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Abstract:The electrochemical property of zir caloys is one of the most important fa ctors that affect the safe function o f nuclear reactor.To systematically study the influence of irradiation damage on the electro chemical property of zircaloys and g rope for the new way to improve it,the survey of effects of irradiation-in-pile on the electrochemical pro perty of zircaloys is offered,and th e mechanism of irradiation damage in piles is studied.Influence of neutr on irradiation,one main irradiatio n,on the microstructure and oxidation property of zircaloys,is empha-sized.The method of simulation of neutron irradiation in piles by ion bom bardment out of piles,is characterized by short time,low expense and no pollution.The development of this method is further described,an d the means how to choose parameters o f ion bombardment tests is more deeply analyzed.

Abstract:By considering the coupled thermo -mechanical relations between temperature and deforming,a numerical sim ulation of the special long forging for 1420Al -Li alloy dur ing inverted extrusion was done by using rigid visco-plastic finite elem ent method in this paper.The relations between total load and the displacement,the distribution of s tress,strain,temperature and stra in rates during forging,which can provide useful information for the p rocess design,were gained.

Abstract:提出了一種送粉激光熔覆中熔覆層表面形狀及厚度的計算模型。將熔覆過程中固相區(qū)、兩相區(qū)和液相區(qū)作為一連續(xù)介質，用非穩(wěn)態(tài)固液相變統(tǒng)一模型來描述其流場與溫度場，并采用固定網格移動坐標來處理帶移動熱源的流動與傳熱問題。能量方程用顯焓表示，有關潛熱的非穩(wěn)態(tài)項與對流項均做為其源項處理。用Lambert—Beer定理和米氏理論計算粉末流與激光光束的相互作用，使模擬適用于送粉濃度較大的情形。數值模擬程序是在流體動力學軟件PHOENICS基礎上，通過添加源項、邊界條件、熔覆層軌跡計算以及激光束和粉末流相互作用等相應模塊實現。對鋼基底上熔覆鈷基合金Stellite6進行模擬所得到的計算結果與實驗結果基本一致。

Abstract:The influence of loading method(such as static loading,cyclic loadi ng,dynamic loading)on fatigue behaviour of Si 3 N 4 material was studied systemly.The results sh ow that the stress corrosion index(n)is different,for example,the n of the static loading is the highest,and that in cyclic loading is the lowe st.The extra defeature of material l ed by loading was also analysized.

Abstract:在工作氣壓為0．80Pa的氧氬氣混合氣氛下，改變氧與氬的流量比(O2／Ar：0．10，0．20，0．30)，在預先鍍10nm左右SiO2的普通玻璃基片上用直流(D．C．)磁控濺射法制備了300nm左右的TiO2薄膜試樣。離線在500℃、氧氣氛下對試樣熱處理2h。用X射線光電子能譜(XPS)和X射線衍射儀(XRD)分別研究了試樣熱處理前后的表面元素組成、離子狀態(tài)和物相組成，用接觸角分析儀測試了試樣在紫外光(UV)照射后的水潤濕角。

Abstract:采用懸浮真空熔煉和800℃,168h真空退火方法制備了含稀土Sm的FeSi2基金屬硅化物,并對其晶體結構、See-beck系數、電阻率進行了初步研究。實驗發(fā)現,名義組成為Fe0.6Sm0.4Si2的試樣的熱電功率因子從室溫時的0.26×10-4W·m-1K-2隨溫度上升到500℃時的1.6×10-4W·m-1K-2,比不含Sm或含Sm量很少的對比試樣高一個數量級左右。其原因被認為是由于Sm的外層4f電子的貢獻。

