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ANELASTIC RELAXATIONS ASSOCIATED WITH LOCAL DISORDERING AT GRAIN BOUNDARIES

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Acta Metallurgica sinica(English Letters) 1991年第2期4卷 79-85页

作者： CHENG bolin GE Tingsui (T.S.Ke) Laboratory of Internal Friction and Defects in solids,institute of solid state physics,academia sinica,hefei,china Professor Laboratory of Internal Friction and Defects in solids,institute of solid state physics,academia sinica,hefei,230031

Internal friction and micro-creep measurements were performed with high-purity aluminium bamboo-crystal *** relaxation strength was found to decrease with the decrease of temperature and became zero at about 0.4 T_m(T_m is the melting temperature).This re- flects the occurrence of local disordering in the bamboo boundary region at this temperature. This result conforms to the picture of grain-boundary disordering constructed by atomic simulation studies.

关键词： Grain boundary disordering internal friction micro-creep high-purity aluminium

A Study on The Optical Properties of InAs Microcrystallites Embedded in SiO2 Glass Matrix

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电子显微学报 1997年第4期 145-146页

作者： J.Z.Shi\ L.D.Zhang (institute of solid state physics,academia sinica,hefei 230031,P.R.china)

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关键词： InAs Microcrystallites Properties SiO2 Embedded

EFFECT OF AGING ON INTERNAL FRICTION,ELASTIC MODULUS AND MECHANICAL PROPERTIES OF TERNARY Mn-Cu-Al ALLOYS

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Acta Metallurgica sinica(English Letters) 1989年第2期2卷 100-107页

作者： YI Huchun GE Tingsui (T.S.Ke) institute of solid state physics,academia sinica,hefei,china GE Tingsui,Professor,Laboratory of Internal Friction and Defects in solids,institute of solid state physics,academia sinica,hefei,china

Internal friction and elastic modulus of ternary Mn-Cu-Al alloys containing 56—60 wt-% Mn,0-3.59 wt-% Al were measured with acoustic frequency,1 kHz,in the tempera- ture range of-150 to 150℃.It was found that when the specimen was aged in the temperature range under the spinodal curve within the miscibility gap(400—500℃),the internal fric- tion increases with an increase of the aging time and reaches a maximum value at a certain ag- ing time which is shorter with a higher aging *** internal friction peaks which did not appear before the aging were observed above room temperature after a definite aging *** are respectively the martensitic tranformation peak and the relaxation peak orig- inating from the stress-induced movement of the twin *** former peak shifts to- ward higher temperatures with an increase of the aging time,whereas the relaxation peak ap- pearing at 15℃,is independent of the aging time and *** activation energy as- sociated with the relaxation peak was found to be 0.56 eV which is about the same as that of the relaxation peak in binary alloy containing 90 wt-% *** was also found that the hardness,strength and the brittleness of the specimen increase when aged below the spinodal curve within the miscibility *** addition or Al enhances the strength but reduces the in- ternal friction of the specimen.A choice of suitable aging time and temperature can give an optimum compromise of high strength and high internal *** of experimental re- sults suggests that spinodal decomposition leads to Mn-rich zones in the specimen and thus causes the phase transformation and the change of mechanical properties of the specimen.

关键词： internal friction Mn-Cu-Al alloy elastic modulus mechanical properties aging

Transformations and Two Way Memory Effect Associated with Solution-treatment Temperature

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Journal of Materials Science & Technology 1993年第4期9卷 253-257页

作者： Chimei MO Zaitao LI Dept.of Materials Science and Engineering,University of Science and Technology of china,hefei 230026,chinaZhengang zhu institute of solid state physics,academia sinica,hefei,230031,china

Effect of solution treatment temperature on transformations and two way memory, effect in a Ti- 55.2 wt-%Ni alloy was investigated. The results show that with increasing the solution treatment temperature (T_s), two way memory effect (TWME) decreases continuously and temperatures of martensite and reverse, martensite transformations (MR) rise, but the temperature of R start trans- formation (parent→R) does not change. The results of the internal friction measurements indicate that when T_s=1073 K, internal friction peaks of MR and P→R transformations are larger than those of the specimens after solution-treatments at 973 and 1173 K. With increasing T_s, the de- crease of TWME can be attributed to that the defect stress field caused by the rolling fades out grad- ually and preferential martensite variants, which fit into the defect stress field, decrease. The changes of transformation temperatures and internal friction peaks with T_s are closely related to the change of defect numbers.

