激光材料

The results show that the composite coating is metallurgically bonded to the substrate and the microstructure is fine and uniform. The hardness of the composite coating is up to 400 HV, which is 2.5 times that of the substrate. Under room temperature and oil lubrication condition, the sliding wear tests indicate the friction coefficient and weight loss of the composite coating are smaller than those of substrate. The worn surface of the composite coatings is much smoother than that of the substrate, without grooves and crater.

结果表明，复合材料涂层与基体形成良好的冶金结合，微观组织细小、均匀；复合材料涂层硬度达400HV，约为基体的2.5倍；在室温油润滑条件下，滑动磨损试验表明复合材料涂层摩擦系数和失重均小于基体，磨损表面划痕较浅且平滑，无明显的犁沟、粘着、剥落现象；激光表面合金化显著提高了材料的耐磨性。

The 20 mm long KTA crystal cut for typeⅡ noncritical phase matching was adopted as the nonlinear crystal parametric converter in this experiment.

激光基质材料采用Nd：YVO4晶体，采用按Ⅱ类非临界相位匹配切割、长20 mm的KTA晶体作为非线性光学晶体。

Laser melting could restrain the formation of carbides to a large extent and the peritectic reaction in low carbon steel.

各种材料经激光熔凝处理后均可得到两种组织，一是高硬度的共晶表层（~1070HV），二是硬度较低的枝晶组织，前者主要因碳化物和M强化，而且组织细密所致，后者主要因γ含量很高所致。

Photoemissive materials are now used forgenerating high brightness electron bea■s.Drivenby short-pulsed laser,these new cathodes willmeet the requirment of large rf-driven freeelectron lasers.

为了满足射频直线加速器及其驱动的大功率自由电子激光器研究的需要，以脉冲激光激发光电发射材料产生高亮度电子束的研究正日益受到重视。

Due to this characteristic, UPL materials show extensively applications in short-wave laser, three-dimensional display, IR radialization detection, laser anti-counterfeiting brand, biology fluorescent label and so on.

上转换材料所具有的这一性质使其在短波长激光器、三维立体显示、红外辐射探测、激光防伪和生物荧光标记等领域具有广泛应用。

The preparation of metastable materials was explored in view of the nucleation and growth kinetics by means of high undercooling and high velocity laser resolidification techniques.

通过深过冷和高速激光重凝技术，从形核和生长两个不同方面探索了块体亚稳相材料的制备技术。

Based on the metastable phase formation mechanism of the rapidly solidified Ti-Al peritectic alloy, two effective surface modification processes of laser resolidification were put forward to perform the design of the phase structure in the bulk materials, which would widen the application range of Ti-Al alloys.

按照快速凝固 Ti-Al 包晶合金中亚稳相形成机制，提出了两种新的激光重凝表面处理技术，实现了块体材料的相组成设计，为拓宽 Ti-Al 合金的应用范围提供了新的思路。

The formation of secondary phase in the non-equilibrium peritectic reaction was observed by precise transmission electron microscopy analysis. The microstructural evolution and phase selection regularities under different solidification velocities were constructed from the laser resolidification experiments. A new phenomenon involving two-phase coupled growth was firstly detected in the rapidly solidified Ti-Al peritectic alloy. The Ti-45Al-2Cr-2Nb alloy with fully lamellar structure ( a 2+ g ) was taken as an object to investigate the possible preparation of bulky metastable g phase materials based on both adjusting the competing nucleation relation and changing the growth kinetics condition.

首先通过过冷合金微观组织分析界定了各包晶合金熔体中各竞争相以初生相出现的过冷度区间；结合高温区的相图计算，从各相形核孕育时间角度揭示了过冷熔体中亚稳相与稳定相的竞争形核关系；通过精细微观组织分析，阐明了远离平衡时包晶反应中次生相的形成机理；在激光重凝快速凝固实验中建立了不同凝固速度下合金的组织与相形成规律，并对包晶合金中两相共生生长行为进行了深入分析；最后选取初生相为 a 的全层片 Ti-45Al-2Cr-2Nb 合金，从调整各相竞争形核关系和改变晶体生长动力学条件两个方面探索了块状亚稳 g 相材料的制备和控制。

In this paper the reverse saturable absorption in the organic material ZnTBP/CA/PhR is reported.

报道了有机材料ZnTBP／CA／PhR对激光的反饱和吸收特性。

Noncrystal materials ; laser induced self propagating reaction ; exothermic reaction ; bulk amorphous alloy ; composite material ; Zr based alloys

非晶材料；激光诱导自蔓延反应；放热反应；大块非晶合金；复合材料； Zr基合金

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新