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Abstract:The microstructural nonuniformity and fatigue properties of welded joints of austenitic alloys are investigated. The microstructural character of the welded Joints is studied using optical metallograph microscope. The experimental results show that the degree of microstructural nonuniformity is highest within the range of the bonded junction, and the fatigue resistance is lowest within the bonded zone. The results of low cycle fatigue test also show that, for the argon are welded 1Cr18Ni9Ti joint, the strain cycling fatigue lifetime of is only about half of that of the base metal, and the fatigue cracks always develop first in the bonded zone of welded joint.

Abstract:The concise developmental process, basic idea and applications of the analytic EAM model are reviewed. The theory, possible execution and attempted modifications to the analytic EAM model are discussed. Some key issues that need to be settled before the EAM model can be applied are also considered

Abstract:The advantages and disadvantages of containerless net shaping of four liquid metals confined by electromagnetics are discussed. A new containerless net shaping procedure for liquid metal confined by high frequency electromagnetics, which combines containerless melting and electromagnetic shpaing, is presented. The principle of this containerless technique is divided into four steps which are described in detail. The shape of the equimagnetic flux density lines is in agreement with the electromagnetically induced shape of the liquid metal. The stability of the electromagnetically shaped of liquid metal is analyzed. Finally, some applications of this containerless technique are introduced.

Abstract:The present status of metal silicides for use as heating elements, high temperature oxidation resistant coatings as well as thin films for largescale integrated circuit applications are reviewed. Some applications problems and solutions to them are discussed. Research and development of the metal silicides as a new type of high temperature structural materials are also overviewed.

Abstract:顆粒增強金屬基復合材料的強化來自載荷轉(zhuǎn)移強化和基體強化兩個方面。在復合材料中適量添加小尺寸的粒子，特別是小于１μｍ的剛性粒子，則可在Ｏｒｏｗａｎ強化、細化晶粒尺寸和提高基體加工硬化率等方面對復合體基體強化項做出貢獻，提高復合材料的總強度。ＴＥＭ用于觀察和分析了這種復合材料的顯微組織特征。并對小粒子的強化機制也進行了討論。

Abstract:合成了Ｒ３（Ｆｅ，Ｍｏ）２９（Ｒ＝Ｓｍ，Ｙ）化合物并在０．１ＭＰａ氮氣條件下通過氣相氮化法制備出其氮化物。Ｒ３（Ｆｅ，Ｍｏ）２９金屬間化合物氮化后仍保持母相結(jié)構(gòu)，但是晶胞體積發(fā)生膨脹，氮化處理同時導致化合物居里溫度Ｔｃ和飽和磁化強度σｓ升高同時Ｓｍ３（Ｆｅ，Ｍｏ）２９化合物由平面各向異性變?yōu)閱屋S各向異性，但Ｙ３（Ｆｅ，Ｍｏ）２９Ｎｘ化合物的各向異性仍與母相相同，為面各向異性。

Abstract:A nanoscale rutile TiO 2 powder has been prepared from TiCl 3. The crystal morphology of TiO 2 powder sintered at various temperatures were studied in detail using XRD and TEM. The results show that there are many morphological differences between nanoscale rutile and common rutile, the former is simplex.

Abstract:詳細觀察了鈦／鋼爆炸焊接界面區(qū)內(nèi)的變形組織特征，研究了復合板的鋼側(cè)塑性變形層和鈦側(cè)絕熱剪切線與焊接工藝參數(shù)的關(guān)系。結(jié)果表明，過大或過小的變形層都將導致界面區(qū)內(nèi)產(chǎn)生有害缺陷。合理的變形層寬度應控制在５０μｍ￣２００μｍ之間，絕熱剪切線長度不宜超過１０００μｍ。

Abstract:系統(tǒng)研究了Ｓｉ置換部位Ｆｅ的Ｓｍ２Ｆｅ１７ｘＳｉｘ（ｘ＝０，１，２，３）化合物及其氫化物的磁性能。首次發(fā)現(xiàn)Ｓｍ２（Ｆｅ，Ｓｉ）１７化合物對應的氫化物升溫時測得的居里溫度比降溫時測得的居高溫度高，其差值為ΔＴｃ＾＊。詳細討論了ΔＴｃ＾＊與Ｓｍ２（Ｆｅ，Ｓｉ）１７化合物及其氫化物的結(jié)構(gòu)穩(wěn)定性的關(guān)系。

Abstract:The effect of a molybdenum net interlayer in the interface between Al 2O 3 and Nb on the shear strength of the brazed joint is investigated. The existence of the net in Al 2O 3/Nb brazed interface could greatly increase the shear strength of the brazed joint. As compared with the fracture of stripped off large pieces of ceramics from the interface of those brazed joints without the molybdenum net interlayer, the fracture of brazed joints with the molybdenum net interlayer changes into a mixed type of fracture occured along the interface. A dividing effect of the net during solidification contraction of the interface greatly decreases the residual stress in the brazed joint. The improvement in the fracture behavior of the brazed joint with molybdenum net interlayer is caused by the dividing effect.

