Volume 0,Issue 2,1995 Table of Contents
1995(2).
Abstract:
探讨了ＷＣ－Ｃｏ硬质合金饱和磁化强度的影响因素、磁化机制和比饱和磁化强度４πσ与抗弯强度σ（ＴＲＳ）的关系。结果表明，影响ＷＣ－Ｃｏ合金４πσ的主要因素是γ相含量和γ相成分，其次是γ相结构。其４πσ同合金标称钴含量或合金碳含量间均不存在单一性对应关系。γ相分布和热处理及添加稀土元素对合金４πσ的影响，实质上仍归结为上述基本因素的作用。ＷＣ－Ｃｏ合金的４πσ同抗弯强度间并不存在明确的对应关系，因而难以用饱和磁化强度（Ｍｓ或４πσ）取代σ（ＴＲＳ）的测定。
探讨了ＷＣ－Ｃｏ硬质合金饱和磁化强度的影响因素、磁化机制和比饱和磁化强度４πσ与抗弯强度σ（ＴＲＳ）的关系。结果表明，影响ＷＣ－Ｃｏ合金４πσ的主要因素是γ相含量和γ相成分，其次是γ相结构。其４πσ同合金标称钴含量或合金碳含量间均不存在单一性对应关系。γ相分布和热处理及添加稀土元素对合金４πσ的影响，实质上仍归结为上述基本因素的作用。ＷＣ－Ｃｏ合金的４πσ同抗弯强度间并不存在明确的对应关系，因而难以用饱和磁化强度（Ｍｓ或４πσ）取代σ（ＴＲＳ）的测定。
1995(2).
Abstract:
采用二次电子线扫描法研究了锆－４合金ＲＴ、４００℃和６００℃下疲劳断口分形特征，指出锆－４合金疲劳断口是一种与晶粒尺寸相当的材料组织层次上的分形结构；随着断口分形维数的增大，相应的疲劳寿命单调递增。认为相同循环塑性应变幅下，随着试验温度升高，疲劳过程中蠕变作用加强，断口表面蠕变空洞和二次裂纹数量明显增加，断口表面粗糙度增加是疲劳断口分形维数增大的原因。
采用二次电子线扫描法研究了锆－４合金ＲＴ、４００℃和６００℃下疲劳断口分形特征，指出锆－４合金疲劳断口是一种与晶粒尺寸相当的材料组织层次上的分形结构；随着断口分形维数的增大，相应的疲劳寿命单调递增。认为相同循环塑性应变幅下，随着试验温度升高，疲劳过程中蠕变作用加强，断口表面蠕变空洞和二次裂纹数量明显增加，断口表面粗糙度增加是疲劳断口分形维数增大的原因。
1995(2):1-7.
Abstract:
简要介绍了钛铝系金属间化合物的发展背景，着重阐述了目前α２－Ｔｉ３Ａｌ基、γ－ＴｉＡｌ基及δ－ＴｉＡｌ３基合金的发展状况、总结了近年来为了获得钛铝系金属间化合物的良好综合机械性能尤其是室温塑性，国内外研究者所采用的一系列方法。
简要介绍了钛铝系金属间化合物的发展背景，着重阐述了目前α２－Ｔｉ３Ａｌ基、γ－ＴｉＡｌ基及δ－ＴｉＡｌ３基合金的发展状况、总结了近年来为了获得钛铝系金属间化合物的良好综合机械性能尤其是室温塑性，国内外研究者所采用的一系列方法。
1995(2):8-17.
Abstract:
he developments, which include the ignition temperature, ignication time, dynamic of burring reaction, technology, principle of interaction of titanium with carbon and experimental method etc, are described. The development trend of Self-Propagating High- Temperature Synthesis of titanium carbide is pointed out
he developments, which include the ignition temperature, ignication time, dynamic of burring reaction, technology, principle of interaction of titanium with carbon and experimental method etc, are described. The development trend of Self-Propagating High- Temperature Synthesis of titanium carbide is pointed out
1995(2):18-21.
Abstract:
he process of nanometeral WC-Co powder.excellent performance and sintering behaviour of nanometral carbide are briefly presented.
he process of nanometeral WC-Co powder.excellent performance and sintering behaviour of nanometral carbide are briefly presented.
