- Issue 2,1996 Table of Contents
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Lin Jinnguo , Zhou Yajian , Zhang Yonggang , and Chen Changqi
1996(2).
Abstract:采用磁懸浮區(qū)域熔煉的方法制?。裕椋矗福幔簦ィ粒旌辖鸬模校樱跃w。并對(duì)其顯微組織進(jìn)行了金相及ＴＥＭ的觀察與分析。結(jié)果表明，ＰＳＴ晶體的生長取決于生長速率。當(dāng)生長速率小于５ｍｍ／ｈ時(shí)可獲得ＰＳＴ晶體，而當(dāng)生長速率增至１００ｍｍ／ｈ時(shí)，得到柱狀晶晶體。ＴＥＭ觀察的結(jié)果表明，在ＰＳＴ晶體的片層組織中存在三種類型的ＴｉＡｌ／ＴｉＡｌ有序疇界，即真孿晶型，偽孿晶型，１２０°旋轉(zhuǎn)孿晶型界面。
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Xue Xiangyi , Liu Jianzhang , Song Qizhong , Li Peizhi
1996(2).
Abstract:研究了１３種不同加工熱處理制度的Ｚｒ－１Ｎｂ合金在堆外高壓釜內(nèi)３６０℃、１９ＭＰａ水中的吸氫性能，對(duì)其影響因素和吸氫機(jī)理進(jìn)行了分析，并討論了吸氫動(dòng)力學(xué)，建立了吸氫動(dòng)力學(xué)方程，計(jì)算了吸氫動(dòng)力學(xué)參數(shù)。
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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.
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1996(2):6-9.
Abstract:采用Ｘ射線衍射及ＴＥＭ技術(shù)研究了Ｔｉ４４Ｎｉ４７Ｎｂ９形狀記憶合金的相組成及熱誘發(fā)馬氏體相變。結(jié)果表明：該合金室溫下由ＴｉＮＩ基體相和β－Ｎｂ相組成；當(dāng)試樣溫度降低到Ｍｓ點(diǎn)以下時(shí)，具有Ｂ１９＇單斜結(jié)構(gòu)的熱誘發(fā)馬氏體呈群團(tuán)狀區(qū)域式生長，形成由２－３個(gè)取向的孿晶微區(qū)組成的群團(tuán)狀馬氏體；馬氏體的亞結(jié)構(gòu)主要為（１１１）ＭⅠ型孿晶，同時(shí)還有（００１）Ｍ孿晶和反相疇界。
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Mao Chuanbin , Du Zehua , and Zhou Lian
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.
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1996(2):17-20.
Abstract:漫滲燃燒合成可分為兩個(gè)主要過程，即漫滲和燃燒合成。影響漫滲的主要因素是Ａｌ對(duì)Ｔｉ的潤濕性，它主要與溫度有關(guān)。提高溫度有利于漫滲。燃燒合成主要存在兩次反應(yīng)，其中生成ＴｉＡｌ３的反應(yīng)瞬間即可完成，是一劇烈的化學(xué)過程，屬于非擴(kuò)散控制；由ＴｉＡｌ３轉(zhuǎn)變成ＴｉＡｌ的過程相應(yīng)要慢得多，是一個(gè)擴(kuò)散控制。整個(gè)反應(yīng)受二次反應(yīng)控制，即受擴(kuò)散控制。
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Wang Hongjie , Wang Yonglan , Jin Zhihao , Zhou Huijiu
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.
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Ma Qin , Yang Yanqin , and Kang Mokuang
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.
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Zhou Genshu , Yang Gencang , Zhou Yaohe
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
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Liu Shourong , Yao Wenjun , Yang Huiqin , Zhang Junmin , Wang Baorong
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.
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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.
