Size Effect of Thermal Stability of Zr47Ti12.9Cu11Ni9.6 -Be16.7Nb2.8 Metallic Glass

采用真空铜模吸铸和单辊真空薄带技术制备出直径5 mm的Zr47Ti12.9Cu11Ni9.6Be16.7Nb2.8金属玻璃棒材和相同成分厚30μm的金属玻璃薄带。利用热分析技术和Kissinger方法分析计算了不同尺寸金属玻璃的热稳定性参数,主要包括:玻璃转变温度Tg,晶化温度Tx,玻璃转变和晶化激活能Eg、Ex等。结果表明:Zr47Ti12.9Cu11Ni9.6Be16.7Nb2.8金属玻璃在热稳定性上表现出"越小越稳定"的特征,薄带的热稳定性参数均高于棒材,表现出更好的热稳定性。不同尺寸Zr47Ti12.9Cu11Ni9.6Be16.7Nb2.8金属玻璃的晶化行为进一步验证了这一特征:在晶化温度远低于金属玻璃薄带情况下,棒材却更易晶化,晶化过程中获得了比金属玻璃薄带更加完整的晶化组织。     

钨丝增强(Zr41.2Ti13.8Cu12.5Ni10Be22.5)100-xNbx非晶复合材料的力学性能

采用XRD、SEM等表征方法研究钨丝增强(Zr41.2Ti13.8Cu12.5Ni10Be22.5)100-xNbx非晶复合材料的力学行为.研究表明,分别加入x=1,3,5,7(atA)的Nb后,制备的复合材料试样基体仍为非晶态:随Nb含量的增加,钨丝增强(Zr41.2Ti13.8Cu12.5Ni10Be22.5)10...     

氢对Zr41.2 Ti13.8 Cu12.5 Ni10 Be22.5 大块非晶合金晶化特性的影响

利用电弧熔炼及铜模快速铸造的方法制备Zr41.2Ti13.8Cu12．5Ni10Be22．5大块非晶合金，通过电解丙三醇和磷酸的电化学法向大块非晶中充入氢。测试了大块非晶态合金中充入氢的含量及体积变化规律，采用XRD，DSC技术研究了氢对大块非晶的晶化特征的影响。结果表明：Zr41．2Ti13．8Cu12．5Ni10Be22．5大块非晶可充入的氢与金属的摩尔比为0．92，体积膨胀3．5％；随着氢含量的增加，玻璃转变温度和晶化温度稍有提高，并使结晶过程不同阶段的放热峰变弱。     

含钴锆基块状非晶合金的制备与力学性能

采用水淬法制备了Zr—Ti—Cu—Ni—Be—Co块状非晶合金(BMGs)。使用XRD进行相分析，采用热分析仪进行玻璃转变温度、晶化温度和热稳定性等的测定，用SEM观察试样压缩后的外表面和断口形貌。研究了Co对Zr—Ti—Cu—Ni—Be合金非晶形成能力(GFA)、热稳定性及力学性能的影响。结果表明：含Co的所有Zr—Ti—Cu—Ni—Be BMGs都有1个明显的玻璃转变点和宽的过冷液相区(△T）。Zr38Ti17Cu10.5Co12Be22.5合金具有和Zr41Ti14Cu12.5Ni10Be22.5合金相当的△T；Co的添加明显提高Zr—Ti—Cu—Ni—Be BMGs的力学性能，含Co量大于10at％的Zr—Ti—Cu—Ni—Be BMGs的压缩断裂强度（σf）超过2000MPa，Zr38Ti17Co22.5Be22.5合金的σf达到2230MPa，比Zr41Ti14Cu12.5Ni10Be22.5合金的σf提高23％。     

Zr41．25Ti13．75Ni10Cu12．5Be22．5熔体与W的润湿及复合

用座滴法研究了高真空下Zr41.25Tin13.75Ni10Cu12.5Be22.5（原子百分数，下同）熔体在W上的润湿行为及界面相互作用，并用浸渗法制备了W丝增强的Zr41．25Ti13．75Ni10Cu12.5Be22.5块状非晶复合材料。结果表明：在1053K～1173K之间，Zr41.25Ti13.75Ni10Cu12.5Be22.5熔体与W具有较好的润湿性。润湿温度升高会显著降低平衡接触角，并加速熔体的铺展，但也会增大W的溶解量。继续升高温度对平衡接触角和达到平衡接触角所需时间的影响很小。好的润湿性和快的铺展速率为制备W丝增强的Zr41.25Ti13.75Ni10Cu12.5Be22.5块状非晶复合材料选择合理的工艺参数提供了较大的自由空间。     

