Volume 0,Issue 1,1997 Table of Contents
Tang Huiping Northwest Institute for Nonferrous Metal Research
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P O Box
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Xi''''an Shaanxi
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P R China Zhang Zhengde
1997(1):1-6.
Abstract:
The status of research, production and application of porous metal materials is introduced It is pointed out that the development of porous metal materials should be industrialization on a large scale, and the precision grade of products should be seriation
The status of research, production and application of porous metal materials is introduced It is pointed out that the development of porous metal materials should be industrialization on a large scale, and the precision grade of products should be seriation
2 Thermal Plasticity of Titanium Alloys and Fabrication of Titanium Matrix Composites by Hydrogenation
1997(1):11-18.
Abstract:
研究了氢对典型组织的钛合金相变及高温热塑性的影响，结果表明：加氢可以显著降低α单相及（α＋β）双相组织钛合金的α／β相转变温度，从而可明显增加钛合金在给定温度下显微组织中塑性β相的相对含量，有效提高钛合金的高温热塑性。从而提出了通过对基体加氢来实现降低钛基复合材料制备温度的思路，并在实验上实现了在低于正常制备温度５０℃下完成ＳｉＣ连续纤维增强Ｔｉ－１１００基和Ｔｉ－６Ａｌ－４Ｖ基复合材料的热扩散连
研究了氢对典型组织的钛合金相变及高温热塑性的影响，结果表明：加氢可以显著降低α单相及（α＋β）双相组织钛合金的α／β相转变温度，从而可明显增加钛合金在给定温度下显微组织中塑性β相的相对含量，有效提高钛合金的高温热塑性。从而提出了通过对基体加氢来实现降低钛基复合材料制备温度的思路，并在实验上实现了在低于正常制备温度５０℃下完成ＳｉＣ连续纤维增强Ｔｉ－１１００基和Ｔｉ－６Ａｌ－４Ｖ基复合材料的热扩散连
1997(1):19-21.
Abstract:
Based on solidification analysis in which mechanical properties of quasi-solid alloy and compensation of liquid alloy in dendritic boundries are considered, solidification process of alloy is divided to four stages, which are quasi-liquid stage, compensated stage, uncompensated stage and dendritic bridging stage Hot tearing happened in uncompensated stage In order to investigate hot tearing process, SEMA was carried out for hot cracks in directionally solidified Al-Cu and Renel25 alloys Dendritic bridges were discovered in those cracks And tracks caused by dendritic bridges broken were also discovered in crack sections Therefore, hot tearing is proved to be caused by dendritic bridge breaking and developed through cavities between bridges joining together
Based on solidification analysis in which mechanical properties of quasi-solid alloy and compensation of liquid alloy in dendritic boundries are considered, solidification process of alloy is divided to four stages, which are quasi-liquid stage, compensated stage, uncompensated stage and dendritic bridging stage Hot tearing happened in uncompensated stage In order to investigate hot tearing process, SEMA was carried out for hot cracks in directionally solidified Al-Cu and Renel25 alloys Dendritic bridges were discovered in those cracks And tracks caused by dendritic bridges broken were also discovered in crack sections Therefore, hot tearing is proved to be caused by dendritic bridge breaking and developed through cavities between bridges joining together
1997(1):22-26.
Abstract:
The type of serration is dependent on the strain rates loaded during the serration flow of Al-Li single crystal, which is not correlated to the changes of, critical strain for occurrence of serration with temperatures and strain rate Stress amplitude varies strongly with aging time of serration appeared in series
The type of serration is dependent on the strain rates loaded during the serration flow of Al-Li single crystal, which is not correlated to the changes of, critical strain for occurrence of serration with temperatures and strain rate Stress amplitude varies strongly with aging time of serration appeared in series
1997(1):27-30.
