiation for the detection of phase transition processes in low temperatures occurring on the surface layers of cementitious materials. An attempt was made to identify relationships between the environmental conditions—temperature and air humidity, and the selected parameters of the reflected light. Onset of the condensation process and formation of water microdrops on the surface of the material leads to the phase displacement of individual laser rays, which are represented by different speckle images.

Although the analysis of parameters of the reflected light are very difficult in the case of porous materials because of highly developed roughness of the surface structure it has been proved that a dynamic study of the phase transition phenomena can be successfully carried out without mechanical intervention.     

Recent developments of high-performance NEOMAX magnets

For further improvement in achieving extremely high magnetic properties of Nd- Fe- B sintered magnets, extensive investigation has been done to densify the magnet up to the theoretical value, to increase the volume fraction of the Nd ₂Fe₁₄B matrix phase, and to achieve a high degree of alignment. By controlling chemical composition and the amount of constituent phases,improving particle size distribution, and adopting the isostatic pressing method to get better alignment of fine particles, we have succeeded in obtaining a high-performance magnet having residual flux density (B_r) of 1.495 T (14.95 kG), maximum energy product [(BH)_max] of 431 kj/m³ (54.2 MGOe), and intrinsic coercivity (iH_c) of 845 kA/m (10.62 kOe).     

LaxBa1—xCoO3系导电陶瓷的显微结构与电特性关系的研究

通过Ｘ射线衍射分析和扫描电镜观察，得到了ＬａｘＢａ１－ｘＣｏＯ３系导电陶瓷的显微结构，并发现当Ｘ从０到１变化时，相结构随之发生六方－立多－多相结构变化。在显微结构形态上，呈现出晶粒通道网络，室温电阻率与显微结构之间有明显的对应关系。