Volume 0,Issue 3,1994 Table of Contents
1994(3).
Abstract:
用自制的液体自动循环装置，在室温下对Ｔｉ－７５合金进行了腐蚀疲劳性能的试验研究。结果表明，Ｔｉ－７５合金在大气、３．５Ｗｔ％ＮａＣｌ溶液条件下，在１×１０７周次下的疲劳极限为３９２ＭＰａ和４３１ＭＰａ。并在大气，３．５ｗｔ％ＮａＣｌ条件下，对Ｔｉ－７５和ＴＡ５的抗腐蚀疲劳性能进行对比研究，发现Ｔｉ－７５比ＴＡＳ分别提高了２９％和２６％。提高原因与合金显微组织等密切相关。
用自制的液体自动循环装置，在室温下对Ｔｉ－７５合金进行了腐蚀疲劳性能的试验研究。结果表明，Ｔｉ－７５合金在大气、３．５Ｗｔ％ＮａＣｌ溶液条件下，在１×１０７周次下的疲劳极限为３９２ＭＰａ和４３１ＭＰａ。并在大气，３．５ｗｔ％ＮａＣｌ条件下，对Ｔｉ－７５和ＴＡ５的抗腐蚀疲劳性能进行对比研究，发现Ｔｉ－７５比ＴＡＳ分别提高了２９％和２６％。提高原因与合金显微组织等密切相关。
1994(3).
Abstract:
采用Ｘ射线衍射术和ＯＤＦ研究了再结晶退火对Ｎｉ４７Ｔｉ４４Ｎｂ９合金冷轧板相组成和织构的影响。结果表明，冷轧板材的相组成为Ｂ２＋β－Ｎｂ＋Ｂ１９＇；织构类型为面织构｛００１｝ｐ＋｛１１０｝ｐ再结晶退火期间，马氏体相Ｂ１９＇逆转变为母相Ｂ２，合金的相组成为：Ｂ２十β－Ｎｂ，而再结晶织构为：｛００１｝＜１１０＞ｐ。
采用Ｘ射线衍射术和ＯＤＦ研究了再结晶退火对Ｎｉ４７Ｔｉ４４Ｎｂ９合金冷轧板相组成和织构的影响。结果表明，冷轧板材的相组成为Ｂ２＋β－Ｎｂ＋Ｂ１９＇；织构类型为面织构｛００１｝ｐ＋｛１１０｝ｐ再结晶退火期间，马氏体相Ｂ１９＇逆转变为母相Ｂ２，合金的相组成为：Ｂ２十β－Ｎｂ，而再结晶织构为：｛００１｝＜１１０＞ｐ。
1994(3):1-5.
Abstract:
heories and experiments relating to reverse-domain nuclation and domain wall pinning in NdFeB Permanent magnets are reviewed.Though both coercivity mechanism are still under investigation, it is clear that the Nd-rich phase and the grain boundary structure play an important role in enhancing coercivity in NdFeB magnets,which is discussed.
heories and experiments relating to reverse-domain nuclation and domain wall pinning in NdFeB Permanent magnets are reviewed.Though both coercivity mechanism are still under investigation, it is clear that the Nd-rich phase and the grain boundary structure play an important role in enhancing coercivity in NdFeB magnets,which is discussed.
1994(3):7-12.
Abstract:
The avdance in applications of niobium as alloying elements in steel, copper and Ti-based alloys has been brienfly reviewed. The progresses in applications and developments of Nb-based superalloy, oxidation resistance Nb-based alloy, Nb-matrix composite and niobic acid catalysts have been also introduced.
The avdance in applications of niobium as alloying elements in steel, copper and Ti-based alloys has been brienfly reviewed. The progresses in applications and developments of Nb-based superalloy, oxidation resistance Nb-based alloy, Nb-matrix composite and niobic acid catalysts have been also introduced.
1994(3):17-22.
