Volume 0,Issue 1,1999 Table of Contents
1999(1).
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.
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.
1999(1):1-4.
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
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
1999(1):5-9.
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.
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.
1999(1):10-13.
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.
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.
1999(1):14-17.
Abstract:
颗粒增强金属基复合材料的强化来自载荷转移强化和基体强化两个方面。在复合材料中适量添加小尺寸的粒子，特别是小于１μｍ的刚性粒子，则可在Ｏｒｏｗａｎ强化、细化晶粒尺寸和提高基体加工硬化率等方面对复合体基体强化项做出贡献，提高复合材料的总强度。ＴＥＭ用于观察和分析了这种复合材料的显微组织特征。并对小粒子的强化机制也进行了讨论。
颗粒增强金属基复合材料的强化来自载荷转移强化和基体强化两个方面。在复合材料中适量添加小尺寸的粒子，特别是小于１μｍ的刚性粒子，则可在Ｏｒｏｗａｎ强化、细化晶粒尺寸和提高基体加工硬化率等方面对复合体基体强化项做出贡献，提高复合材料的总强度。ＴＥＭ用于观察和分析了这种复合材料的显微组织特征。并对小粒子的强化机制也进行了讨论。
1999(1):18-21.
Abstract:
合成了Ｒ３（Ｆｅ，Ｍｏ）２９（Ｒ＝Ｓｍ，Ｙ）化合物并在０．１ＭＰａ氮气条件下通过气相氮化法制备出其氮化物。Ｒ３（Ｆｅ，Ｍｏ）２９金属间化合物氮化后仍保持母相结构，但是晶胞体积发生膨胀，氮化处理同时导致化合物居里温度Ｔｃ和饱和磁化强度σｓ升高同时Ｓｍ３（Ｆｅ，Ｍｏ）２９化合物由平面各向异性变为单轴各向异性，但Ｙ３（Ｆｅ，Ｍｏ）２９Ｎｘ化合物的各向异性仍与母相相同，为面各向异性。
合成了Ｒ３（Ｆｅ，Ｍｏ）２９（Ｒ＝Ｓｍ，Ｙ）化合物并在０．１ＭＰａ氮气条件下通过气相氮化法制备出其氮化物。Ｒ３（Ｆｅ，Ｍｏ）２９金属间化合物氮化后仍保持母相结构，但是晶胞体积发生膨胀，氮化处理同时导致化合物居里温度Ｔｃ和饱和磁化强度σｓ升高同时Ｓｍ３（Ｆｅ，Ｍｏ）２９化合物由平面各向异性变为单轴各向异性，但Ｙ３（Ｆｅ，Ｍｏ）２９Ｎｘ化合物的各向异性仍与母相相同，为面各向异性。
1999(1):22-25.
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.
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.
1999(1):26-29.
Abstract:
详细观察了钛／钢爆炸焊接界面区内的变形组织特征，研究了复合板的钢侧塑性变形层和钛侧绝热剪切线与焊接工艺参数的关系。结果表明，过大或过小的变形层都将导致界面区内产生有害缺陷。合理的变形层宽度应控制在５０μｍ￣２００μｍ之间，绝热剪切线长度不宜超过１０００μｍ。
详细观察了钛／钢爆炸焊接界面区内的变形组织特征，研究了复合板的钢侧塑性变形层和钛侧绝热剪切线与焊接工艺参数的关系。结果表明，过大或过小的变形层都将导致界面区内产生有害缺陷。合理的变形层宽度应控制在５０μｍ￣２００μｍ之间，绝热剪切线长度不宜超过１０００μｍ。
1999(1):34-37.
Abstract:
系统研究了Ｓｉ置换部位Ｆｅ的Ｓｍ２Ｆｅ１７ｘＳｉｘ（ｘ＝０，１，２，３）化合物及其氢化物的磁性能。首次发现Ｓｍ２（Ｆｅ，Ｓｉ）１７化合物对应的氢化物升温时测得的居里温度比降温时测得的居高温度高，其差值为ΔＴｃ＾＊。详细讨论了ΔＴｃ＾＊与Ｓｍ２（Ｆｅ，Ｓｉ）１７化合物及其氢化物的结构稳定性的关系。
系统研究了Ｓｉ置换部位Ｆｅ的Ｓｍ２Ｆｅ１７ｘＳｉｘ（ｘ＝０，１，２，３）化合物及其氢化物的磁性能。首次发现Ｓｍ２（Ｆｅ，Ｓｉ）１７化合物对应的氢化物升温时测得的居里温度比降温时测得的居高温度高，其差值为ΔＴｃ＾＊。详细讨论了ΔＴｃ＾＊与Ｓｍ２（Ｆｅ，Ｓｉ）１７化合物及其氢化物的结构稳定性的关系。
1999(1):38-40.
