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Abstract:The preparations of reference materials (RM) used for chemical analysis of Ti and its alloys have been reported, including the preparation processes of RM, the homogeneity tests and the certification of compositions. The process and guality norms of the RM are in accord with the:Technical Norm of Primary Reference Materical.

Abstract:The Ti-54wt% Ni shape memory alloy has been invest igated with a HVEM. It was found that the intense diffuse scattered streaks appeared in SADPs of B2-phase. In situ observation during heating showed that the streaks were related to the instability of the crystal lattice of B2-phase. SADPS taken form an area during tilting a specimen show that the diffuse scattered streaks are formed from the rel walls intersecting fundamental reciprocal points. SADPs of B2- Phase with the zone axises [012], [023], [011], [(?)33], [(?)33], [(?)11] and [(?)35] were taken. These SADPs show that the diffuse scattered streaks in SADPs usually lie in three different directions, intersect each other and form a network. Each streak consists of several sections. These sections lie in a line only in the [111] SADP. The sections are parallel each other, but do not lie in a line in other SADPs. Diffuse scattered streaks do not intersect the super-structure diffraction spots and centre spot, but the fundamental diffraction spots and can intersect each other at the positions without the diffraction spot. It can be assumed that the diffuse scattered streaks are formed by the rel walls lying on the {112}~* planes, intersecting at the fundamental points of the reciprocal lattice, and with certain dimensions. The rel walls can be used to explain the geometric characteristics of the diffuse scattered streaks and the change of angles between streaks in different SADPs. Finally, the formation and distribution of the rel walls as well as the length of diffuse scattered streaks in SADPs have also been discussed according to the diffuse scattering of electron by the transverse acoustic phonon waves with the wave vector lying on {112}~* planes in the lattice of B2-phase.

Abstract:研究了時(shí)效析出相對(duì)8090鋁鋰合金回復(fù)與再結(jié)晶的影響。透射電鏡觀察表明320℃/8 h時(shí)效的試樣在350℃溫軋后形成的是有殘余位錯(cuò)存在的位錯(cuò)胞結(jié)構(gòu),而450℃/8 h時(shí)效的試樣中對(duì)應(yīng)的組織是邊界整齊的亞晶結(jié)構(gòu)。經(jīng)500℃/15 min保溫,前者是帶有混亂晶內(nèi)位錯(cuò)的亞晶組織,后者是無混亂晶內(nèi)位錯(cuò),且具有可動(dòng)性晶界的亞晶組織。晶界角度測試結(jié)果表明,保溫后亞晶的平均晶界角度隨析出相間距而增大。研究表明,析出相通過對(duì)位錯(cuò)的釘扎而影響回復(fù)過程,最終影響再結(jié)晶核心的形成。

Abstract:We review some theories of the interface formation and reactions and the residual thermal stress at the interface between ceramics and metals, and also introduce the brazing methods, brazing fillers and the evaluation methods for the properties of the ceramic-ceramic and ceramic-metal joints.

Abstract:The developing processes of microstructure of NdDyFeB green compacts in the different heating stages have been analysed in a thermodynamic principle, and some kinetic phenomena such as particle rearrangement, solution-precipitation, formation of solid skeleton and ploygonization have also been researched. It is shown that the density of magnets varies with the change of microsturcture, leading to the change of magnetic properties. The presence of Nd-rich liquid phase, the elmination of gas absorbed film on the surface of grains of different sizes are helpful for densification of magnets. The grain coarsing, polygnonization of grain shape and pore migration are keys to obtain the final densification.

Abstract:The interfacial characteristics of Ti/TiAl, Nb/TiAl and NbTi/TiAl composites were studied by using the simulated specimens. The results showed that the interfacial reaction layer of the explosion specimen was thicker than that of the HIP's specimen, and there are obvious differences in the interfacial characteristics for these three HIP's specimens under the same condition. The HIP's Ti/TiAl and NbTi/TiAl specimens had thicker interfacial reaction layers and higher interfacial bonding strength than the HIP's specimen.

Abstract:對(duì)MTG區(qū)熔生長法,慢冷法,粉末熔融生長法這3種方法制備的熔融織構(gòu)YBCO塊樣品進(jìn)行了交流磁化率和磁阻的測量。根據(jù)實(shí)驗(yàn)結(jié)果計(jì)算了樣品的釘扎勢,并且發(fā)現(xiàn)3種方法制備的樣品在150 mT外磁場下均顯示出基本消除弱連接的特性;粉末融熔生長法所制樣品中有較純凈123相和較好織構(gòu),質(zhì)量最好。

Abstract:研究了Ti-Co(Ni)-Al系合金的低溫高速超塑性行為,表明該合金系在很寬的應(yīng)變速率范圍內(nèi)((?)=10~(-1)～10~(-3)S~(-1))和較低的變形溫度下(700—750℃)具有良好的超塑性。Ti-Co-Al合金最高延伸率大于2000%,m值為0.58—0.70。認(rèn)為超細(xì)的α晶粒和均勻彌散的第二相粒子Ti_2Co(Ti_2Ni)等是有利于合金超塑性變形的顯微組織因素。用TEM和SEM對(duì)超塑拉伸過程中合金顯微組織的變化進(jìn)行了觀察,發(fā)現(xiàn)晶界滑動(dòng)和晶粒轉(zhuǎn)動(dòng)是Ti-Co(Ni)-Al系合金超塑變形的主導(dǎo)

Abstract:研究了羥基磷灰石(HA)和中性玻璃(G)的混合涂料在TC4多孔鈦基體上的界面復(fù)合強(qiáng)度。探討了中性玻璃含量、基體表面狀態(tài)以及燒結(jié)工藝對(duì)這種涂層復(fù)合種植體的復(fù)合強(qiáng)度的影響。指出:復(fù)合的實(shí)質(zhì)是中性玻璃與基體的潤濕結(jié)合,最合適的玻璃含量為50 wt%,提高復(fù)合強(qiáng)度的關(guān)鍵,在于基體表面的TiN蒸鍍處理,當(dāng)TiN厚度為2～3 μm時(shí),復(fù)合強(qiáng)度可達(dá)7.2 MPa。最佳燒結(jié)工藝為:900～950℃/30 min。

Abstract:The effects of impurities(such as Fe, Ni, etc.)in Mo powders on the formation of light corrosion spots of Mo disc surface have been studied at the same conditions for Mo powder formation and sintering and Mo bar post-working according to the phenomena and data during powder prepartion.

Abstract:The 904~# ceramic-glass coating is studied to protect titanium alloy at high temperature. The samples coated and uncoated were compared for oxygen content, oxygen polluted layer thickness, microstructure and micro-hardness by using Auger electron, X-ray, metallograph, as well as micro-hardness analyse. It is proved that the 904~# coating has a good protecting ability.

Abstract:A method of quality apprarisal for gold products was introduced and several useful formulas for purity calculation, impurity element-estimation and temperature effects have been also deduced.

Abstract:成功地研制了一種新型NiTi形狀記憶合金螺釘并已臨床應(yīng)用了150例,經(jīng)3年多考核,未發(fā)現(xiàn)骨不連及股骨頭缺血壞死現(xiàn)象。