1995(2):27-33.
Abstract:
初步研究了拉应力和合金成分对Ｔｉ８１１合金棒材热盐应力腐蚀（ＨＳＳＣ）性能的影响。结果表明：Ａｌ含量小于８．０ｗｔ％时，Ａｌ、Ｍｏ、Ｖ含量的变化对合金ＨＳＳＣ性能无明显影响；Ａｌ含量大于８．０ｗｔ％，随Ａｌ含量升高，ＨＳＳＣ性能明显下降，而Ｍｏ、Ｖ含量可改善其性能；当拉应力由１４７ＭＰａ升高到１９６ＭＰａ，ＨＳＳＣ性能明显降低。在实验基础上，提出了ＨＳＳＣ断裂模型，盐蚀区有Ｃｌ－，Ｎａ＋等存在，产生微裂纹，裂纹沿原β晶界扩展，最终导致断裂。
初步研究了拉应力和合金成分对Ｔｉ８１１合金棒材热盐应力腐蚀（ＨＳＳＣ）性能的影响。结果表明：Ａｌ含量小于８．０ｗｔ％时，Ａｌ、Ｍｏ、Ｖ含量的变化对合金ＨＳＳＣ性能无明显影响；Ａｌ含量大于８．０ｗｔ％，随Ａｌ含量升高，ＨＳＳＣ性能明显下降，而Ｍｏ、Ｖ含量可改善其性能；当拉应力由１４７ＭＰａ升高到１９６ＭＰａ，ＨＳＳＣ性能明显降低。在实验基础上，提出了ＨＳＳＣ断裂模型，盐蚀区有Ｃｌ－，Ｎａ＋等存在，产生微裂纹，裂纹沿原β晶界扩展，最终导致断裂。
1995(2):40-44.
Abstract:
The corrosion resistances of 01420 Al-Li alloy under aged and pesk aged conditions have been studied systematically. The results show that the corrosion resistances of under aged alloy are better than those of peak aged alloy for intergranular corrosion, exfoliationcorrosion, salt spray corrosion and stress corrosion testing. The changes of corrosion resistance of alloy owe to the variations of quantity and distribution of S phase. The corrosion resistance of alloy will gradually lower with the increasment of S phase and its distribution in grain boundary.
The corrosion resistances of 01420 Al-Li alloy under aged and pesk aged conditions have been studied systematically. The results show that the corrosion resistances of under aged alloy are better than those of peak aged alloy for intergranular corrosion, exfoliationcorrosion, salt spray corrosion and stress corrosion testing. The changes of corrosion resistance of alloy owe to the variations of quantity and distribution of S phase. The corrosion resistance of alloy will gradually lower with the increasment of S phase and its distribution in grain boundary.
1995(2):45-49.
Abstract:
he effect of ball-milling on the properties of ultrafine ZrO2 (Y2O3) powders prepared by coprecipitation under different conditions is investigated. It is shown by the expertimental results that the agglomerate size of as-calcinated powders can be effectively decreased by ball-milling but the primary particle size is hardly affected. The surface area of seriously agglomerated powders can be markedly increased by ball-milling but that of softly agglomerated powders is not evidently increased. The crystal size of as-calcinated powders becomes much finer after ball-milling because transformation of the powder from tetragonal structure to monoclinic structure occurs during ball-milling. It is also shown that ball-milling can be used to improve the sinterability of seriously agglomerated powders.
he effect of ball-milling on the properties of ultrafine ZrO2 (Y2O3) powders prepared by coprecipitation under different conditions is investigated. It is shown by the expertimental results that the agglomerate size of as-calcinated powders can be effectively decreased by ball-milling but the primary particle size is hardly affected. The surface area of seriously agglomerated powders can be markedly increased by ball-milling but that of softly agglomerated powders is not evidently increased. The crystal size of as-calcinated powders becomes much finer after ball-milling because transformation of the powder from tetragonal structure to monoclinic structure occurs during ball-milling. It is also shown that ball-milling can be used to improve the sinterability of seriously agglomerated powders.
1995(2):50-54.
