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Temperature Dependent Work-hardening Behaviour in an Fe-Mn-Si-Cr-Ni Shape Memory Alloy

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Journal of Materials Science & Technology 1995年第4期11卷 304-306页

作者： Lijian RONG Yiyi LI and changxu shi (Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China) Inst of Metal Research Chinese Acad of Sciences Shenyang China

The work-hardening behaviour in an Fe-Mn-Si-Cr-Ni alloy has been investigated using tensile test at different temperatures and TEM observation. It was found that besides the intersection of εmartensite, the intersections of ε martensite with stacking fault and the cross-slip of dislocation which is difficult to occur in the alloy with low stacking fault energy are also important factors to the temperature dependent work-hardening behaviour.

关键词： Work Mn Fe Temperature Dependent Work-hardening Behaviour in an Fe-Mn-Si-Cr-Ni Shape Memory Alloy Cr Si Ni

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 8090 Al-Li ALLOY

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Acta Metallurgica Sinica(English Letters) 1992年第2期5卷 89-94页

作者： LIU Yulin ZHANG Yun ZHAO Hong’en HU Zhuangqi shi changxu Institute of Metal Research,Academia Sinica,Shentang,China Institute of Metal Research Academia Sinica Shenyang China

The change of mechanical properties of the 8090 Al-Li alloy influenced by aging is attributed to the change of δ′-phase particle size and the precipitation of S′-*** δ′-phase may easily precipitate and rapidly grow,but the S′-phase can only precipitate with a longer stage of *** precipitation of S′-phase would be promoted by cold working prior to ag- *** co-precipitation of δ′- and S′-phase could improve the strength and plastieity of the alloy,for which aging at 190℃.for 20—30 h seems to be *** addition,the precipitate free zone( PFZ)can form at high angle grain boundary and its width is over 200 nm in peak aging *** at sub-grain boundary,the formation of PFZ is difficult.

关键词： Al-Li alloy aging microstructure mechanical properties

酶联免疫吸附和胶体金技术对黄曲霉毒素M1检测的结合验证

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中国乳业 2024年第1期 69-72,77页

作者：乔宽王路阳王艳飞张云鲜时长旭蒙牛乳业(焦作)有限公司河南焦作454100

[目的]为准确完成生牛乳中黄曲霉毒素M1检测。[方法]对比分析酶标仪、胶体金读数仪检测生牛乳中黄曲霉毒素M1的处理过程和检测数据。[结果]发现2种方法检验操作过程各有优劣,检测结果能满足不同需求。酶标仪可用于半定量检测,并进行精... 详细信息

[目的]为准确完成生牛乳中黄曲霉毒素M1检测。[方法]对比分析酶标仪、胶体金读数仪检测生牛乳中黄曲霉毒素M1的处理过程和检测数据。[结果]发现2种方法检验操作过程各有优劣,检测结果能满足不同需求。酶标仪可用于半定量检测,并进行精准检测和半定量复核。胶体金读数仪适合快速定性筛查。[结论]2种方法可配合使用,相互补充,灵活运用设备优势,高效完成检测需求。

关键词：酶标仪胶体金读数仪黄曲霉毒素M1 生牛乳

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FOREWORD

Progress in Natural Science:Materials International 1991年第1期 1-2页

作者： shi changxu Editor-in-Chief

In order to improve the quality of scientific and technological research,promote the mo-bility of technical personnel and enhance the cooperation among universities,research insti-tutes and enterprises in China,the State Planning Commission(SPC)of PRC started an in-tensified investment for the establishment of the state key laboratories(SKL)since 1984 insome research institutes of the Chinese Academy of Sciences,some universities directly under

关键词： In SPC FOREWORD

Brain Transcriptome Analysis Reveals Metabolic Changes Adapting to Hyperhaline or Hypohaline Environments in Spotted Scat(Scatophagus argus)

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Journal of Ocean University of China 2024年第3期23卷 755-765页

作者： LIN Ting ZHAI Yi TIAN changxu JIANG Dongneng shi Hongjuan JIANG Mouyan LI Guangli DENG Siping Fisheries College Guangdong Ocean UniversityZhanjiang 524088China Guangdong Research Center on Reproductive Control and Breeding Technology of Indigenous Valuable Fish Species Zhanjiang 524088China Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals Zhanjiang 524088China

The fish brain is crucial for adjusting to environmental *** changes play a vital role in the adaptation to salinity change in aquatic ***,few studies have evaluated the responses of the fish brain to salinity *** evaluate the response to various salinities,spotted scat(Scatophagus argus)was cultured in water with salinity levels of 5(low salinity:LS),25(control group:Ctrl),and 35(high salinity group:HS)for 22 *** brain transcriptome was *** total,1698 differentially expressed genes(DEGs)were identified between the HS and Ctrl groups,and 841 DEGs were identified between the LS and Ctrl *** analysis showed that the DEGs in the HS *** comparison were involved in steroid biosynthesis,terpenoid backbone biosynthesis,fatty acid biosynthesis,ascorbate and aldarate metabolism,other types of O-glycan biosynthesis,and fatty acid *** and dicarboxylate metabolism,one carbon pool by folate,steroid biosynthesis,and cysteine and methionine metabolism were significantly enriched in the LS *** ***,the genes related to metabolism(acc,fas,hmgcr,hmgcs1,mvd,soat1,nsdhl,sqle,cel,fdft1,dnmt3a and mtr)were significantly up-regulated in the HS *** *** genes related to metabolism(lipa,sqle,acc,fas,bhmt,mpst,dnmt3a,mtr,hao2,LOC111225351 and hmgcs1)were significantly up-regulated,while hmgcr and soat1 were significantly down-regulated in the LS *** *** results suggest that salinity stress affects signaling pathways and genes’expressions involved in metabolic processes in the brain,and the differences in metabolism play an important role in adaptation to hyperhaline or hypohaline environments in spotted *** research provides a comprehensive overview of transcriptional changes in the brain under hyperhaline or hypohaline conditions,which is helpful to understand the mechanisms underlying salinity adaptation in euryhaline fishes.

