用Nb,TiNb连续纤维增韧的TiAl基复合材料

用粉末热压工艺和框架纤维缠绕方法制备出了Ｎｂ和ＴｉＮｂ连续纤维增韧的ＴｉＡｌ基复合材料。检测并研究了纤维和基体复合效果,界面反应层及复合材料组织和相的变化;研究了复合材料组织、相和界面与增韧的关系,提出了一些连续纤维对ＴｉＡｌ基复合材料的增韧机制。结果发现,复合材料纤维和基体界面结合良好,ＴｉＮｂ和Ｎｂ连续纤维复合材料的ＫＩｃ值分别达３７ＭＰａ·ｍ＾１／２和３３ＭＰａ·ｍ＾１／２,均比基体Ｔｉ４８     

颗粒增强铝基复合材料的组织与性能

用熔铸法制备了ＴｉＢ２和ＳｉＣ颗粒增强铝基复合材料,评价了ＴｉＢ２／Ａｌ和ＳｉＣ／Ａｌ复合材料的硬度,研究了增强剂的加入方式和体积分数对ＴｉＢ２／Ａｌ复合材料拉伸性能的影响;并用扫描电镜分析了复合材料的显微组织。结果表明,ＴｉＢ２颗粒对Ａｌ基体的增强效果比ＳｉＣ颗粒好,Ｔｉ,Ｂ化合物的增强效果优于ＴｉＢ２粉末,复合材料的力学性能随ＴｉＢ２体积分数增加而提高;用含Ｔｉ,Ｂ化合物的混合物增强的１．５％ＴｉＢ２／Ａｌ（体积分数）复合材料的热轧退火态性能为σｂ１６０．４ＭＰａ,δ１３．１％,铸态ＨＢ４５１ＭＰａ。ＳＥＭ观察结果表明,在铝基体中添加Ｔｉ、Ｂ化合物的混合物能在基体中原位生成ＴｉＢ２颗粒。     

盐类反应制备TiB2／Al—4.5Cu复合材料的研究

采用Ｋ２ＴｉＦ６和ＫＢＦ４混合盐反应法制备ＴｉＢ２／Ａｌ－４．５Ｃｕ复合材料，通过ＳＥＭ，ＸＲＤ及ＭＴＳ等仪器研究了复合材料的凝固组织和力学性能。增强相ＴｉＢ２颗粒细小（＜２μｍ），呈近球形，均匀分布于基体之中，起强化和细化基体作用，ＴｉＢ２颗粒与基体结合好。当Ｋ２ＴｉＦ６和ＫＢＦ４混合物加入质量为基体的２０％时，复合材料的综合性能最好。ＵＴＳ达３５２ＭＰａ，ＥＬ达４．４％，ＨＢ达１４６。     

液态反应法制备TiCp增强铸造Fe—Cr—Ni基复合材料

研究了利用液反应法制备的ＴｉＣ颗粒（ＴｉＣ）增强铸造Ｆｅ－Ｃｒ－Ｎｉ基复合材料的显微结构和力学性能,该复合材料主要由γ基体和均匀分布和尺寸为１－５μｍ的球状或多面体状ＴｉＣｐ组成,γ／ＴｉＣｐ界面洁净,两相造近界面的区域内均存在高密度位错,（Ｔｉ＋Ｃ）加入量（质量分数）为３－６％时复合材料的常温和高温拉伸性能比基体合金明显提高,其拉伸断口在８００℃时仍能保持韧性断裂特征。     

熔铸-原位反应喷射成形金属基复合材料制备新技术

研究开发了一种喷射成形金属基复合材料制备新技术———熔铸－ 原位反应喷射成形技术。该技术的突出优点是： 解决了颗粒损失和颗粒在合金基体中分布不均匀的问题; 合金的熔炼、颗粒的生成以及喷射成形金属基复合材料的制备同步进行, 明显缩短了复合材料的制备工艺流程, 降低了材料的制备成本。利用该技术制备了３ ％ ＴｉＣ／Ａｌ 复合材料。研究表明, ＴｉＣ 颗粒在铝基体中分布均匀, 制备的３ ％ ＴｉＣ／Ａｌ 复合材料组织致密     

高温反应烧结制备Al2O3-TiC/Al原位复合材料

以ＡｌＴｉＯ２反应体系为基础,添加适量石墨粉,压制后在不同温度下进行反应烧结,从而确定了获得反应完全的Ａｌ２Ｏ３ＴｉＣ／Ａｌ铝基复合材料的烧结工艺参数,并对该复合材料的组织性能及反应机理进行了分析讨论。结果表明：碳的加入可完全抑制条状和大块状Ａｌ３Ｔｉ相的形成;ＡｌＴｉＯ２Ｃ体系在１２００℃反应烧结后,可制得硬度较高的Ａｌ２Ｏ３ＴｉＣ／Ａｌ原位复合材料,其显微组织中Ａｌ２Ｏ３和ＴｉＣ颗粒尺寸小于２μｍ。     

颗粒TiC增强铸造Fe—Cr—Ni基复合材料的制备工艺和显微组织

用液态反应合成法制备了颗粒ＴｉＣ增强铸造Ｆｅ－２８Ｃｒ－１２Ｎｉ基复合材料，探讨了工艺参数对显微组织的影响，结果表明，该复合材料由０．２￣５μｍ的多面体形ＴｉＣ颗粒和α－Ｆｅ基体组成，ＴｉＣ分布均匀弥散，无连接现象。     

原位TiC／金属基激光熔覆涂层的微结构特征

利用激光熔覆制备了原位形成ＴｉＣ陶瓷颗粒增强金属基复合材料涂层,ＴｉＣ为熔覆时原位形成。颗粒细小弥散,具有内晶型及密度梯度分布特征;ＨＲＥＭ观察表明,ＴｉＣ／基体界面结构具有洁净及微晶过渡特征,无界面反应物;熔覆组织具有较高的显微度及耐磨性。     

原位TiC颗粒增强Al-Cu复合材料的组织及性能

以Ｔｉ,Ａｌ和Ｃ粉末为原料,采用接触反应法制备原位ＴｉＣ颗粒增强的铸造ＡｌＣｕ复合材料,研究了反应温度对反应产物的影响,探讨了ＴｉＣ颗粒的形成机制。结果表明,随着反应温度的升高,副产物ＴｉＡｌ３和Ａｌ４Ｃ３生成的可能性减小;当反应温度为９００℃时,反应副产物全部转变为ＴｉＣ,且原位反应生成０．５～１．５μｍ的ＴｉＣ颗粒均布于αＡｌ基体中;ＴｉＣ的加入能显著提高基体的强度,特别是高温强度,但使其延伸率有所下降。     

熔铸—原位反应喷射成形金属基复合材料制备新技术

研究开发了一种喷射成形金属基复合材料制备新技术－－熔铸原位反应喷射成形技术,该技术的突出优点是：解决了粒损失和颗粒在合金基体中分布不均匀的问题;合金的熔炼、颗粒的生成以及喷射成形金属基复合材料的制备同步进行,明显缩短了复合材料的制备工艺流程,降低了材料的制备成本,利用该技术制备了３％ＴｉＣ／Ａｌ复合材料。研究表明,ＴｉＣ颗粒在铝基体中分布均匀,制备的３％ＴｉＣ／Ａｌ复全材料组织致密。     

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.