The recently developed post-densification cold-working and annealing process for ceramic materials,the controlled-fracture forming process is reviewed,and the emphasis is taken to elucidate the history,and the theoretical and experimental fundament of the

In the light of the valence electron structures and bond energy calculated by the empirical electron theory of solids and molecules(E.E.T),the relationship of embrittlement with the bond structures and electron distributions in Fe3Al and FeAl intermetalli

A nano-composite containing a-Ti and Ti3Si phases has been produced by annealing the as-quenched amorphous Ti80Si20 alloy containing 6mg g(-1) Nd.The detailed crystallization behaviour of the amorphous alloy,which produced by using an arc-melting piston a

The internal friction of the amorphous Pd77.5 Cu6.0 Si16.5 alloy (a-PdCuSi) was measured with a conventional torsion Pendulum(Ke torsion pendulum)in ascending temperatres and it was evident that there were two internal friction Peaks (p1 and p2 peaks) nea

The oxidation of two Ni-Nb alloys containing 150 and 300 mg / g Nb has been studied at 600 -800℃ in H2 mixture providing an oxygen pressure of 1.01×10~(-4)fPa at 600℃ and 1 .01 fPa O2 at 700 and 800℃,which are always below the dissociation pressure of Ni

Non-steady state evolution of crystal growth is still a problem seldom concerned by people in solidification,particular in the region of subhigh growth velocity after cell to dendrite transition. However,the final microstructure of materials is affected s

From Cd-Te binary phase diagram,CdTe-Cd phase diagram and its parameters are obtained.By discussing the solute redistribution during CdTe crystal growth from CdTe solutions with different amount of extra Cd in Bridgman process,the solubility of Te in CdTe

ゾЯ际跹芯?##2@范新会,蔡英文,魏朋义,李建国,傅恒志$西北工业大学凝固技术国家重点实验室##3利用自制的小型单晶连铸设备,成功的制造出自径8mm,长8—10m的单晶Al线材.该技术的关键是用一个加热铸型和一个与之分离的冷却器代替传统连铸中的水冷结晶器使加热铸型内壁温度保持在熔点以上某一温度,避免型壁形核,同时在冷却器与铸型出口之间造成一个轴向温度梯度,形成定向凝固条件铸锭在离开铸型出口后的一小段距离内,表面仍呈液体状态,凝固后的铸锭表面光滑,呈镜面状态,故该技术属于一种Near-Net-Shap

The ribbons of Ni0.53 Al0 .47 Ni0.6 Al0.4 intermatallic compounds have been prepared by single roller rapidly solidified technology.Their composition and morphology have been investigated.TEM shows that the ribbons have the B2 structure;SEM shows that the

Enlighted by the wonderful phenomina of self-healing ability of living organisms,some research work have been made in attempt to realize biomimetic healing of engineering materials.With the method of high temperature brazing,the fatigue cracks of Co-base

The precipitate in rapidly solidified Al-5Fe-2Ni alloy has been investigated by means of Mossbauer spectroscopy and X-ray diffraction.It has been identified as a ternary compound Al9FexNi(2-x)(0 < x <2) with monoclinic crystal lattice and parameters a = 0

Irradiance and temperature fields are calculated for large area diamond growth by HFCVD.The results show that linear size of uniform irradiance(temperature) region in X and Y directions in sample plane increases more quickly than that of region of high ir

The surface topography and graphite atomic lattice of the graphite films prepared under different high temperature and elongation have been investigated by AFM.The surface features on a large scale are observed and the atomic resolution images are obtaine

Undoped nanocrystalline silicon nitrogen(nc-SiNx:H)films were prepared by rf glow discharge of heavily hydrogen(H2)diluted silane(SiH4) and nitrogen (N2).The volume fraction of the crystalline phase and mean grains size were varied from 58%-14% and 10nm-5

In this paper,Ca2 Fe2 O5 (C2 F), Ca2Fe1.43 Al o.57 O5 and Ca2Fe1.28 Al0.72O5 in Ca2Fe(2-x) AlxO5system are investigated with a new SCC-DV-Xa method.The computational models are octahedron and tetrahedron.Through computation with a CYBER-930 computer,follo

Nano ZrO2 powder were prepared by precipitation method.BET,TEM,XRD and ESR techniques were used to characteristic the properies of the powder.It shows that nano ZrO2 has two kinds of ESR signals,which are assigned to the Zr(+3) and Fs-center paramagnetic

A microstructural evaluation of a low-voltage ZnO varistor ceramic was made by scanning and transmission electron microscopy.It is suggested that the ZnO grains are mostly in direct contact with each other and that the intergranular phase is located prima

Non-feroelectric binary system piezoelectric,single crystal Al(0.88)Ga(0.12) PO4 was grown from solution by slow heating method.The crystal composition and structure were analyzed by means of atomic obsoletion spectroscopy,Rutherford back scattering and X

The influences of Y-PSZ content on densification and mechanical properties of Y-PSZ containing A12O3 prepared with nanopowder have been investigated.It is shown that additing Y-PSZ to A12O3promotes densification of A12O3 and decreases sintering temperatur

The phase structure and distribution along the thickness direction of Ti-Al-N functional gradient coatings were studied in this paper.It is shown that there are three phases,Al,(Ti,Al)N and (Ti2Al)N,in the Ti-Al-N functional gradient coatings,and there ar

A series of polyurethane/epoxy resin(PU/EP)IPN were prepared.The IPN exhibited single glass transition temperatures in high temperature regions estimated by DSC,TMA and dynamic viscoelastomer.The correlation of phase behavior of IPN and their breaking ten

TiB2/25SiCw ceramic composite was fabricated by hot pressing technique.Substantial improvements in fracture toughness and bending strength were obtained for the composite compared with pure TiB2 ceramic.Considerable improvement in fracture toughness at el

The 25SiCw/LD2 composites is fabricated using squeeze casting method and then hot extruded.The superplastic behavior of it was investigated under temperature condition from 500t to 580℃and strain-rates ranging from 8.33 ×10~(-4)to 8.33×10~(-3)s~(-1)in a c

SiC fibre reinforced Ti-15-3 composite was prepared by vaccum hot press diffusion-bonding technique.SiC fire,Ti-15-3 matrix and composite was metallographically examined. Reaction zone of interface between fibre and matrix was observed.It is identified th

The thermal stability of Buckytube was investigated in detail by means of DTA and through the Fe / Buckytube composite fabricated by casting. Exprimental results showed that buckytube is stable under 1400℃ at the atmosphere of Argon.In Fe/Buckytube compos