Abstract:基于溶液/氧化鋁界面的自催化氧化-還原反應,實現了金屬鎳在氧化鋁粉末表面上的快速化學沉積,制備了氧化鋁顆粒表面包覆鎳層的微粉產物。用X射線衍射(XRD)、掃描電子顯微鏡(SEM)、剖面金相顯微分析和傅立葉變換紅外光譜(FTIR)綜合表征了產物的形貌及結構。鎳金屬殼層由納米級大小的晶體鎳顆粒組成,厚度為2μm左右。鎳包氧化鋁產物具有類似于金屬鎳的導電性和磁學特性,其壓片電阻率近似為零;飽和磁化強度(Ms)為39.6A·m2·kg-1,剩余磁化強度(Mr)6.0A·m2·kg-1,矯頑力(Hc)為6336A/m。

Abstract:用擠壓鑄造方法制備Mullite／Al—Cu復合材料及其基體合金。用硬度測試(HB)、差示掃描量熱儀(DSC)和透射電鏡(TEM)等手段，研究了溫度和溶質原子濃度對復合材料及其基體合金時效行為的影響。結果表明：復合材料和基體合金具有相似的時效硬化曲線及相同的時效析出序列，隨時效溫度的升高，峰值硬度降低、析出過程加快；溶質濃度升高，峰值硬度升高、析出過程同樣得到加快；纖維除了能明顯提高Al—Cu合金的時效硬度外，還能加速其時效析出過程，但對GP區(qū)的形成具有明顯的抑制作用，而對θ相的析出影響不大。

Abstract:In order to obtain dual metal slab,mi xing flow of molten metals in a mold wa s controlled by imposing a static ele ctromagnetic field from the outside of the mold,and the d ual metal slab which has different pr operties in its two sides was continu ally cast by pouring two dif-ferent molten alloys,Sn and Sn +Pb,a t the same time.The results of numerical simulation show that electromag netic force acts on flow of melt in a certain height range of the mold,and the effect of magnetic field on the flow of the melt is different at different area of the mold;When magnetic flux density B is 0.2T,the flow of the melt at exit of the nozzle is strongly suppressed,d epth of jet is decreased,so when B is more than 0.2T,ideal brake effect is achieved.

Abstract:The magnetic properties and structu res of sputtered and annealed TbCo th in films have been studied.The resul ts show that the film will be changed from the amorphous to the polycrystalline,a nd oriented with(100)plane.The contents of Tb and Co for the film are not almost changed after vacuum annealing,and a change of the easy axis of the film from out-of-plane to in-plane is found.

Abstract:A novel rapidly solidified Ti 5 Si 3 /NiTi intermetallic composite coating was fabricated on substrate of a t itanium alloy BT9by laser cladding using the Ni-14Ti-6Si allo y powders.Microstructure of the coa ting was characterized by OM,SEM,XR D and EDS.Wear resistance of the coating was tested under dry sliding wear condition at room tempera ture.The results indicate that the l aser clad intermetallic composite coating has a homogeneous rapidly so lidified microstructure consistin g of Ti 5 Si 3 primary particles uniformly distributed in the NiTi matrix,and is metallurgically bonded to the titanium substrate.The laser clad inte rmetallic composite coating has hig h hardness and excellent wear re-sistance under dry sliding wear test condition.The excellent wear resis tance of the laser clad Ti 5 Si 3 /NiTi intermetallic composite coating is attributed to the high hardness and s trong atomic bonding of the reinforc ing Ti 5 Si 3 phase and to the strain-induced martensite transformation of the NiTi intermetallic matrix.

Abstract:研究了多向反復鍛造對7075鋁合金顯微組織的細化作用。結果表明，經多向反復熱鍛，7075鋁合金的晶粒尺寸可以減小到2μm以下，并具有良好的熱穩(wěn)定性。淬火時效后，在強度與常規(guī)狀態(tài)相當的情況下，拉伸伸長率可達18％。

Abstract:選擇了1種SiO2-MgO-Al2O3-K2O-CaO-P2O5-F體系玻璃成分，制備了不同ZnO添加量的齒科滲透陶瓷用可切削生物微晶玻璃。結果表明，添加9％的ZnO，可使母玻璃的熔化澄清溫度降至1300℃，降低了干壓成型的納米α—氧化鋁多孔坯體的玻璃滲透溫度；晶化后的微晶玻璃呈現出獨特的球狀組織特征，析出相主要為云母、氟磷灰石、假藍寶石和輝石相等。該體系微晶玻璃兼具良好的切削性能和較高的抗彎強度。

