ZL104加碲合金化对力学性能的影响

系统对比了加Ｔｅ及加Ｓｒ或三元钠盐对ＺＬ１０４处理后所浇注金属型试棒（经Ｔ６处理）的力学性能，结果表明，Ｔｅ的合金力学性能略低于Ｓｒ自理的，而略高于三元钠变质的；Ｔｅ处理的合金具有长效性，熔体保温８ｈ或３次重熔、每次保持６ｈ，其效果不变，长效性超过Ｓｒ变质；Ｔｅ处理的合金的伸长率较Ｓｒ处理的高４０－５０％，较三元钠盐处理的高１倍。     

Al—Sr中间合金变质效果的遗传效应

通过不同铸工艺制取的相同成要不同形貌的变质用Ａｌ－８．６２％Ｓｒ中间合金，具有明显的变质效果差异。在砂型条件下，用Ａｌ－８．６２％Ｓｒ中间合金对共晶Ａｌ－Ｓｒ合金进行变质处理，加入使Ａｌ－Ｓｒ合金含０．１％Ｓｒ的锭料和加入使Ａｌ－Ｓｒ合金含０．０５％Ｓｒ的激冷薄片，二者的变质效果相当，都为５级。在金属型条件下，加入使Ａｌ－Ｓｒ合金含０．０６％Ｓｒ锭料和加入使Ａｌ－Ｓｉ合金含０．０３％Ｓｒ的激冷薄片     

ZAlSi7Mg1A合金锶变质的研究

用０．０３～０．０８％Ｓｒ对ＺＡｌＳｉ７Ｍｇ１Ａ合金进行变质，其变质工艺为：先用Ｃ２Ｃｌ６除气，静置扒渣后加Ｓｒ，并同时通氩气，其流量为３～６Ｌ／ｍｉｎ，直至出炉浇注。该工艺可保证合金变质良好、无气，合金的综合性能较Ｎａ变质有提高。     

锶－稀土长效变质剂的应用

研究了铝－锶－稀土合金对铝硅合金中的共晶硅及亚共晶硅的细化变质作用，该变质剂变质时间可保持４小时以上不衰退，同时还具有除气和净化铝液的功能，克服了单独用锶变质时吸气及不能同时用氯化物精炼等问题，并发现了Ｓｒ与ＲＥ在变质过程中有协同效应。     

锶—稀土长效变质剂的应用

研究了铝－锶－稀土合金对铝硅合金中的共晶硅及亚共晶硅的细化变质作用，该变质剂变质时间可保持４小时以上下衰退，同时还具有除气和净化铝液的功能，克服了单独用锶变质时吸气及不能同时用氯化物精炼等问题，并发现了Ｓｒ与ＲＥ在变质过程中有协同效应。     

合金元素对Zr－Sn－Fe－Cr－Nb合金性能的影响

介绍了几种新锆合金４００℃，１０．３ＭＰａ静态高压釜试验结果和室温及高温（３７５℃）的拉伸试验结果，分析了新合金中合金元素Ｎｂ．Ｓｎ．Ｆｅ．Ｃｒ对抗伸强度及耐蚀性能的影响。结果表明：通过控制合金元素的含量，在经历与Ｚｒ－４相同的生产工艺条件下、可以得到强度和耐蚀性能更为优异的新铝合金。试验表明：这种新型的Ｚｒ－Ｓｎ－Ｆｅ－Ｃｒ－Ｎｂ中加入Ｎｂ量应在０．１ｗｔ％－０．３ｗｔ％之间；在含１ｗｔ％Ｎｂ的新合金中，Ｓｎ的含量不应低于０．５ｗｔ％：在新合金研制时，适当提高Ｆｅ＋Ｃｒ的含量是有益的，但Ｆｅ／Ｃｒ比不应太高。     

镁对锑变质激化作用的研究

研究了铸造铝硅合金中镁对锑变质作用的影响。结果表明,在一定范围内,加入锑后再加入镁,其变质能力激剧增强。文中所示锑、镁含量与力学性能关系表明,对于共晶合金,含（质量分数）０２％Ｓｂ、０６％Ｍｇ时合金的综合力学性能最高。还就镁对锑的激化机制做了初步分析。     

快速凝固Al-Sr中间合金及其变质效果

快速凝固使Ａｌ－Ｓｒ合金产生了微观组织细化、缺陷密度增加、成分均匀化以及固溶体过饱和化等变化。在Ａｌ－Ｓｒ合金快速凝固条带（以下称激冷带）横截面上出现“双区”组织。冷却速度达到１０６Ｋ／ｓ激冷带的激冷侧晶粒达到纳米级。变质实验结果表明：不同冷却速度下形成的Ａｌ－Ｓｒ中间合金具有不同的变质效果，快速凝固的Ａｌ－Ｓｒ中间合金达到与常规Ａｌ－Ｓｒ中间合金相同的变质度，其用量减少５０％～６０％，潜伏期缩短５０％左右。     

合金元素对Zr—Sn—Fe—Cr—Nb合金性能的影响

介绍了几种新锆合金４００℃，１０．３ＭＰａ静态高压釜试验结果和室温及高温（３７５℃）的拉伸试验结果，分析了新合金中合金元素Ｎｂ．Ｓｎ．Ｆｅ．Ｃｒ对抗伸强度及耐蚀性能的影响。结果表明：通过控制合金元素的含量，在经历与Ｚｒ－４相同的生产工艺条件下、可以得到强度和耐蚀性能更为优异的新铝合金。试验表明：这种新型的Ｚｒ－Ｓｎ－Ｆｅ－Ｃｒ－Ｎｂ中加入Ｎｂ量应在０．１ｗｔ％－０．３ｗｔ％之间；在含１ｗｔ％Ｎｂ的新合金中，Ｓｎ的含量不应低于０．５ｗｔ％：在新合金研制时，适当提高Ｆｅ＋Ｃｒ的含量是有益的，但Ｆｅ／Ｃｒ比不应     

Ni_3Al－Cr－Zr－B－Mg合金的高温晶界脆性SCIEI

应用电镜及Ｘ线衍射技术，研究了高温下Ｎｉ_（７５）Ａｌ_（１６．６）Ｃｒ_（７．８４）Ｚｒ_（０．４５）Ｂ_（０．１）Ｍｇ_（０．０１）合金晶界失效行为。经１１８０℃保温，由于偏聚晶界区Ｍｇ含量（ａｔ．－％）达１５－１９。同时Ｚｒ含量（ａｔ，－％）明显增大可达２８－３３；并观察到局部晶界共晶熔化现象。通过１０００℃固溶及变温热循环处理，合金中晶内出现ＣｒＮ相沉淀，沿晶界有Ｃｒ２（Ｃ，Ｎ）相析出。     

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.     

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。     

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.