不同结构及成分的Al3Ti合金成键特征的分析

利用Ｘ射线光电子能谱法分析了Ａｌ３Ｔｉ系合金的成键性质。Ｄ０２２型Ａｌ３Ｔｉ成键性质的各向异性有利于稳定Ｄ０２２结构，Ｌｌ２型Ａｌ３Ｔｉ成键方式呈各向同性。Ａｌ６７Ｔｉ２５Ｍｎ８合金中Ａｌ－Ｔｉ键与Ａｌ６７Ｔｉ２５Ｎｉ８合金相比具有球化程度高，方向性小的特点，有利于提高塑性。     

Pd—Ni—Al涂层的循环氧化和在Na2SO4熔盐中的热腐蚀行为

研究了底温高活性（ＨＴＨＡ）Ｐｄ－Ｎｉ－Ａｌ涂层在１０５０℃人的循环氧化和Ｎａ２ＡＳＯ４熔盐中的热腐蚀结果表明,Ｐｄ－Ｎｉ－Ａｌ涂层表面生成一层致密的氧化膜,抗热腐蚀性能接近Ｐｔ－Ａｌ涂层,优于单渗铝涂层,初步分析了Ｐｄ－Ｎｉ－Ａｌ涂层的高温腐蚀机理。     

Ni_3Al基合金的初期氧化速率

用感量为２μｇ的Ｓｅｔａｒａｍ热天平研究了Ｎｉ３Ａｌ及Ｎｉ３Ａｌ－Ｃｒ基合金７００℃～１１００℃的初期氧化行为。Ｎｉ３Ａｌ合金在中温区（７０００℃～９００℃）的氧化,随温度升高初期氧化速率明显增加（氧化５ｍｉｎ）,８００℃及９００℃氧化０．５ｈ后试样的氧化增重低于７００℃的。在温度低于９００℃时,Ｎｉ３Ａｌ－Ｃｒ基合金的氧化增重明显小于Ｎｉ３Ａｌ基合金;高于１０００℃时,其氧化增重明显大于Ｎｉ３Ａｌ基合金的。ＥＤＳ分析表明Ｎｉ３Ａｌ－Ｃｒ基合金表面不出现纯ＮｉＯ相的氧化物区。加Ｃｒ可降低Ｎｉ３Ａｌ的晶格常数,增加原子密堆度,从而阻碍Ｎｉ原子的扩散,降低合金的氧化速率。     

包覆钯和镍后MnNi5基贮氢合金的电化学特性

测定了包覆１０ｗｔ％Ｐｄ－Ｎｉ后Ｍｍ０．９Ｔｉ０．１Ｎｉ３．９Ｍｎ０．４Ｃｏ．４Ａｌ０．３合金，及由其制成Ｎｉ－ＭＨ电池的电化学特性。包覆Ｐｄ－Ｎｉ的贮氢合金电极２００次循环后容量仅衰减３％。负极为合金包覆Ｐｄ－Ｎｉ的Ｎｉ－ＭＨ电池在０．４Ｃ放电时的平均放电电压为１．２７Ｖ。在３Ｃ放电时的放电容量为０．４Ｃ的７６％。     

温度与加载波形对Ni3Al（B）疲劳—蠕变裂纹扩展行为的影响

在不同加载波形及温度下研究Ｎｉ３Ａｌ（Ｂ）的疲劳－蠕变裂纹扩展行为，结果表明，加载波形对高温疲劳－蠕变裂纹扩展速率及断裂行为有强烈影响，拉伸保持时间的叠加明显增加合金高温下的蠕裂纹扩展速率，与高速合金相比，Ｎｉ３Ａｌ（Ｂ）在６００和８００℃下的裂纹尖端氧脆及疲劳－蠕变交互作用更为明显，裂纺展速率随温度发生明显变化，Ｂ在高温下对Ｎｉ３Ａｌ（Ｂ）的韧化作用与温度和加载波形有关。     

包覆钯和镍后M_mNi_5基贮氢合金的电化学特性

测定了包覆１０ｗｔ％Ｐｄ－Ｎｉ后Ｍｍ０．９Ｔｉ０．１Ｎｉ３．９Ｍｎ０．４Ｃｏ０．４Ａｌ０．３合金，及由其制成Ｎｉ－ＭＨ电池的电化学特性。包覆Ｐｄ—Ｎｉ的贮氢合金电极２００次循环后容量仅衰减３％。负极为合金包覆Ｐｄ—Ｎｉ的Ｎｉ－ＭＨ电池在０．４Ｃ放电时的平均放电电压为１．２７Ｖ。在３Ｃ放电时的放电容量为０．４Ｃ时的７６％。     

Ni74.5Pd2Al23.5有序合金中的超点阵内禀层错

应用ＴＥＭ研究了Ｌ１２长程有序结构Ｎｉ７４．５Ｐｄ２Ａｌ２３．５合金的室温变形组织。研究结果表明：添加Ｐｄ元素韧化的Ｎｉ７４．５Ｐｄ２Ａｌ２３．５合金的变形组织中存在着大量超点阵内禀层错。绝大部分层错的边界位错是沿〈０１１〉分布的肖克莱偏位错环,其中３０°的ａ／３〈１１２〉超肖克莱位错处于固定状态。这类位错的可动性较差,但其固定程度较合金中普遍存在的ＫｅａｒＷｉｌｓｄｏｒｆ固定位错要弱。     

金属间化合和Ni3Al微结构的AP—FIM研究

用原子探针场离子显微镜（ＡＰ－ＦＩＭ）研究了添加Ｂ对Ｎｉ３Ａｌ有序度的影响以及不同Ｎｉ／Ａｌ比时Ｎｉ３Ａｌ场离子像衬度的变化。无Ｂ的Ｎｉ３Ａｌ样品中晶内出现富Ｎｉ区,且Ｎｉ富集程度的不同而影响场离子像的衬度。在Ｎｉ３Ａｌ样品中,Ｂ的添加会影响Ｎｉ３Ａｌ晶体的择优取向。随Ｂ含量的增加,Ｎｉ３Ａｌ中占据反位置的Ａｌ原子增多,有序度降低,Ｎｉ３Ａｌ样品有序度的降低是改善室温延展性的原因之一。     

Mg,Ca,Y,La和Ce在Ni3Al中的合金化行为

利用Ｘ射线衍射法确定了合金元素Ｍｇ，Ｃａ，Ｙ，Ｌａ及Ｃｅ在Ｎｉ３Ａｌ中的合金化行为。结果表明，Ｍｇ，Ｃａ，Ｙ，Ｌａ及Ｃｅ原子占据Ｎｉ３Ａｌ中的Ａｌ位，并按以下顺序增加Ｎｉ３Ａｌ的有序度：Ｍｇ，Ｃａ，Ｙ和Ｌａ－Ｃｅ。随着合金元素含量的增加，Ｎｉ３Ａｌ的点阵常数亦按Ｍｇ，Ｃａ，Ｙ，Ｌａ－Ｃｅ的顺序呈线性增大。     

合金元素对Ni3Al合金抗汽蚀性能的影响

研究了Ｎｉ３Ａｌ合金中ＡＬ,Ｃｒ,Ｆｅ以及Ｍｏ含量对该合金的抗汽蚀性能的影响,结果表明含６％－９％Ａｌ,８％Ｃｒ并用Ｚｒ,Ｂ韧化的Ｎｉ３Ａｌ基合金具有优良的抗汽蚀性能,Ｍｏ和Ｆｅ元素的加入使抗汽蚀性能有一降低２,但仍不失为较好的抗汽蚀材料。     

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.     

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.     

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.     

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.