Abstract:
根据工况的需求研究了魏氏组Ｔｉ－３１合金的低周疲劳性能。结果表明，在循环载荷下，Ｔｉ－３１合金表现出很好的循环稳定性，但它是循环软化材料。其裂纹萌生于α与β相界和α板条内，裂纹扩展区内有大量二次裂纹生成。同时还回归出Ｔｉ－３１合金的低周疲劳寿命公式，并指出其过渡寿命ＮＴ为５５６次。比较了具有相同显微魏氏组织的Ｔｉ－３１合金与ＩＭＩ８２９钛合金的低周疲劳性能，二者性能相当。
根据工况的需求研究了魏氏组Ｔｉ－３１合金的低周疲劳性能。结果表明，在循环载荷下，Ｔｉ－３１合金表现出很好的循环稳定性，但它是循环软化材料。其裂纹萌生于α与β相界和α板条内，裂纹扩展区内有大量二次裂纹生成。同时还回归出Ｔｉ－３１合金的低周疲劳寿命公式，并指出其过渡寿命ＮＴ为５５６次。比较了具有相同显微魏氏组织的Ｔｉ－３１合金与ＩＭＩ８２９钛合金的低周疲劳性能，二者性能相当。
1997(1):31-34.
Abstract:
The effect of the homogenization treatment with an electric field on the microstructure of 2091 Al-Li alloy is investigated The results show that the homogenization treatment with an strong electric field promotes the homogenization of Al-Li alloy, increases the solubility of alloying element,induces the homogeneous nucleation of T 1 phase and results in the increasingyield strength In the same time, the strain ageing treatment after the combinedhomogenization treatment increases significently the mechanical properties of 2091 Al-Li alloy because of the uniform and fine second phase precipitation
The effect of the homogenization treatment with an electric field on the microstructure of 2091 Al-Li alloy is investigated The results show that the homogenization treatment with an strong electric field promotes the homogenization of Al-Li alloy, increases the solubility of alloying element,induces the homogeneous nucleation of T 1 phase and results in the increasingyield strength In the same time, the strain ageing treatment after the combinedhomogenization treatment increases significently the mechanical properties of 2091 Al-Li alloy because of the uniform and fine second phase precipitation
1997(1):35-37.
Abstract:
研究了以ＴｉＣ颗粒增强的钛基复合材料的氧化特性。指出ＴｉＣ增强的钛基复合材料在６５０℃以上高温有着其它耐热钛合金不可比拟的高温抗氧化性能；ＴｉＣ／Ｔｉ的反应界面层有利于氧原子的扩散，使复合材料在６５０℃以下的氧化初期氧化速度较快；但在６５０℃以下经长时间保温，其氧化特性和其它耐热钛合金相似。
研究了以ＴｉＣ颗粒增强的钛基复合材料的氧化特性。指出ＴｉＣ增强的钛基复合材料在６５０℃以上高温有着其它耐热钛合金不可比拟的高温抗氧化性能；ＴｉＣ／Ｔｉ的反应界面层有利于氧原子的扩散，使复合材料在６５０℃以下的氧化初期氧化速度较快；但在６５０℃以下经长时间保温，其氧化特性和其它耐热钛合金相似。
1997(1):38-40.
Abstract:
研究了ＢＮｉ－２钎焊条真空吸铸原理，并由试验得出：当ＢＮｉ－２合金加热到１５００℃，真空控制阀门开口为φ６ｍｍ以上，真空度５０ｋＰａ，铸型预热温度５００℃，并用φ内２ｍｍ×５００ｍｍ石英管进行真空吸铸时，吸铸高度可达到４０ｃｍ以上。
研究了ＢＮｉ－２钎焊条真空吸铸原理，并由试验得出：当ＢＮｉ－２合金加热到１５００℃，真空控制阀门开口为φ６ｍｍ以上，真空度５０ｋＰａ，铸型预热温度５００℃，并用φ内２ｍｍ×５００ｍｍ石英管进行真空吸铸时，吸铸高度可达到４０ｃｍ以上。
1997(1):41-43.
Abstract:
The flow behavior of the feedstock of metal injection molding (MIM) is analysized on the basis of general flow curve of material and flow properties of polymer and binder The determination system of viscosity and the parameters of the flow curve of MIM feedstock by capillary rheometer is presented
The flow behavior of the feedstock of metal injection molding (MIM) is analysized on the basis of general flow curve of material and flow properties of polymer and binder The determination system of viscosity and the parameters of the flow curve of MIM feedstock by capillary rheometer is presented
1997(1):44-47.
