Fe—Mn—Ni—Al系铸造合金的低温机械性能研究

本文研究了用于深冷条件下的Ｆｅ－Ｍｎ－Ｎｉ－Ａｌ系合金的化学成分、金相组织和低温机械性能。     

新804铸造合金的研究

本文对铁镍基合金──新８０４ 铸造合金进行了性能研究，使用金相显微镜、Ｘ 射线衍射仪、电子探针仪、扫描电镜研究了合金的金相组织，析出相的化学成分及断 口的微观形貌；采用拉伸和冲击试验测定了合金的机械性能，利用多种耐蚀试验方 法，研究了合金的耐蚀性能。试验结果表明：合金的金相组织为奥氏休和Ｚ相；合金 有良好的机械性能；在高温（１４２－１５０℃）烧碱介质条件下，均匀腐蚀速度为一级， 晶间腐蚀倾向极小，是目前制作抗高温烧碱泵的较好材料。     

多层喷射沉积制备高硅铝合金工艺研究

利用多层喷射沉积装置制备了Al－17Si－2CU－1Mg合金板坯．通过金相观察研究了过热温度和冷却条件对合金板坯显微组织的影响，探讨了基底材料、基底表面温度和沉积板坯的粘附与脱落的关系，提出了合适的工艺条件．     

Fe－Mn－Ni－Al系铸造合金的低温机械性能研究

本文研究了用于深冷条件下的Ｆｅ－Ｍｎ－Ｎｉ－Ａｌ系合金的化学成分、金相组织和低温机械性能．结果表明，Ｆｅ－２２Ｍｎ－３．５Ｎｉ－２．５Ａｌ－０．１Ｃ合金具有稳定的奥氏体组织和良好的机械性能，可用于－１９６℃下工作的低温铸件结构．试验中还发现，夹杂物的含量对降低低温冲击韧性具有显著的影响     

船用螺旋桨新材料──无镍高锰铝青铜的研究

本文介绍一种新型的船用螺旋桨材料——无镍高锰铝青铜（ＺＱＡｌ １３－７－４－３－１）， 包括合金的化学成分、金相组织和性能、缓冷脆性问题的理论分析和诸因素对合金性 能的影响。并介绍了实船试验和生产应用情况。     

添加钇对TiAl合金组织和性能的影响

设计并熔炼了成分为（Ｔｉ５０Ａｌ５０）１００－ｘＹｘ（ａｔｏｍ）＝０－２．０％）的合金，用金相显微镜、扫描电镜、三点弯曲试验等手段，研究了添加钇（Ｙ）对ＴｉＡｌ合金显微组织和力学性能的影响。结果表明：２的添加能改变ＴｉＡｌ合金中Ｏ、Ｎ等间隙原子含量并增加ＴｉＡｌ合金显微组织，使γＴｉＡｌ使合金晶粒细化，促进γ＋α２片层状组织的形成，适量钇的添加能降低ＴｉＡｌ合金中Ｏ、Ｎ等间隙原子含量并增加ＴｉＡｌ     

Al-Ti-B合金线杆生产工艺及细化效果

借助Ｘ射线衍射、扫描电镜、金相显微技术等手段，对采用快速冷凝喷粉或离心制粒－挤压法制得的Ａｌ－Ｔｉ－Ｂ中间合金线杆的组织结构和其晶粒细化效果进行了研究．实验表明，采用这种工艺，中间合金的相组成和相结构并未发生变化；其中ＴｉＡｌ＿３，ＴｉＢ＿２相颗粒的形貌、尺寸、分布等明显改善；晶粒细化效果好。这一结论证实了上述工艺的可行性和先进性，并为ＣＯＮＦＯＲＭ（连续挤压）生产该金属材料开辟了新途径。     

含硅锰母合金烧结钢机理研究

研究了Ｆｅ－６．５％ＳＭ－０．４％Ｃ合金,在１２００℃,分别保温不同时间的烧结过程,分析了烧结水淬试样的金相组织及合金元素Ｍｎ的吸收电子像,结果表明,随着烧结时间的延长,Ｍｎ元素有良好的扩散均匀性,烧结过程可大致分为固－固两相、固－液两相、瞬时液相和固相烧结。     

不同热处理条件下Cu-Zn-Sn合金显微组织研究

文章主要研究了Ｃｕ－Ｚｎ－Ｓｎ合金系列在不同的热处理条件下得到的金相组织形貌。通过选用不同成分配比的试样、不同的加热温度和不同的淬火介质,研究了马氏体形貌的变化,并初步分析了产生不同形貌马氏体的原因和机理     

合金元素微观偏析对车轮组织及断裂韧性的影响

采用金相显微镜(OM)、扫描电子显微镜(SEM)、能谱分析(EDS)、拉伸试验、冲击试验、布氏硬度试验及断裂韧性试验研究了车轮钢中Mn、Si、Cr、V合金元素微观偏析对车轮金相组织和断裂韧性的影响。结果表明,车轮钢金相组织中大尺寸晶粒的存在是断裂韧性值偏低的直接原因。车轮轮辋的金相组织和合金元素微观分布在圆周方向上存在不均匀性,合金元素微观偏析导致了车轮金相组织和断裂韧性的不均匀。优化车轮钢连铸工艺,改善材料组织均匀性是提升车轮断裂韧性及其均匀性的关键。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~