Volume 0,Issue 2,1996 Table of Contents
1996(2).
Abstract:
采用磁悬浮区域熔炼的方法制取Ｔｉ－４８ａｔ％Ａｌ合金的ＰＳＴ晶体。并对其显微组织进行了金相及ＴＥＭ的观察与分析。结果表明，ＰＳＴ晶体的生长取决于生长速率。当生长速率小于５ｍｍ／ｈ时可获得ＰＳＴ晶体，而当生长速率增至１００ｍｍ／ｈ时，得到柱状晶晶体。ＴＥＭ观察的结果表明，在ＰＳＴ晶体的片层组织中存在三种类型的ＴｉＡｌ／ＴｉＡｌ有序畴界，即真孪晶型，伪孪晶型，１２０°旋转孪晶型界面。
采用磁悬浮区域熔炼的方法制取Ｔｉ－４８ａｔ％Ａｌ合金的ＰＳＴ晶体。并对其显微组织进行了金相及ＴＥＭ的观察与分析。结果表明，ＰＳＴ晶体的生长取决于生长速率。当生长速率小于５ｍｍ／ｈ时可获得ＰＳＴ晶体，而当生长速率增至１００ｍｍ／ｈ时，得到柱状晶晶体。ＴＥＭ观察的结果表明，在ＰＳＴ晶体的片层组织中存在三种类型的ＴｉＡｌ／ＴｉＡｌ有序畴界，即真孪晶型，伪孪晶型，１２０°旋转孪晶型界面。
1996(2).
Abstract:
研究了１３种不同加工热处理制度的Ｚｒ－１Ｎｂ合金在堆外高压釜内３６０℃、１９ＭＰａ水中的吸氢性能，对其影响因素和吸氢机理进行了分析，并讨论了吸氢动力学，建立了吸氢动力学方程，计算了吸氢动力学参数。
研究了１３种不同加工热处理制度的Ｚｒ－１Ｎｂ合金在堆外高压釜内３６０℃、１９ＭＰａ水中的吸氢性能，对其影响因素和吸氢机理进行了分析，并讨论了吸氢动力学，建立了吸氢动力学方程，计算了吸氢动力学参数。
1996(2).
Abstract:
The Research status of the effect of alloying elements on microstructure and mechanical properties of Mg-Li base alloys, the existing problemes and the ways to solve them, and developing tendency are outlined.
The Research status of the effect of alloying elements on microstructure and mechanical properties of Mg-Li base alloys, the existing problemes and the ways to solve them, and developing tendency are outlined.
1996(2):6-9.
Abstract:
采用Ｘ射线衍射及ＴＥＭ技术研究了Ｔｉ４４Ｎｉ４７Ｎｂ９形状记忆合金的相组成及热诱发马氏体相变。结果表明：该合金室温下由ＴｉＮＩ基体相和β－Ｎｂ相组成；当试样温度降低到Ｍｓ点以下时，具有Ｂ１９＇单斜结构的热诱发马氏体呈群团状区域式生长，形成由２－３个取向的孪晶微区组成的群团状马氏体；马氏体的亚结构主要为（１１１）ＭⅠ型孪晶，同时还有（００１）Ｍ孪晶和反相畴界。
采用Ｘ射线衍射及ＴＥＭ技术研究了Ｔｉ４４Ｎｉ４７Ｎｂ９形状记忆合金的相组成及热诱发马氏体相变。结果表明：该合金室温下由ＴｉＮＩ基体相和β－Ｎｂ相组成；当试样温度降低到Ｍｓ点以下时，具有Ｂ１９＇单斜结构的热诱发马氏体呈群团状区域式生长，形成由２－３个取向的孪晶微区组成的群团状马氏体；马氏体的亚结构主要为（１１１）ＭⅠ型孪晶，同时还有（００１）Ｍ孪晶和反相畴界。
1996(2):10-16.
Abstract:
Two issues in coprecipitation route to synthesize Bi-Pb-Sr-Ca-Cu-O Superconductor precursor powder,coprecipitation mode and coprecipitation medium, which are a first priority, are analysized based on thermodynamicprinciples. Experimental demonstration is also carried out. The results show that the opposite-sequence-titration mode,low surface-tension and viscosity medium help to maintain excellent compositional homogeneity and stoichiometry incoprecipitation product.
Two issues in coprecipitation route to synthesize Bi-Pb-Sr-Ca-Cu-O Superconductor precursor powder,coprecipitation mode and coprecipitation medium, which are a first priority, are analysized based on thermodynamicprinciples. Experimental demonstration is also carried out. The results show that the opposite-sequence-titration mode,low surface-tension and viscosity medium help to maintain excellent compositional homogeneity and stoichiometry incoprecipitation product.
1996(2):17-20.