Abstract:
利用ＳＥＭ，ＴＥＭ技术对Ａｌ_２Ｏ_３ｐ，ＳｉＣ_ｐ增强纯铝基复合材料进行了组织观察和分析，认为陶瓷颗粒的加入使材料的σ_ｂ，σ_（０．２）提高了，但延伸率有所下降；指出颗粒强化的位错机制不能用单一的Ｏｒｏｗａｎ机制来解释，还应考虑位错胞状亚结构的影响，并认为强度σ_ｃ＝ｆ（ｍ，Ｐ，ｄｐ，Ｖｐ，Φ，，Ｉ）经拟合得出本研究条件下的
利用ＳＥＭ，ＴＥＭ技术对Ａｌ_２Ｏ_３ｐ，ＳｉＣ_ｐ增强纯铝基复合材料进行了组织观察和分析，认为陶瓷颗粒的加入使材料的σ_ｂ，σ_（０．２）提高了，但延伸率有所下降；指出颗粒强化的位错机制不能用单一的Ｏｒｏｗａｎ机制来解释，还应考虑位错胞状亚结构的影响，并认为强度σ_ｃ＝ｆ（ｍ，Ｐ，ｄｐ，Ｖｐ，Φ，，Ｉ）经拟合得出本研究条件下的
1994(3):23-26.
Abstract:
用三点弯曲法研究了金属间化合物γ－ＴｉＡｌ和用塑性Ｔｉ纤维韧化的Ｔｉ／ＴｉＡｌ复合材料的弯曲性能；利用Ｘ射线衍射仪，光学显微镜、扫描电镜研究了它们的相组成，并分析了Ｔｉ／ＴｉＡｌ复合材料弯曲性能和界面相之间的关系。结果表明：Ｔｉ／ＴｉＡｌ复合材料的弯曲强度提高了２２．５％，挠度提高不明显，有明显韧化的效果。复合材料中Ｔｉ３Ａｌ、Ｔｉ２Ａｌ等金属间化合物相析出，是它塑性没有明显优化的原因。
用三点弯曲法研究了金属间化合物γ－ＴｉＡｌ和用塑性Ｔｉ纤维韧化的Ｔｉ／ＴｉＡｌ复合材料的弯曲性能；利用Ｘ射线衍射仪，光学显微镜、扫描电镜研究了它们的相组成，并分析了Ｔｉ／ＴｉＡｌ复合材料弯曲性能和界面相之间的关系。结果表明：Ｔｉ／ＴｉＡｌ复合材料的弯曲强度提高了２２．５％，挠度提高不明显，有明显韧化的效果。复合材料中Ｔｉ３Ａｌ、Ｔｉ２Ａｌ等金属间化合物相析出，是它塑性没有明显优化的原因。
1994(3):33-39.
Abstract:
测定了锆－２．５Ｗｔ％铌合金在冷变形量为２０％，５０％及４００℃退火后的板织构，计算了织构系数，讨论了织构形成、发展与工艺的关系。结果表明，冷加工变形量越大，织构越强烈；冷加工变形织构在４００℃／２４ｈ退火后不仅不会消失，反而会得到加强，这是由于择优取向的亚晶在退火回复过程中变得更加完整的原因。
测定了锆－２．５Ｗｔ％铌合金在冷变形量为２０％，５０％及４００℃退火后的板织构，计算了织构系数，讨论了织构形成、发展与工艺的关系。结果表明，冷加工变形量越大，织构越强烈；冷加工变形织构在４００℃／２４ｈ退火后不仅不会消失，反而会得到加强，这是由于择优取向的亚晶在退火回复过程中变得更加完整的原因。
1994(3):45-48.
Abstract:
The effect of Mo element in ceramets has been analysed. The appropriate adding contents of Mo element in ceramets with high content of nickel have been studied. The results show that the optimum contents of Mo element in 40Ni ceramet and 30Ni ceramet are 13wt.% and 15wt%, respectively. The addition of Mo element thickened the size of circular phase and increased the contents of Ti Mo and W,solid-solved in stick phase.
The effect of Mo element in ceramets has been analysed. The appropriate adding contents of Mo element in ceramets with high content of nickel have been studied. The results show that the optimum contents of Mo element in 40Ni ceramet and 30Ni ceramet are 13wt.% and 15wt%, respectively. The addition of Mo element thickened the size of circular phase and increased the contents of Ti Mo and W,solid-solved in stick phase.