Abstract:
he consumption of lithium and variation of hydrogen contents in the process of melting and casting Al-2. 8% Li alloys tube have been studied. Experimental and calculation results indicate that reasonable option for melting and casting process can decrease the consumption of isotope lithium-6 below 2%. The increase of hydrogen contents in Al-Li alloys is mainly caused by absorption of moisture.
he consumption of lithium and variation of hydrogen contents in the process of melting and casting Al-2. 8% Li alloys tube have been studied. Experimental and calculation results indicate that reasonable option for melting and casting process can decrease the consumption of isotope lithium-6 below 2%. The increase of hydrogen contents in Al-Li alloys is mainly caused by absorption of moisture.
1995(2):55-59.
Abstract:
he explosive clad of Ta-10W liner tube and CrNiMo steel tubular sections has been studied. The interfaces of explosive clad have been examinated also. The relationship between explosive charg and deformation of tabular section is discussed. The effect of explosive clad on mechanical properties of tabular sections is analysed. The optimun process parameters of explosive clad are determined. The results show that the corrected optimum process parameters of explosive clad for plate can be used for explosive clad of inner liner tube. The thickness of explosive charge for explosive clad of tube with circular cross-section is about 60% of that for explosive clad of plate under the same conditions. Ta-10W liner tube of 0.4mm wall can be claded with inner wall of CrNiMo tube under the condition of explosive charge mass ratio R of 0.8. The interfaces of explosive clad are wavelike.
he explosive clad of Ta-10W liner tube and CrNiMo steel tubular sections has been studied. The interfaces of explosive clad have been examinated also. The relationship between explosive charg and deformation of tabular section is discussed. The effect of explosive clad on mechanical properties of tabular sections is analysed. The optimun process parameters of explosive clad are determined. The results show that the corrected optimum process parameters of explosive clad for plate can be used for explosive clad of inner liner tube. The thickness of explosive charge for explosive clad of tube with circular cross-section is about 60% of that for explosive clad of plate under the same conditions. Ta-10W liner tube of 0.4mm wall can be claded with inner wall of CrNiMo tube under the condition of explosive charge mass ratio R of 0.8. The interfaces of explosive clad are wavelike.
1995(2):60-65.
Abstract:
he principle and optional conditions of inert gas fusion (impulse heating) method for determination of hydrogen with Sn-flux are described. The results show that the method for determinating hydrogen in Ti. Zr. Hf. Ta. Nb and their alloys is accurate. The POwer for analysing are 2500W for Ti. Zr and Hf and 2700-2800W for Ta and Nb. The heating-times are 30s for Ti. Zr and Hf and 40s for Ta and Nb, respectively.
he principle and optional conditions of inert gas fusion (impulse heating) method for determination of hydrogen with Sn-flux are described. The results show that the method for determinating hydrogen in Ti. Zr. Hf. Ta. Nb and their alloys is accurate. The POwer for analysing are 2500W for Ti. Zr and Hf and 2700-2800W for Ta and Nb. The heating-times are 30s for Ti. Zr and Hf and 40s for Ta and Nb, respectively.
1995(2):66-70.
Abstract:
he tests of single-direction tension and expanding with hydrostatic pressure (double-direction tension) have been carried out for 9 kinds of plate. The relationships ofperformance indexes for single-direction and double-direction tension are studied,respectively. A series of significant results are obtained.
he tests of single-direction tension and expanding with hydrostatic pressure (double-direction tension) have been carried out for 9 kinds of plate. The relationships ofperformance indexes for single-direction and double-direction tension are studied,respectively. A series of significant results are obtained.
1995(2):71-75.
Abstract:
new method of measuring the mean length of fibers in composites using SEM is presented in this paper. The fibers in preforms of Short Fiber Reinforced Metal-Matrirx-Composties(SFR MMCs) have been measured. The results show that the length of fibers is a Gauss distribution.
new method of measuring the mean length of fibers in composites using SEM is presented in this paper. The fibers in preforms of Short Fiber Reinforced Metal-Matrirx-Composties(SFR MMCs) have been measured. The results show that the length of fibers is a Gauss distribution.
1995(2):76-80.
Abstract:
his paper introduces the automatic controll principle and structure of hardware and software for the titanium and titanium alloys dispense system controlled by the computer
his paper introduces the automatic controll principle and structure of hardware and software for the titanium and titanium alloys dispense system controlled by the computer