Abstract:
漫渗燃烧合成可分为两个主要过程，即漫渗和燃烧合成。影响漫渗的主要因素是Ａｌ对Ｔｉ的润湿性，它主要与温度有关。提高温度有利于漫渗。燃烧合成主要存在两次反应，其中生成ＴｉＡｌ３的反应瞬间即可完成，是一剧烈的化学过程，属于非扩散控制；由ＴｉＡｌ３转变成ＴｉＡｌ的过程相应要慢得多，是一个扩散控制。整个反应受二次反应控制，即受扩散控制。
漫渗燃烧合成可分为两个主要过程，即漫渗和燃烧合成。影响漫渗的主要因素是Ａｌ对Ｔｉ的润湿性，它主要与温度有关。提高温度有利于漫渗。燃烧合成主要存在两次反应，其中生成ＴｉＡｌ３的反应瞬间即可完成，是一剧烈的化学过程，属于非扩散控制；由ＴｉＡｌ３转变成ＴｉＡｌ的过程相应要慢得多，是一个扩散控制。整个反应受二次反应控制，即受扩散控制。
1996(2):26-29.
Abstract:
The properties of Environmental Suitable Material St3N4 are briefly discussed in view of the selection of raw materiaLcomposition design, sintering and fatigue life. The results show that Si3N4 material has imPOrtant effect as a new type of toolmaterial in metal machining. Si3N4 is environmental suitable material with high strength and long serviCe life also, so it has thebroad Prospects of application.
The properties of Environmental Suitable Material St3N4 are briefly discussed in view of the selection of raw materiaLcomposition design, sintering and fatigue life. The results show that Si3N4 material has imPOrtant effect as a new type of toolmaterial in metal machining. Si3N4 is environmental suitable material with high strength and long serviCe life also, so it has thebroad Prospects of application.
1996(2):30-32.
Abstract:
The fracture toughnesses of nanometer she Zro2 Particles toughening MoSi2 mains compositesmade by hot-pressing have been calculated by the various equations, and the effects of indentatinn loads onK1c values of the composites have been also investigated. It is demonstrated that the K1c values of test material do not abide by the median crack system equation and abide by palmquist crack system equeations. Theindependent fracture toughness from indentation load at room temperature has been observed in this material.
The fracture toughnesses of nanometer she Zro2 Particles toughening MoSi2 mains compositesmade by hot-pressing have been calculated by the various equations, and the effects of indentatinn loads onK1c values of the composites have been also investigated. It is demonstrated that the K1c values of test material do not abide by the median crack system equation and abide by palmquist crack system equeations. Theindependent fracture toughness from indentation load at room temperature has been observed in this material.
1996(2):37-40.
Abstract:
The undercooling degree above 0.3TI can be steady obtained by the technique of auto-seperating denucleation ofmolten glass for the (Ni0.53 Fe0.33 Co0.14)73B17Si8 Nb2 alloy. The roie of electromagnetic field has been investigated in t hesolidfotion of undercooled melt. The observations and analysis show that electromagnetic field has little effect on theundercooling, but has obvious effect on the nucleation and growth of crystal. The laws of nucleation and crystal groWth in theelectromagnetic field are different from these in solidification. It is believed that electromagnetic field can further increasethermodynamic undercooling degree
The undercooling degree above 0.3TI can be steady obtained by the technique of auto-seperating denucleation ofmolten glass for the (Ni0.53 Fe0.33 Co0.14)73B17Si8 Nb2 alloy. The roie of electromagnetic field has been investigated in t hesolidfotion of undercooled melt. The observations and analysis show that electromagnetic field has little effect on theundercooling, but has obvious effect on the nucleation and growth of crystal. The laws of nucleation and crystal groWth in theelectromagnetic field are different from these in solidification. It is believed that electromagnetic field can further increasethermodynamic undercooling degree
1996(2):41-45.
Abstract:
The regenerated hard metal made from W-Co composite recycled by Co-precipitation has the advantages of fine WC grain sire, high coercive force and high hardness. However, more WC grain defects, higher WC grain contiguity Cwc-we and discontinuously grown WC grains can reduce its strength and toughness.The more exactly controling carbon content of regenerated hard metal than that of normal WC-Co alloy isnecessary to make two-phase WC+y alloy with W-Co composite recycled by Co-precipitation.
The regenerated hard metal made from W-Co composite recycled by Co-precipitation has the advantages of fine WC grain sire, high coercive force and high hardness. However, more WC grain defects, higher WC grain contiguity Cwc-we and discontinuously grown WC grains can reduce its strength and toughness.The more exactly controling carbon content of regenerated hard metal than that of normal WC-Co alloy isnecessary to make two-phase WC+y alloy with W-Co composite recycled by Co-precipitation.
1996(2):46-50.
Abstract:
Various impact toughnesses of TA5 titanium alloy plate at ambient temperature, their relationships each other and the effects of rolling process factors on the relationships are studied. The results show that aKV and aK (transverse) have agood linear relations with aK and aK(vertical) under certain conditions, respectively. AK||l has more sellsitivity to notch. Thelower rolling temperature and the more deformation. the more obivious the texture and the lower the ratioes of aKll / aK andaKV / aKU. The values of aK and aKV / aKU can be improved by means of arranging rolling process suitably.
Various impact toughnesses of TA5 titanium alloy plate at ambient temperature, their relationships each other and the effects of rolling process factors on the relationships are studied. The results show that aKV and aK (transverse) have agood linear relations with aK and aK(vertical) under certain conditions, respectively. AK||l has more sellsitivity to notch. Thelower rolling temperature and the more deformation. the more obivious the texture and the lower the ratioes of aKll / aK andaKV / aKU. The values of aK and aKV / aKU can be improved by means of arranging rolling process suitably.
