Al—Si系合金制备工艺与微观组织的关系

分别采用双级雾化、超音气体雾化、喷射沉积和金属型铸造等工艺制备了Ａｌ－２０Ｓｉ和２０２４－２０Ｓｉ－５Ｆｅ 合金。利用ＸＲＤ、ＴＥＭ 和ＳＥＭ 测试技术分析了制备工艺对合金相组成、α－Ａｌ相晶格常数和固溶度的影响。结果表明：当制备工艺的冷却速度达到１０３ Ｋ／ｓ 以上时,β－（Ｆｅ２Ｓｉ２Ａｌ９）、ＣｕＡｌ２ 和Ｍｇ２Ｓｉ相的析出得到有效抑制;第二相随制备工艺的冷却速度增大而细化,α－Ａｌ相的晶格常数减小;Ａｌ－２０Ｓｉ合金中硅元素在α－Ａｌ中的最大固溶度高达３．２０９％ 。     

Cu-Al-Mn合金脱合金腐蚀现象的研究

采用电子探针技术研究了Cu-Al-Mn合金脱合金腐蚀现象及其产物，结果表明．Cu-Al-Mn合金中亚稳β相含销量较高．优先发生脱铝腐蚀．并沿着亚稳β相不断扩展，待亚稳β相完全被腐蚀后，腐蚀向α相扩展．腐蚀产物中含有铝元素、氯元素及氧元素。腐蚀初期．因亚稳β相脱铝而使该区成为贫铝富铜区；腐蚀后期，亚稳β相被完全腐蚀而使该区成为富销的产物区。     

QA19—2合金脱铝腐蚀的TEM研究

针对QA19－2合金在海洋环境中亚稳β相优先脱铝腐蚀的问题，利用TEM，EDX以及XRD分析，对其发生脱铝和未发生脱铝的区域进行了细致的研究。结果表明，QA19－2合金的脱铝腐蚀与亚稳β1相的马氏体相变有关，腐蚀优先发生在相变产物片状β′、相区，β′1马氏体相的优先腐蚀是由有序的DO3结构及其内部存在的大量层错造成的。同时在TEM下观察到脱铝腐蚀形成的小孔及高含铝量的细小腐蚀产物。     

快速凝固Al—20Si—5Fe合金的退火组织变化

利用ＸＲＤ、ＤＳＣ以及ＴＥＭ方法研究了快速凝固Ａｌ－２０Ｓｉ－５Ｆｅ合金退火态的微观组织、弥散相结构和相转变。结果表明,快凝Ａｌ－２０Ｓｉ－５Ｆｅ合金组织中存在两种弥散相,δ－Ａｌ４ＦｅＳｉ２和初生Ｓｉ相,退火温度低于３１０℃时,δ－Ａｌ４ＦｅＳｉ２相未明显粗化;当退火温度高于３１０℃时,亚稳相δ－Ａｌ４ＦｅＳｉ２转变成稳定相β－Ａｌ５ＦｅＳｉ,β－Ａｌ５ＦｅＳｉ相随退火温度的提高而明显粗化。高温     

Fe—Mn─Al合金的腐蚀性能与钝化膜的研究

应用阳极极化及ＡＥＳ／ＸＰＳ技术,研究了Ｆｅ－３０．８Ｍｎ－８．２Ａｌ奥氏体合金在ｐＨ值为－０．８至１５．３的水溶液中的腐蚀性能,并与Ｆｅ－３０Ｍｎ合金、低碳钢、９％Ｎｉ低温钢及１Ｃｒ１３不锈钢进行对比。在所测试的水溶液中,该合金的腐蚀抗力优于低碳钢和Ｆｅ－３０Ｍｎ合金,与９％Ｎｉ钢相当,但不及１Ｃｒ１３不锈钢。Ｆｅ－３０．８Ｍｎ－８．２Ａｌ合金在１ｍｏｌ／ＬＮａ２ＳＯ个中形成的钝化膜的最表层可能为氢氧化物,而膜的主体由Ｆｅ２Ｏ３、Ｍｎ２Ｏ３及Ａｌ２Ｏ３组成。     

扫描隧道显微镜研究Cu—Zn—Al合金中贝氏体及其浮突

用扫描隧道显微镜（ＳＴＭ）在大气中研究了Ｃｕ－２７．２Ｚｎ－４．７Ａｌ合金中贝氏体的精细结构及浮突形态。在浮突和腐蚀后的组织上都发现，Ｃｕ－Ｚｎ－Ａｌ合金中的贝氏体确是由亚片条和亚单元所组成。进而为贝氏体相变机制的深入研究提供了重要实验基础，在此基础上给出了Ｃｕ－Ｚｎ－Ａｌ合金中贝氏体的结构模型。     

Ti－1023合金拉伸试验的电镜原位观察

用扫描电镜和透射电镜原位观测了Ｔｉ－１０Ｖ－２Ｆｅ－３Ａｌ合金经固溶处理获得亚稳定β相后在拉伸过程中α″相的形成、长大及裂纹的萌生与扩展，以及最终断裂过程．并采用ＤＩＣ金相方法方便地区分滑移线和α″相．     

Ti－1023合金拉伸试验的电镜原位观察SCIEI

用扫描电镜和透射电镜原位观测了Ｔｉ－１０Ｖ－２Ｆｅ－３Ａｌ合金经固溶处理获得亚稳定β相后在拉伸过程中α″相的形成、长大及裂纹的萌生与扩展，以及最终断裂过程．并采用ＤＩＣ金相方法方便地区分滑移线和α″相．     

扫描隧道显微镜研究Cu－Zn－Al合金中贝氏体及其浮突

用扫描隧道显微镜（ＳＴＭ）在大气中研究了Ｃｕ－２７．２Ｚｎ－４．７Ａｌ合金中贝氏体的精细结构及浮突形态。在浮突和腐蚀后的组织上都发现，Ｃｕ－Ｚｎ－Ａｌ合金中的贝氏体确是由亚片条和亚单元所组成，进而为贝氏体相变机制的深入研究提供了重要实验基础。在此基础上给出了Ｃｕ－Ｚｎ－Ａｌ合金中贝氏体的结构模型。     

铝,硅共渗提高γ／γ′—α—Mo定向共晶合金抗氧…

用ＸＲＤ、ＥＰＭＡ、ＳＥＭ、天平等分析手段，对γ／γ′－α－Ｍｏ定向共晶合金共渗Ａｌ、Ｓｉ前后、氧化前后的金相组织、相组成、氧化产物等进行了分析。对实验结果进行了讨论。采用粉末包埋Ａｌ、Ｓｉ共渗方法，在γ／γ′－αＭｏ定向共晶合金表面可形成抗氧化ＮｉＡｌ、Ｍｏ（Ａｌ、Ｓｉ）２相。在１０００℃、１１００℃空气中氧化时，Ｍｏ（Ａｌ，Ｓｉ）２相由氧化前的纤维状向不连续的、弥散的颗粒状转变，进一步提高了合     

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。     

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.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

Formulas of Tension of Continuous Rolling Process

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.