Abstract:The microstructure and properties of hot rolled Ti 24Al 11Nb 2Si and Ti 24Al 11Nb 5Si intermetallic alloys are studied. The results indicate that the precipitate (Ti 5Si 3) in both alloys becomes finer and tends towards a homogeneous distribution with increasing the deformation amount. The larger the deformation amount is, the higher the values of four point bending strength of the alloys at room temperature are. Because larger amout of Ti 5Si 3 exists in Ti 24Al 11Nb 5Si alloy,the bending strength of Ti24Al 11Nb 5Si is higher than that of Ti[ 24Al 11Nb 2Si with increasing the deformation amount. The bending fracture morphologies of both alloys at room temperature show the characteristics of quasicleavage mode, and the bonding strength of phase boundaries is strong. The tensile experiments at high temperature show that the tensile strength and plasticity of Ti 24Al 11Nb 2Si increase with increasing the deformation amount. Because of Ti 24Al 11Nb 5 Si alloy having larger amount of Ti 5Si 3 and larger deformation amount, its tensile strength is much higher than that of Ti 24Al 11Nb 5Si, but its plasticity becomes much lower. The strength of both alloys decreases and their plasticity increases with increasing temperature.

Abstract:Fe TM B( TM =Sn, W, Mo W) alloy deposits have been prepared successfully using electroless plating. The magnetic properties of as plated and heat treated alloy deposits have been studied using vibrating sample magnetometry (VSM). The saturation magnetization of the alloy deposits increases with increasing iron content and decreases with increasing annealing temperature. The coercivities of Fe Sn B and Fe W B alloy deposits decrease to a minimum at 14 9 at.% B and 9 3 at.% B, respectively, and increase continually with increasing annealing temperature for Fe Mo W B. It has been also found that the ratio of remanence to saturation of the alloy deposits is not larger than 0 37 for Fe Sn B and Fe W B, and 0 53 for Fe Mo W B, furthermore it does not increase much even after heat treatment.

Abstract:結(jié)合鋁的表面處理和銅的生箔對陽極的要求，針對Ｔｉ／ＩｒＯ２陽極，用熱差分析、電極極化、Ｘ光衍射及強化壽命試驗，研究了熱氧化處理溫度以陽有有的熱分析曲線、電極電位、相結(jié)構(gòu)和強化壽命的影響。在３０％Ｈ２ＳＯ４（質(zhì)量比），４Ａ／ｃｍ＾２，４０℃±５℃下的強化壽命實驗表明：小于５００℃時，陽極的壽命受涂層的溶蝕控制。大于６００℃，陽極的破壞形式以涂層脫落為主，而涂層在５００℃￣６００℃之間處理的陽極的強化

Abstract:用ＸＲＤ和ＳＥＭ研究了在真空中頻感應爐中熔制的Ｎｄ１３Ｆｅ８１．５Ｂ５．５合金在受熱和非受熱條件下的吸氫特點、吸氫產(chǎn)物的相組成和微結(jié)構(gòu)，結(jié)果表明，該合金吸氫產(chǎn)物主相為ＮｄＨ２．９和α－Ｆｅ，并有微量Ｆｅ２Ｂ和Ｆｅ２Ｎｄ。非受熱吸氫合金中，ＮｄＨ２．９在富釹的晶界上形成；受熱吸氫合金則在晶界和晶粒內(nèi)部都可形成ＮｄＨ２．９。實驗得出：７７０℃下吸氫３ｈ可獲得高質(zhì)量釹的氫化物。

Abstract:用粉末熱壓工藝和框架纖維纏繞方法制備出了Ｎｂ和ＴｉＮｂ連續(xù)纖維增韌的ＴｉＡｌ基復合材料。檢測并研究了纖維和基體復合效果，界面反應層及復合材料組織和相的變化；研究了復合材料組織、相和界面與增韌的關(guān)系，提出了一些連續(xù)纖維對ＴｉＡｌ基復合材料的增韌機制。結(jié)果發(fā)現(xiàn)，復合材料纖維和基體界面結(jié)合良好，ＴｉＮｂ和Ｎｂ連續(xù)纖維復合材料的ＫＩｃ值分別達３７ＭＰａ·ｍ＾１／２和３３ＭＰａ·ｍ＾１／２，均比基體Ｔｉ４８

Abstract:在酸性條件下痕量Ａｇ（Ｉ）對Ｋ４［Ｆｅ（ＣＮ）６０３６１－尿素間的配體交換反應具有顯著的催化效應，催化反應的表觀活化能為１８．１２ｋＪ·ｍｏｌ＾－１。本文據(jù)此建立了測定痕量銀的配體交換動力學分析法，測定條件為Ｋ４［Ｆｅ（ＣＮ）６］：８．０×１０＾－４ｍｏｌ·Ｌ＾－１，［ＣＨ３ＣＯＯＨ］：０．１２ｍｏｌ·Ｌ＾－１，［ＣＯ（ＮＨ２）２］：６．０×１０＾－４ｍｏｌ·ｍｌ＾－１，８０℃。線性測定范圍為１０