- Issue 3,1994 Table of Contents
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Meng Liang , Huan Hong , Li Zuochen
1994(3).
Abstract:用自制的液體自動(dòng)循環(huán)裝置，在室溫下對(duì)Ｔｉ－７５合金進(jìn)行了腐蝕疲勞性能的試驗(yàn)研究。結(jié)果表明，Ｔｉ－７５合金在大氣、３．５Ｗｔ％ＮａＣｌ溶液條件下，在１×１０７周次下的疲勞極限為３９２ＭＰａ和４３１ＭＰａ。并在大氣，３．５ｗｔ％ＮａＣｌ條件下，對(duì)Ｔｉ－７５和ＴＡ５的抗腐蝕疲勞性能進(jìn)行對(duì)比研究，發(fā)現(xiàn)Ｔｉ－７５比ＴＡＳ分別提高了２９％和２６％。提高原因與合金顯微組織等密切相關(guān)。
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Yang Guanjun , Xie Liying , Hu Wenying , Deng Ju
1994(3).
Abstract:采用Ｘ射線衍射術(shù)和ＯＤＦ研究了再結(jié)晶退火對(duì)Ｎｉ４７Ｔｉ４４Ｎｂ９合金冷軋板相組成和織構(gòu)的影響。結(jié)果表明，冷軋板材的相組成為Ｂ２＋β－Ｎｂ＋Ｂ１９＇；織構(gòu)類型為面織構(gòu)｛００１｝ｐ＋｛１１０｝ｐ再結(jié)晶退火期間，馬氏體相Ｂ１９＇逆轉(zhuǎn)變?yōu)槟赶啵拢?，合金的相組成為：Ｂ２十β－Ｎｂ，而再結(jié)晶織構(gòu)為：｛００１｝＜１１０＞ｐ。
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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.
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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.
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1994(3):17-22.
Abstract:利用ＳＥＭ，ＴＥＭ技術(shù)對(duì)Ａｌ_２Ｏ_３ｐ，ＳｉＣ_ｐ增強(qiáng)純鋁基復(fù)合材料進(jìn)行了組織觀察和分析，認(rèn)為陶瓷顆粒的加入使材料的σ_ｂ，σ_（０．２）提高了，但延伸率有所下降；指出顆粒強(qiáng)化的位錯(cuò)機(jī)制不能用單一的Ｏｒｏｗａｎ機(jī)制來(lái)解釋，還應(yīng)考慮位錯(cuò)胞狀亞結(jié)構(gòu)的影響，并認(rèn)為強(qiáng)度σ_ｃ＝ｆ（ｍ，Ｐ，ｄｐ，Ｖｐ，Φ，，Ｉ）經(jīng)擬合得出本研究條件下的
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1994(3):23-26.
Abstract:用三點(diǎn)彎曲法研究了金屬間化合物γ－ＴｉＡｌ和用塑性Ｔｉ纖維韌化的Ｔｉ／ＴｉＡｌ復(fù)合材料的彎曲性能；利用Ｘ射線衍射儀，光學(xué)顯微鏡、掃描電鏡研究了它們的相組成，并分析了Ｔｉ／ＴｉＡｌ復(fù)合材料彎曲性能和界面相之間的關(guān)系。結(jié)果表明：Ｔｉ／ＴｉＡｌ復(fù)合材料的彎曲強(qiáng)度提高了２２．５％，撓度提高不明顯，有明顯韌化的效果。復(fù)合材料中Ｔｉ３Ａｌ、Ｔｉ２Ａｌ等金屬間化合物相析出，是它塑性沒(méi)有明顯優(yōu)化的原因。
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Gao Jiqiang , Wang Yonglan , Yang Jianfeng , Jin Zhihao
1994(3):33-39.
Abstract:測(cè)定了鋯－２．５Ｗｔ％鈮合金在冷變形量為２０％，５０％及４００℃退火后的板織構(gòu)，計(jì)算了織構(gòu)系數(shù)，討論了織構(gòu)形成、發(fā)展與工藝的關(guān)系。結(jié)果表明，冷加工變形量越大，織構(gòu)越強(qiáng)烈；冷加工變形織構(gòu)在４００℃／２４ｈ退火后不僅不會(huì)消失，反而會(huì)得到加強(qiáng)，這是由于擇優(yōu)取向的亞晶在退火回復(fù)過(guò)程中變得更加完整的原因。
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Liu Ning , Hu Zhenhua , Cuo Kun
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.
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Tan Ping , Tang Huiping , Li Zengfeng
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.
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Wang Yongkang , Cheng Xiangyu , Wang Weiming , Gu Xiaohong , Li Bingsheng
1994(3):55-58.
Abstract:運(yùn)用ＰＶＤ工藝在Ｍ２高速鋼表面沉積了（ＴｉＡｌ）Ｎ涂層，用ＳＥＭ、ＴＥＭ和ＸＲＤ方法對(duì)涂層顯微組織和結(jié)構(gòu)進(jìn)行了分析研究，并對(duì)涂層的性能進(jìn)行測(cè)試。結(jié)果表明，涂層的顯微硬度和耐磨性隨涂鍍時(shí)基體溫度上升而提高，在ＴＳ＝４８０℃時(shí)涂鍍效果較佳；也隨涂鍍時(shí)的氮流量有關(guān)系，當(dāng)Ｎｆ＝１２ｍｌ．ｍｉｎ－１時(shí)，Ｈｖ可達(dá)２４００。
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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.
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(Northwest Institute for Nonferrous Metal Research , Baoji )Chen Zhongdan
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.
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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.
