过饱和ZA27的尺寸收缩及其与组织转变的关系

研究了过饱和ＺＡ２７的尺寸变化规律及其与组织转变的关系。过饱和ＺＡ２７在８０℃时效过程中发生迅速而明显的尺寸收缩现象,其收缩率高达０．３０％左右,随后尺寸变化很小。铜加剧尺寸收缩。η相（锌相）和ε相（ＣｕＺｎ４）从过饱和固溶体中迅速脱溶是造成尺寸收缩的原因。     

热处理对ZA27合金组织和性能的影响(英文)

采用X射线衍射(XRD)、扫描电镜(SEM)及力学性能表征等手段,研究热处理对ZA27合金组织和性能的影响。结果表明,合金的铸态组织主要由α、β、η和ε相组成。经365℃固溶处理1h后,α和η相消失,组织主要由过饱和β相组成。过饱和固溶体的分解分为两个阶段;在时效初期,过饱和β相发生分解;随着时效时间的延长,ε相发生四相反应:α+ε→T′+η。通过适当的热处理工艺,ZA27合金可以获得理想的伸长率和强度匹配。     

Ce对ZA43合金组织和性能的影响

研究了Ｃｅ对高铝锌合金（ＺＡ４３）组织性能及淬火－时效过程的影响。确认加Ｃｅ处理后,ＺＡ４３合金中含有Ｃｅ化合物的存在,并分析测定了含Ｃｅ化合物的化学成分。在此基础上提出了Ｃｅ细化ＺＡ４３合金α相机理：加Ｃｅ后成分过冷效应所引起的枝晶分枝熔断脱落对细化α相起主要作用。     

Ce对Zn-Al合金组织性能的影响

研究了Ｃｅ对ＺｎＡｌ合金（ＺＡ２７、ＺＡ４３）的力学性能、淬火时效特性及耐磨性的影响。结果表明,Ｃｅ能明显细化合金的铸态组织,提高其强度和塑性。当ＺＡ２７和ＺＡ４３中含Ｃｅ量分别为０．１０％和０．１５％时,获得最佳的力学性能。提出了Ｃｅ细化ＺｎＡｌ合金的机理,加Ｃｅ后成分过冷效应所引起的枝晶熔断脱落对细化α相起主要作用。     

喷雾沉积高硅ZA27合金的组织与性能

报道喷雾沉积高硅ＺＡ２７合金的组织和高温性能，采用环缝式雾化器，氮气雾化，钢基底水平单向运动，合金成分为标准ＺＡ２７中添加４％Ｓｉ和０．３％Ｆｅ，喷雾沉积组织由孔洞（２－４％）富硅相（３９－４０％）和基体构成，富硅相呈球状弥散均匀分布，时效之前，喷雾沉积与常规铸造高硅ＺＡ２７合金的显微硬度和高温（１５０℃）硬度没有明显差别，长期时效之后，喷雾沉积合金的上述性能明显高于常规铸造合金，喷雾沉积与合金化     

Ce,La对高阻尼Zn—22%Al合金阻尼稳定性的影响

采用自然时效、人工时效等热处理工艺,借助航向电镜和室温低频扭摆内耗仪,研究了微量Ｃｅ,Ｌａ对高阻尼Ｚｎ－２２％Ａｌ合金时效后显微组织和阻尼性能（内耗）的影响。结果表明,经水淬后８０℃温轧的Ｚｎ－２２％Ａｌ合金在低于温轧温度下时效时,其阻尼性能 量Ｃｅ,Ｌａ的加入,提高了经水淬后８０℃温轧的Ｚｎ－２２％Ａｌ合金的阻尼性能,减缓了经１５０℃时效后阻尼性能的降低。     

喷雾沉积Ce变质高硅ZA27合金组织与性能

研究了０５％Ｃｅ变质前后喷雾沉积高硅ＺＡ２７合金的组织与力学性能。喷雾沉积高硅ＺＡ２７合金的组织由富Ｓｉ相、光滑无特征区、细层片状共析体、粗层片状共析体所组成；加０５％Ｃｅ变质后，组织结构大大细化，主要由富Ａｌ、Ｃｅ亮点状相、富Ｓｉ、Ｃｅ多角形相以及细层片状共析体组成；显微硬度测量结果表明，Ｃｅ变质提高了材料的塑性，从而有利于高硅ＺＡ２７合金的推广应用。     

Mg,Cu及时效对ZA27合金组织和腐蚀特性的影响

研究合金元素Ｍｇ和Ｃｕ及时效处理时间及ＺＡ２７合金的组织和腐蚀特性的影响。研究发现，元素Ｍｇ，Ｃｕ和时效处理对合金的组织转变有大影响，Ｍｇ抑制α和β相的固相转变，而Ｃｕ促进α和β相的固态转变，从而影响合金的腐蚀特性。根据盐雾腐蚀试验结果结合组织特征得出：ＺＡ２７合金中Ｍｇ和Ｃｕ的合适加入量分别为０．０３％－０．２０％Ｍｇ，０．５％－２．５％Ｃｕ，最佳时效处理时间为２ｈ适宜。     

铝、铜、镁对铸态锌基合金组织和阻尼性能的影响

研究了铝、铜、镁等合金化元素对铸态锌基合金组织和室温下阻尼性能的影响， 利用悬臂梁法测试了合金的阻尼性能。结果表明， 锌铝二元合金随铝含量增加， 初生α相增多， 共晶体逐渐减少直至消失。镁、铜等合金元素对Ｚｎ２７ ％ Ａｌ 合金α相的大小和分布无大的影响。镁、铜可固溶于基体中， 当其含量较高时， 分别在组织中形成ＭｇＺｎ２ 化合物和ＣｕＺｎ５ 化合物， 分布于晶界。铝含量在６ ％ ～６０ ％ 范围内的锌铝合金在铸态下均具有高的阻尼能力； 铜、镁等合金化元素的加入降低了Ｚｎ２７ ％ Ａｌ合金的阻尼性能。ＺｎＡｌ 系合金的高的阻尼性能是在外部的交变应力作用下， 晶界和相界间的粘滞性滑动以及α相发生局部的微塑性变形， 使振动能量得以消耗而造成的     

90 ℃时效对固溶态ZA27合金组织与性能的影响

对ZA27合金进行365℃/3 h的固溶化处理,研究90℃时效对其拉伸性能及阻尼性能的影响。结果表明,固溶态ZA27合金经过90℃、6 h时效后的组织主要由α相和η相层片组织组成,另有少量粒状组织。固溶态合金的拉伸强度和阻尼性能均较低,伸长率较高。时效使合金拉伸强度和阻尼性能先提高后下降;使延伸率先降低后提高。时效6 h后ZA27合金的拉伸强度为401 MPa,伸长率为6.6%,阻尼性能为3.0×10^-3。     

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.     

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。     

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.     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.