关键词： solution-treatment temperature internal friction two way memory effect transformation

AMORPHOUS ALLOY Al-Y-Ni FORMED BY MECHANICAL ALLOYING

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Acta Metallurgica sinica(English Letters) 1992年第10期5卷 323-326页

作者： MA Xueming YANG Yuanzheng DONG Yuanda HE Yizhen institute of solid state physics,academia sinica,hefei,china

The amorphization transformation of Al-Y-Ni system by mechanical alloying was inves- tigated in both thermodynamic and kinetic *** amorphous powder of Al-rich composition Al_(80)Y_(15)Ni_5 was formed after 70 h *** process of the amorphiza- tion was monitored by X-ray *** dependence of the amorphization on the milling intensity was also *** results show that over milling with extra-high intensity has an unfavourable effect on amorphization of the system.

关键词： mechanical alloying amorphous Al-Y-Ni alloy

ON DEGRADATION OF DUCTILITY INDUCED BY HYDROGEN IN MEDIUM CARBON STEELS

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Acta Metallurgica sinica(English Letters) 1989年第6期2卷 444-446页

作者： DU Jiaju TONG Shihua institute of solid state physics,academia sinica,hefei,china [Originally published in ACTA METALL SIN(CHINESE EDN)25(3)1989 pp A226—A228, Associate Professor,institute of solid state physics,academia sinica,hefei,china

Optical microscope,SEM and IMMA investigation show that a strong interaction between hydrogen and calcium aluminate inclusions containing MgO may occur in medium carbon *** causes the hydrogen accumulating around the ... 详细信息

关键词： hydrogen inclusion steel

CREEP CRACK GROWTH IN GH901 SUPERALLOY

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Acta Metallurgica sinica(English Letters) 1988年 59-62页

作者： WU Sifa KONG Qingping institute of solid state physics,academia sinica,hefei,china Professor,institute of solid state physics,academia sinica,hefei,china

Creep crack growth of an Fe-Nibase alloy GH901 (similar to Incoloy 901) was studiedat 650-715℃ by electrical potential *** crack initiation and growth can bedescribed by stress intensity *** the initial stress intensity K,was smaller than athreshold value K,no crack growth was detected in the testing time (20Oh).WhenKwas larger than K,the creep crack growth rate can be represented by an Arrheniustype *** activation energy for creep crack growth was found in agreementwith that for grain boundary *** by SEM shows that the path ofcrack growth is along grain *** physical origin of the threshold stress inten-sity Kand the microscopic process of creep crack growth are explained in the light ofgrain boundary diffusion mechanism.

关键词： GH901 alloy creep crack growth

MICROSTRUCTURE IN LASER FUSED HIGH SPEED STEEL W6Mo5Cr4V2(M2)

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Acta Metallurgica sinica(English Letters) 1993年第1期6卷 36-39页

作者： LIU Ning CUI Kun Huazhong University of Science and Technology,Wuhan.china DENG Zonggang hefei University of Technology,hefei,china CHENG Benpei KONG Jie institute of solid state physics,academia sinica,hefei,china Doctorate student,Department of Mechanical Engineering No.2,Huazhong University of Science and Technology,Wuhan 430074,china Huazhong Univ of Science and Technology Wuhan China

Microstructure of the deepest zone of high speed steel W6Mo5Cr4V2(M2)melt after laser fu-sion was found to be so fine as the ehill zone of a solidified *** narrower chill zoneformed,the long columnar dendrites grow into the melt and then the fine equiaxed cellularstructure appears in upper melt region nearly *** substructure of cellular grains anddendrites was observed to consist of martensite and retained austenile,while the carbides asM_6C_■ Cr_7C_3 and MC distributed at their *** is believed that the highermicrohardness up to HV_(0.1)=865-960 of the laser fused structure of the alloy is due to the oc-currence of martensite.

关键词： High speed steel W6Mo5Cr4V2(M2) laser fused treatment micrstructure

共析Al-Zn合金非平衡扩散型相变内耗和模量特征

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金属学报 1989年第2期25卷 A086-A090页

作者：朱贤方张立德中国科学院固体物理研究所

研究了淬火Al-Zn共析合金中非平衡Spinodal预相变和后继的不连续转变低频内耗特征和模量效应。在非平衡Spinodal预相变中,观察到存在着与大幅度长波长的静态浓度波相联系的Spinodal失稳并没有引起局部模量软化效应。Spinodal预转变共格... 详细信息

研究了淬火Al-Zn共析合金中非平衡Spinodal预相变和后继的不连续转变低频内耗特征和模量效应。在非平衡Spinodal预相变中,观察到存在着与大幅度长波长的静态浓度波相联系的Spinodal失稳并没有引起局部模量软化效应。Spinodal预转变共格性的出现与消失和不连续转变中相界面面积的最大值,引起各自相应的时效内耗峰,但与峰相应的模量软化效应并未发生。

关键词： A1-Zn合金内耗共析模量相变