1994(3):49-54.
Abstract:
his paper presents the production technique of Si3N4/ SiC composite powder by carbothermic reduction of silica. The influences of process parameters, such as reaction temperature, time, original powder property, the ratio of SiO2/ C, the flowing rate of N2 and the adding amount of Si3N4, on the production properties are discussed. It has been found that the raising of reaction temperature,prolonging of reaction time, increasing of specific surface of original SiO2 powder,the ratio of SiO2 / C and the flowing rate of N2,are of advantage for the forming of Si3N4 and SiC phase.The ultrafine powder has been produced by controling each process condition at the same time.
his paper presents the production technique of Si3N4/ SiC composite powder by carbothermic reduction of silica. The influences of process parameters, such as reaction temperature, time, original powder property, the ratio of SiO2/ C, the flowing rate of N2 and the adding amount of Si3N4, on the production properties are discussed. It has been found that the raising of reaction temperature,prolonging of reaction time, increasing of specific surface of original SiO2 powder,the ratio of SiO2 / C and the flowing rate of N2,are of advantage for the forming of Si3N4 and SiC phase.The ultrafine powder has been produced by controling each process condition at the same time.
1994(3):55-58.
Abstract:
运用ＰＶＤ工艺在Ｍ２高速钢表面沉积了（ＴｉＡｌ）Ｎ涂层，用ＳＥＭ、ＴＥＭ和ＸＲＤ方法对涂层显微组织和结构进行了分析研究，并对涂层的性能进行测试。结果表明，涂层的显微硬度和耐磨性随涂镀时基体温度上升而提高，在ＴＳ＝４８０℃时涂镀效果较佳；也随涂镀时的氮流量有关系，当Ｎｆ＝１２ｍｌ．ｍｉｎ－１时，Ｈｖ可达２４００。
运用ＰＶＤ工艺在Ｍ２高速钢表面沉积了（ＴｉＡｌ）Ｎ涂层，用ＳＥＭ、ＴＥＭ和ＸＲＤ方法对涂层显微组织和结构进行了分析研究，并对涂层的性能进行测试。结果表明，涂层的显微硬度和耐磨性随涂镀时基体温度上升而提高，在ＴＳ＝４８０℃时涂镀效果较佳；也随涂镀时的氮流量有关系，当Ｎｆ＝１２ｍｌ．ｍｉｎ－１时，Ｈｖ可达２４００。
1994(3):59-64.
Abstract:
he influence of alloying composition on the mechanical properties of Ti811 alloy rods was studied.The results show that the mechanical properties of Ti811 alloy are subject to alloying. composition.These properties include tensile properties at room temperature and high temperature,thermal stability, impact elasticity, creep properties and netched lasting properties.The variety of microstructures was investigated with the help of TEM and SEM techniques.
he influence of alloying composition on the mechanical properties of Ti811 alloy rods was studied.The results show that the mechanical properties of Ti811 alloy are subject to alloying. composition.These properties include tensile properties at room temperature and high temperature,thermal stability, impact elasticity, creep properties and netched lasting properties.The variety of microstructures was investigated with the help of TEM and SEM techniques.
1994(3):65-68.
Abstract:
Bulided the method for determining carbon in the neodymium.The mounts of sample,flux,temperature, oxgen flows and obstorption-subltion had been studied and selected.The method has been successfully used in deteminated carbon in the neodymium.
Bulided the method for determining carbon in the neodymium.The mounts of sample,flux,temperature, oxgen flows and obstorption-subltion had been studied and selected.The method has been successfully used in deteminated carbon in the neodymium.
1994(3):69-72.
Abstract:
Some problems may often occur during cutting Ti alloy - the bigger cylindrical error, change of cutting depth owing to thermal expansion of cutting tool and the surface quality defects etc. We make tests and analysis with fine measuring instruments for TC4 and TC9, and give appropriate measures.
Some problems may often occur during cutting Ti alloy - the bigger cylindrical error, change of cutting depth owing to thermal expansion of cutting tool and the surface quality defects etc. We make tests and analysis with fine measuring instruments for TC4 and TC9, and give appropriate measures.
