- Issue 1,1997 Table of Contents
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Tang Huiping Northwest Institute for Nonferrous Metal Research , P O Box , Xi''''an Shaanxi , 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
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Thermal Plasticity of Titanium Alloys and Fabrication of Titanium Matrix Composites by Hydrogenation
Yang Ke Zhou Chaohui , Li Dongfa
1997(1):11-18.
Abstract:研究了氫對(duì)典型組織的鈦合金相變及高溫?zé)崴苄缘挠绊懀Y(jié)果表明：加氫可以顯著降低α單相及（α＋β）雙相組織鈦合金的α／β相轉(zhuǎn)變溫度，從而可明顯增加鈦合金在給定溫度下顯微組織中塑性β相的相對(duì)含量，有效提高鈦合金的高溫?zé)崴苄?。從而提出了通過(guò)對(duì)基體加氫來(lái)實(shí)現(xiàn)降低鈦基復(fù)合材料制備溫度的思路，并在實(shí)驗(yàn)上實(shí)現(xiàn)了在低于正常制備溫度５０℃下完成ＳｉＣ連續(xù)纖維增強(qiáng)Ｔｉ－１１００基和Ｔｉ－６Ａｌ－４Ｖ基復(fù)合材料的熱擴(kuò)散連
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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
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Tian Baohui , Wei Xuzhan , Wang Keguang , Li Huanxi Zhang Yonggang , Chen Changqi
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
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Ma Hongzheng , Huang Hanliang , Hu Yaojun
1997(1):27-30.
Abstract:根據(jù)工況的需求研究了魏氏組Ｔｉ－３１合金的低周疲勞性能。結(jié)果表明，在循環(huán)載荷下，Ｔｉ－３１合金表現(xiàn)出很好的循環(huán)穩(wěn)定性，但它是循環(huán)軟化材料。其裂紋萌生于α與β相界和α板條內(nèi)，裂紋擴(kuò)展區(qū)內(nèi)有大量二次裂紋生成。同時(shí)還回歸出Ｔｉ－３１合金的低周疲勞壽命公式，并指出其過(guò)渡壽命ＮＴ為５５６次。比較了具有相同顯微魏氏組織的Ｔｉ－３１合金與ＩＭＩ８２９鈦合金的低周疲勞性能，二者性能相當(dāng)。
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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
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1997(1):35-37.
Abstract:研究了以ＴｉＣ顆粒增強(qiáng)的鈦基復(fù)合材料的氧化特性。指出ＴｉＣ增強(qiáng)的鈦基復(fù)合材料在６５０℃以上高溫有著其它耐熱鈦合金不可比擬的高溫抗氧化性能；ＴｉＣ／Ｔｉ的反應(yīng)界面層有利于氧原子的擴(kuò)散，使復(fù)合材料在６５０℃以下的氧化初期氧化速度較快；但在６５０℃以下經(jīng)長(zhǎng)時(shí)間保溫，其氧化特性和其它耐熱鈦合金相似。
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Mao Zhonghan , Zu Guoxing , Bai Wenchao , Chen Jin , Liu Yiqiun
1997(1):38-40.
Abstract:研究了ＢＮｉ－２釬焊條真空吸鑄原理，并由試驗(yàn)得出：當(dāng)ＢＮｉ－２合金加熱到１５００℃，真空控制閥門(mén)開(kāi)口為φ６ｍｍ以上，真空度５０ｋＰａ，鑄型預(yù)熱溫度５００℃，并用φ內(nèi)２ｍｍ×５００ｍｍ石英管進(jìn)行真空吸鑄時(shí)，吸鑄高度可達(dá)到４０ｃｍ以上。
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Li Yimin , Qu Xuanhui , Huang Boyun , Qiu Guanghan
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
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1997(1):44-47.
Abstract:研究了一種磷酸鹽體系綠色稀土熒光粉，它們的化合式為（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的組分及磷硼化合物含量的變化對(duì)粉的發(fā)光亮度有明顯影響。對(duì)高溫固相反應(yīng)和還原條件的研究表明：在含碳?xì)夥障拢冢保保埃啊妫保玻埃啊孀茻沁m宜的。
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Wang Lingling , Zhang Bangwei , Ouyang Yifang , Yi Ge
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
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Xie Fei , Ma Baotian , He Jiawen
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.
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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.