Abstract:A long persistent phosphorescence S rAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor powder was prepared by high temperature solid state reaction in a reducing atmosphere.XRD research o n its structure indicates that all th e synthestized aluminate is SrAl 2 O 4 crystal.The study of SrAl 2 O 4 :Eu 2+ ,Dy 3+ spetra indicates that the luminescence spectra of SrAl 2 O 4 :Eu 2+ ,Dy 3+ is the broad band spectra peaking at 520nm,and the ex-citation spectrum ranges from 300nm to 500nm.The measurement of the phosphorescence shows that the persiste nt time of the phosphores-cence lasts more than 12hours.The re sistance of SrAl_2O_4:Eu~(2+),Dy~(3+) to temperature and water was also stu died.

Abstract:通過讓氫氣流經氘化鈀床，在床出口端間隔取樣分析的方法，研究了室溫(～22℃)下鈀床排代回收和裝載氘的性能。結果表明，氣—固相間的氫、氘交換過程可以采用塔板模型進行描述；22℃下鈀具有較大的氫同位素交換速率，氫(氘)的排代流速為1．8L／min時，回收率為80％的氘純度可以達到99％，排代氣量為鈀床吸氫量的3．0倍時，氘的裝載純度可以達到99％。

Abstract:Some initial researches on the laser cladding process of GdGd_5Si_2Ge_2/Gd compounds were made in this paper.Experiment results indicate that good metallurgical bonding can be obtained between the Gd_5Si_2Ge_2 alloy and Gd base;on the Gd base whose minimal thickness is not less than 1mm,the dilution of t he cladding can be kept about 10%.

Abstract:采用變截面薄板試樣，研究了4種氫含量對2種新型鈦合金強度和塑性的影響。發(fā)現氫對Ti—2Al—2．5Zr強度的影響不大，卻能較大幅度地提高Ti—4Al—2V的強度，增幅可達16％左右。氫含量升高使2種鈦合金的斷面收縮率下降：α β兩相鈦合金的氫脆敏感性在氫含量大于150μg／g后大于單相的α鈦合金。認為鈦合金氫致硬化主要來源于固溶的原子氫，而鈦合金的氫脆主要來源于晶界析出的氫化物。

Abstract:A rapidly solidified Cr 2 Ni 3 Si /Cr 3 Si metal silicide composite coating was fabricated on an austenitic stainless steel substrate by laser cladding and using Cr-Si-Ni element al powder blend.The laser clad Cr 2 Ni 3 Si /Cr 3 Si metal silicide composite coating has a homogenous mi-crostructure consisting of Cr 3 Si primary dendrites and the interdendritic Cr 2 Ni 3 Si matrix,and is metallurgically bonded to the substrate.The volume fraction of primary Cr 3 Si dendrites has a remarkable influence on hardness and wear resistance o f the laser clad composite coating.T he higher the volume fraction of Cr 3 Si,the higher the hardness and the we ar resistance of the laser clad composite coating.Because of the presence of large amount of hard,wear and oxidation resistant primary Cr 3 Si dendrites,the laser clad Cr 2 Ni 3 Si /Cr 3 Si metal silicide composite coating has excellent high-tempera ture wear resistance under high-tem perature sliding wear test conditio ns.

Abstract:According to clinical requirements for medical titanium alloys and flaw s existing in present medical titani um alloys,a new titanium alloy has been designed and prepared.Zr,Nb,Ta were selected for composing elements of the titanium alloy.Ti tanium alloy' s nominal composition is Ti-12.5Zr-2.5Nb-2.5Ta.Micrographs and mechanical pro perties of the new titanium alloy were analyzed and tested,the result shows that mechanical properties can meet design requirements.