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Abstract:When W and Re composited nozzle operates at high temperature, the reactive diffusion between W and Re takes place with the result that a transition layer comprising different phases appears. According to experimental results, the curves of the concentration distribution of reactive diffusion have been obtained, the components of the phases have been determined, their microstructures have been observed, and the influence of the transition layer upon operation performances has been discussed.

Abstract:Hydrogen storage properties of TiFe_xCr_yMn_z alloy activated and absorbed under 1.5 MPa hydrogen pressure have been studied,and the heason which improved the activation properties by adding Cr and Mn has been discussed.

Abstract:Diffraction geometry of Seemann-Bohlin focusing Guinier film camera and the general principle of determing film stress and lattice constant simutaneously by this camera are described. Its design chart is also given. Taking Nb3Ge superconducting film sample for example, the paper has illustrated the determination procedure in details.

Abstract:The surface modification technologies of materials by high energy beams and their applications to the Ti alloys are reviewed in the present paper. The methods of the surface modification include laser phase transition hardening under solid state, laser surface melting-solidifying treatment, laser surface alloying, ion implantation, ion beam mixing and ion assisted physical vapor deposition. The surface hardness, wear resistent and corrosion resistant properties can be increased by mentioned above techologies.

Abstract:純?nèi)狽dFeB磁體的顯微組織主要由Nd_2Fe_(14)B硬磁ψ相,富硼Nd_(1+ε)Fe_4B_4η相,富Nd相及少量雜相組成。其中占磁體體積百分比85%～90%的ψ相是非內(nèi)稟磁特性的主要貢獻者;占磁體體積5%的η相對iHc無益,但少許η相仍有利于ψ相形成,富Nd相對ψ相具包裹作用,有助于提高矯頑力;雜相使反磁化疇易于形成,應(yīng)盡量少。同時,討論了各顯微組織的形成及作用機理。

Abstract:The formation conditions morphology and machanical properties of the CuCo_2Be alloy of widmanstatten structure were studied in this paper. The results show that the widrmanstatten structure in the form of needle CoBe phase in CuCO_2Be alloy under a given condition and has a strict orientation with the matrix. The widmanstatten structure, the needle CoBe phase in CuCo_2Be alloy would be spheroidized and coarsenned, annealing for long time at high temperature after resulting in the change of mechanical properties.

Abstract:研究了新中強耐蝕鈦合金Ti-3AR(Ti-Al-Mo-Ni)在室溫,60C,沸騰條件下的20%—50%HNO_3、1.5%—30%H_2SO_4、1.5%—15%HCl中的耐蝕性,并從電化學角度對其耐蝕機理進行了分析。結(jié)論認為:Ti-3AR具有與Ti-12相當?shù)牧己媚臀g性能,這是由于新添加的合金元素Mo,Ni能程度不同地提高鈦在H_2SO_4,HCl等介質(zhì)中的腐蝕電位,并通過促進陽極鈍化改善鈦的腐蝕性能。

Abstract:對Ti_3Al基合金Ti_3Al-26M,Ti_3Al-11.5M和Ti_3Al-22M(wt%)(M=Nb,Mo,V)的熱處理與顯微組織和顯微組織與蠕變性能之間的關(guān)系進行了探討。結(jié)果表明:同一合金在不同熱處理條件下的顯微組織具有不同的特征和尺寸,而在同一熱處理條件下的3種合金顯微組織特征相同,只是晶粒的尺寸不同。高溫蠕變性能測定表明,Ti_3Al-26M合金的蠕變性能優(yōu)于Ti_3Al-11.5M和Ti_3Al-22M合金。Ti_3Al-26M合金經(jīng)β固溶處理的魏氏組織的蠕變性能最好,經(jīng)α_2+β固溶+時

Abstract:研究了鈀中含有0.62wt%—6.96wt%釔的5種成分PdY合金箔的制備工藝、加工性能及氕滲透性,并就釕的加入對PdY合金性能的影響進行了探索。測定了兩種合金系箔材的X線衍射譜。結(jié)果表明,隨著Y含量的增加,PdY合金的硬度、強度及塑性值均提高,氕的滲透率也明顯增加。釕加入合金后,進一步使PdY合金的力學和加工性能得到提高。

Abstract:研究了用快速冷凝(RS)旋轉(zhuǎn)電極工藝制取的Ti_3Al基合金粉末的物理性能、化學性能、顯微結(jié)構(gòu)以及熱處理對顯微結(jié)構(gòu)、顯微硬度的影響。結(jié)果表明,用該方法制備的合金粉末,化學成分穩(wěn)定,工藝性能良好,細顆粒粉末由單相β固溶體組成,但隨著熱處理溫度的變化,粉末的顯微結(jié)構(gòu)和顯微硬度發(fā)生相應(yīng)的變化。

Abstract:The physical, mechanical, corrosion properties and microstructures have been studied for the three kinds of 2024 aluminium alloys containing mixed trace earth elements of 0.005,0.016,0.053 wt% respectively. It has been shown that the starting point of metling temperature range was obviously elevated, tensile-compression fatigue lifes were increased and the stress corrosion resistance has been slightly improvement.

Abstract:對不同狀態(tài)的鋯-4合金管材進行了高溫蒸汽腐蝕研究。經(jīng)400℃預膜和未預膜的樣品在460℃/10.3 MPa的蒸汽中進行腐蝕試驗,結(jié)果表明:未預膜的樣品迅速腐蝕,而預膜處理延緩了癤狀腐蝕的產(chǎn)生;不同加工工藝的樣品的腐蝕結(jié)果截然不同。擠壓前進行β淬火使Zr-4合金的抗癤狀腐蝕性能得到改善,應(yīng)變時效處理后的Zr-4合金管材具有良好的抗癤狀腐蝕性能。癤狀腐蝕的敏感性與合金的組織狀態(tài)密切相關(guān),取決于合金中的第二相粒子的數(shù)密度、平均粒子大小和基體中溶質(zhì)元素的含量。

Abstract:Ion-implantation has been carried out for the metal Be in different doses,and the surface microhardness has been measured after the ion implantation.The hardness of the surface layers ion-implanted has been calculated by the Jonsson hardness model from the measured hardness and analysed as a function of implanted doses for the harden mechanism of implantation.The results showed that the hardness of Be increased by a factor of 9 after ion-implantation.

Abstract:Determination of trace aluminium has been investigated in this paper.First,the Zr,Ti,Fe and Hf were and separated from aluminium in a sulfuric acid medium.Then,the complex of aluminium-N-bonzoyl-N-phenylhydroxylamine was extracted in the resultant aqueous phase by benzene at pH 8.5,and aluminium was extracted in the resulting organic phase by dilute hydrochloric acid.Lastly,aluminium content was determined by the chromazurol S photometric method in the pHrange of 5.5 to 6.the method can be used for the determination of traee aluminium in the range of 0.0025%to 0.035% in Zirconium and zirconium alloys with satisfactory results.