Abstract:
研究了一种磷酸盐体系绿色稀土荧光粉，它们的化合式为（Ｌａ１－ａ－ｂＴｂａＣｅｂ）２Ｏ３·ｘＰ２Ｏ５·ｙＢ２Ｏ３，其中ａ〉０，ｂ〉０，０．１≤ａ＋ｂ≤０．８，０．５０≤ｘ≤１．３０，０．０１≤ｙ≤０．３０。Ｌａ，Ｔｂ，Ｃｅ的组分及磷硼化合物含量的变化对粉的发光亮度有明显影响。对高温固相反应和还原条件的研究表明：在含碳气氛下，于１１００℃￣１２００℃灼烧是适宜的。
研究了一种磷酸盐体系绿色稀土荧光粉，它们的化合式为（Ｌａ１－ａ－ｂＴｂａＣｅｂ）２Ｏ３·ｘＰ２Ｏ５·ｙＢ２Ｏ３，其中ａ〉０，ｂ〉０，０．１≤ａ＋ｂ≤０．８，０．５０≤ｘ≤１．３０，０．０１≤ｙ≤０．３０。Ｌａ，Ｔｂ，Ｃｅ的组分及磷硼化合物含量的变化对粉的发光亮度有明显影响。对高温固相反应和还原条件的研究表明：在含碳气氛下，于１１００℃￣１２００℃灼烧是适宜的。
1997(1):48-51.
Abstract:
The variations of microhardness with the composition, heat treatment and structure have been studied by measuring microhardness and analyzing X-ray diffraction spectrum for electroless plating Fe-W-B crystallization and Fe-Mo-B amorphous alloys The results show that the microhardness of two alloy systems increases with increasing metalloid B contents, which is opposite to the electronic concentration The microhardness of Fe-W-B deposit has the peak value with increasing annealing temperature,which concerns with the phase type and number of crystallizable separation out
The variations of microhardness with the composition, heat treatment and structure have been studied by measuring microhardness and analyzing X-ray diffraction spectrum for electroless plating Fe-W-B crystallization and Fe-Mo-B amorphous alloys The results show that the microhardness of two alloy systems increases with increasing metalloid B contents, which is opposite to the electronic concentration The microhardness of Fe-W-B deposit has the peak value with increasing annealing temperature,which concerns with the phase type and number of crystallizable separation out
1997(1):52-55.
Abstract:
The effects of the rare earths in steels on the plasma nitriding, plasma sulphur-carbonitriding and gas carburising have been studied. An atomistic model based on electron affinities is proposed for the catalytic effect of the rare earths. It is pointed out that the rare earths accelerate the diffusion of carbon and nitrogen atoms, and the formation of nitride, carbide and carbonitride through direct and indirect actions. Therefore, the rare earths in steels have a significant catalytic effect during those treatments, and make the treated cases harder.
The effects of the rare earths in steels on the plasma nitriding, plasma sulphur-carbonitriding and gas carburising have been studied. An atomistic model based on electron affinities is proposed for the catalytic effect of the rare earths. It is pointed out that the rare earths accelerate the diffusion of carbon and nitrogen atoms, and the formation of nitride, carbide and carbonitride through direct and indirect actions. Therefore, the rare earths in steels have a significant catalytic effect during those treatments, and make the treated cases harder.
1997(1):56-61.
Abstract:
The conditions and methods for the determinating of trace oxygen and hydrogen in metal materials by the impulse-heating inert gas fusion method are presented. The methods of decreasing blank and the determinating of trace oxygen and hydrogen in Ti,Zr,Hf,Ta,Nb,W,Mo,Cu,Al etc. and their alloy have been particularly investigated.
The conditions and methods for the determinating of trace oxygen and hydrogen in metal materials by the impulse-heating inert gas fusion method are presented. The methods of decreasing blank and the determinating of trace oxygen and hydrogen in Ti,Zr,Hf,Ta,Nb,W,Mo,Cu,Al etc. and their alloy have been particularly investigated.