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.
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.
1999(1):41-45.
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.
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.
1999(1):46-49.
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.
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.
1999(1):50-52.
Abstract:
结合铝的表面处理和铜的生箔对阳极的要求，针对Ｔｉ／ＩｒＯ２阳极，用热差分析、电极极化、Ｘ光衍射及强化寿命试验，研究了热氧化处理温度以阳有有的热分析曲线、电极电位、相结构和强化寿命的影响。在３０％Ｈ２ＳＯ４（质量比），４Ａ／ｃｍ＾２，４０℃±５℃下的强化寿命实验表明：小于５００℃时，阳极的寿命受涂层的溶蚀控制。大于６００℃，阳极的破坏形式以涂层脱落为主，而涂层在５００℃￣６００℃之间处理的阳极的强化
结合铝的表面处理和铜的生箔对阳极的要求，针对Ｔｉ／ＩｒＯ２阳极，用热差分析、电极极化、Ｘ光衍射及强化寿命试验，研究了热氧化处理温度以阳有有的热分析曲线、电极电位、相结构和强化寿命的影响。在３０％Ｈ２ＳＯ４（质量比），４Ａ／ｃｍ＾２，４０℃±５℃下的强化寿命实验表明：小于５００℃时，阳极的寿命受涂层的溶蚀控制。大于６００℃，阳极的破坏形式以涂层脱落为主，而涂层在５００℃￣６００℃之间处理的阳极的强化
1999(1):53-55.
Abstract:
用ＸＲＤ和ＳＥＭ研究了在真空中频感应炉中熔制的Ｎｄ１３Ｆｅ８１．５Ｂ５．５合金在受热和非受热条件下的吸氢特点、吸氢产物的相组成和微结构，结果表明，该合金吸氢产物主相为ＮｄＨ２．９和α－Ｆｅ，并有微量Ｆｅ２Ｂ和Ｆｅ２Ｎｄ。非受热吸氢合金中，ＮｄＨ２．９在富钕的晶界上形成；受热吸氢合金则在晶界和晶粒内部都可形成ＮｄＨ２．９。实验得出：７７０℃下吸氢３ｈ可获得高质量钕的氢化物。
用ＸＲＤ和ＳＥＭ研究了在真空中频感应炉中熔制的Ｎｄ１３Ｆｅ８１．５Ｂ５．５合金在受热和非受热条件下的吸氢特点、吸氢产物的相组成和微结构，结果表明，该合金吸氢产物主相为ＮｄＨ２．９和α－Ｆｅ，并有微量Ｆｅ２Ｂ和Ｆｅ２Ｎｄ。非受热吸氢合金中，ＮｄＨ２．９在富钕的晶界上形成；受热吸氢合金则在晶界和晶粒内部都可形成ＮｄＨ２．９。实验得出：７７０℃下吸氢３ｈ可获得高质量钕的氢化物。
1999(1):56-59.
Abstract:
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
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
1999(1):60-62.
Abstract:
在酸性条件下痕量Ａｇ（Ｉ）对Ｋ４［Ｆｅ（ＣＮ）６０３６１－尿素间的配体交换反应具有显著的催化效应，催化反应的表观活化能为１８．１２ｋＪ·ｍｏｌ＾－１。本文据此建立了测定痕量银的配体交换动力学分析法，测定条件为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℃。线性测定范围为１０
在酸性条件下痕量Ａｇ（Ｉ）对Ｋ４［Ｆｅ（ＣＮ）６０３６１－尿素间的配体交换反应具有显著的催化效应，催化反应的表观活化能为１８．１２ｋＪ·ｍｏｌ＾－１。本文据此建立了测定痕量银的配体交换动力学分析法，测定条件为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℃。线性测定范围为１０