定向凝固制备内生晶体增塑的锆基非晶复合材料

通过Bridgman定向凝固成功制备了成分为Zr58.8Ti14.3Nb5.2Cu6.1Ni4.9Be1.0的内生枝晶增塑的非晶复合材料.内生枝晶的尺寸和体积分数可以经抽拉速度的改变得以控制,进而实现了对其力学性能的调节.研究表明,枝晶的大小与抽拉速度呈线性关系,体现出定向凝同在制备非晶复合材料方面可调控析出相的优势.通过对实验参数抽拉速度的优化得出,当抽拉速度为1.0 mm/s时,最高压缩强度达到了1930 MPa,断裂塑性达到11.3%.     

Wf／ZrTiCuNiBe非晶合金复合材料的界面特征与性能

用渗流铸造水淬法制备了φ6mm×50mm的W纤维增强的Zr4125Ti13．75Cu12.5Ni10Be22.5非晶合金复合材料。采用扫描电镜（SEM）分析了相同渗流时间，不同渗流温度复合材料的界面反应形貌，并采用Push-out法测定了界面剪切强度，讨论了界面特征、界面剪切强度与宏观压缩断裂行为之间的关系。结果表明：渗流铸造法制备的W纤维增强Zr41.25Ti13．75Cu12.5Ni10Be22.5非晶合金复合材料明显提高了非晶合金的塑性和断裂强度。复合材料界面结合包括界面扩散和界面反应两个过程。界面反应程度加剧时界面剪切强度增大，复合材料的破坏方式由纵向劈裂转变为剪切破坏。     

冷却速率和高径比对钛基非晶复合材料力学性能的影响

通过制备不同尺寸的Ti45.7Zr33Ni2.9Cu5.9Be12.5非晶复合材料样品,研究了冷却速率和高径比对内生枝晶相增强钛基非晶复合材料力学性能的影响.随着制备过程中冷却速率的降低,非晶复合材料中枝晶相的尺寸逐渐增大,同时枝晶相熟化的现象也趋于明显.在力学性能方面表现为非晶复合材料的强度降低而塑性增强.与以往非晶复合材料性能对高径比比较敏感所不同的是,本工作中的Ti45.7Zr33Ni2.9Cu5.9Be12.5非晶复合材料的力学性能对高径比的变化并不敏感,原因在于晶态相的存在以及其中的形变诱发马氏体相变行为的发生对非晶复合材料内部应力分布的调节.     

Sn对Ti-Zr-Cu-Ni系非晶薄带热稳定性及耐蚀性能的影响

通过单辊甩带法制备了Ti40Cu39Zr10Ni11-xSnx(x=0,3,7,11)非晶薄带。运用X射线衍射仪(XRD)、差示扫描量热仪(DSC)、电化学工作站、扫描电镜(SEM)等手段测试了合金的组织与性能特性,研究了Sn替换Ni对合金热稳定性及生物耐蚀性能的影响。结果表明,随着Sn的添加,Ti40Cu39Zr10Ni11-xSnx(x=0,3,7,11)合金试样均表现为完全的非晶结构。与Ti40Cu39Zr10Ni11非晶合金相比,Ti40Cu39Zr10Sn11非晶合金的热稳定性稍有改善,且生物耐蚀性能得到明显提高。因此,不含Be、Ni等对人体有害元素的Ti40Cu39Zr10Sn11非晶合金具有作为生物医用材料的潜力。     

镍基非晶合金涂层的制备与腐蚀性能

用气体雾化法制备了Ni53Nb20Ti10Zr6Co6Cu3非晶合金粉末，将粒度小于25μm的非晶粉末用动力金属喷涂工艺制备了非晶涂层．研究表明，非晶涂层厚度约500μm，涂层的空隙率随喷涂温度和沉积率的增加而减少．涂层腐蚀性能的评价选用1kmol／m^3 HCl水溶液，动电位极化曲线测量表明，随着空隙率的减少，涂层呈现出与非晶合金相当的优良耐蚀性能．     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

INFLUENCE OF HEAT TREATMENT ON DAMPING BEHAVIOUR OF THE MAGNESIUM WROUGHT ALLOY AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.