关键词： Scatophagus argus brain salinity transcriptome analysis

Analysis of Interfacial Coating Effect on Thermal Stress in Composites

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Journal of Materials Science & Technology 1993年第2期9卷 96-100页

作者： Yuqing WANG+ Benlian ZHOU Zuoming WANG changxu shi, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China

A preliminary model for the analysis of thermo-mechanical behaviour of interfacial coatings on the fibers in unidirectional composites have been developed on the solution of thermo-elastic mechan- ics. Thermal stress would be introduced into the composite during cooling because of the mismatch of thermo-mechanical properties among their components. The low modulus coating can effectively reduce the interracial stress caused by different thermal expansion coefficient between fibers and ma- trix, no matter how high or low the expansion coefficients of coatings are in CF/Al and SiC/Ti composite systems, however, high modulus coating can decrease the interfacial compressive stress, only when the thermal expansion coefficient of coating is lower.

关键词： composite thermal stress interfacial coating

ACOUSTIC EMISSION AND HYDROGEN EVOLUTION DURING SOLIDIFICATION OF ALUMINUM ALLOYS

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Acta Metallurgica Sinica(English Letters) 1989年第2期2卷 137-142页

作者： ZHOU Zhao JI shichen HU Zhuangqi shi changxu (C.H.shih) Institute of Metal Research,Academia Sinica,Shenyang,China

Study of the solidification process of both Al-Si and Al-Cu alloys proved the presence of acoustic emission *** peaks of count rate have been *** total counts of both peaks increase with the increasing hydrogen content of the *** mechanism of producing the acoustic emission has been *** the same time,results obtained by oth- er techniques strongly support the good correlation between the acoustic emission and hydrogen releasing during *** bubble nucleation between dendrite arms is the main cause of the first peak,while the fracture of the bridge connecting the interdendrites at the later stage of solidification is the main cause of the second *** is probably due to the hydrogen evolution and accumulation to create high pressure in the interdendritie region.

关键词： aluminium ahoy acoustic emission solidification hydrogen in alloys

TOUGHENING OF CAST Ni_3 Al-BASE ALLOYS

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Acta Metallurgica Sinica(English Letters) 1992年第6期5卷 468-470页

作者： ZHOU Yizhang ZHANG Tianxiang ZHU Yaoxiao HU Zhuangqi shi changxu Institute of Metal research,Academia Sinica,Shenyang,China Assistant Professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China Inst of Metal Research Acad Sinica Shenyang China

Investigation was made of the ductility and microstructure of a series of cast Ni_3Al-base al- loys,with 19—23 at.-% Al and other alloying *** obvious improvement on morphology,distribution,amount and size of primary Ni_3Al(γ')intermetallic compound was approached by such alloying elements such as Hf,Ti and Zr,but no more by Nb,W and Ta. The formation of ductile γ'-γ-γ' boundaries in the alloys with refined primary γ'-phase can eliminate the weakened nature of brittle γ'-γ' boundaries,and reduce the size of primary γ'-phase to tens of μ***,the ductility of the alloys,especially at intermediate tempera- tures may be markedly *** addition,an alloy free from Cr is still significantly ductile,and only its structure is *** availability of Cr to improve the intermediate temperature ductility seems to be due to the change of amount and distribution of γ-phase.

关键词： intermetallic compound Ni_3Al microstructure ductility

EFFECTS OF B^+ IMPLANTATION ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF POLYCRYSTALLINE Ni

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Acta Metallurgica Sinica(English Letters) 1993年第2期6卷 86-91页

作者： CHEN Lifan BA Tu shi changxu State Key Laboratory for Fatigue and Fracture of Materials,Institute of Metal Research,Academia Sinica,Shenyang,China Doctorate Student.Institute of Physics.Academia Sinica,Beijing 100080,China Inst of Metal Research Acad Sinica Sheyang China

50 keV B^+ ions was implanted to polycrvstalline with 50 keV B^+ to a dose o/ 3x 10~17 ions/cm^2 at room *** specimens with and without B^+implantation were tested in micro-hardness and load or unload tensile fatigue under stress-controlled eondition. The surface layer structure was observed with IMA,SEM and TEM before and after implantation and/or *** B^+ implanted surface region consists of amorphous Ni-B phase,Ni_3B and Ni_4B_3 second phases,and damage *** corresponding measurements indicate that both surface micro-hardness and endurance limit of the specimens have increased after *** with unimplanted specimens under the same fa- tigue condition,all implanted specimens show the smallest overall fatigue *** cyclic loading at room temperature can lead to migration of implanted B^+ out surface layer and reerystallization of amorphous Ni-B phase,Possible strengthening *** these ex- perimental results were discussed.

关键词： ion implantation fatigue polycrystalline Ni implanted layer