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Oxidization resistance of Ni76Cr19AlTi valve alloy at temperatures under operating mode of heavy-duty engines

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Rare Metals 2007年第1期26卷 45-50页

作者： ZHU Yuanzhi yin zhimin HUANG Jiwu TENG Hao School of Materials and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China School of Materials Science and Engineering Central South University Changsha 410083 China

The oxidization resistance of the Ni76Cr19A1Ti alloy was studied by a static oxidization experiment at 600-800℃. The results show that the oxidation behavior of the alloy can be explained by a kinetic equation：（△m/S）2 = Kpt ＋ C, where Kp is a kinetic constant of the nickel-base alloy. The higher the experimental temperature, the higher the value of Kp. It is discovered that the microstructure of the oxide scales is compact and the thickness of it is less than 10 μm The oxidization of the alloy is in the first grade. It is also found that the oxide scales are mainly composed of Cr2O3 and TiO2. Chrome and titanium react more easily with oxygen at temperatures under the operating mode.

关键词： nickel-based alloy exhaust valve, heavy-duty engine, operating mode oxidation kinetics

Effect of Sc and Zr on the in-plane anisotropy of Al-Mg-Mn alloy sheets

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Rare Metals 2005年第3期24卷 229-234页

作者： PENG Yongyi yin zhimin YANG Jin DU Yuxuan School of Physics Science and Technology Central South University Changsha 410083 China School of Material Science and Engineering Central South University Changsha 410083 China

The Al-Mg-Mn alloy sheets with and without trace Sc and Zr were investigated by means of tensile test, X-ray diffraction, optical microscope, and transmission electron microscope. The indexes of in-plane anisotropy （IIPA） of their tensile mechanical properties were calculated and their inverse pole figures were obtained by Harris method. The two alloy sheets have the same law of in-plane anisotropy and remarkable in-plane anisotropy of mechanical properties, and the IIPA of the alloy sheet with Sc and Zr is bigger than that of the alloy sheet without Sc and Zr. The relationships of the in-plane anisotropy and the anisotropy of the crystallographic texture were analyzed based on the model of monocrystal. It is the common action of the anisotropy of crystallography and microstructures that causes the in-plane anisotropy of their mechanical properties, but the major cause is the { 110 }〈112〉 crystallographic texture. The trace Sc and Zr can promote the formation and stabilization of the { 110 } 〈 112〉 texture, inhibit the formation of the { 100 } 〈001 〉 texture, and increase the in-plane anisotropy of the alloy sheet containing trace Sc and Zr.

关键词： in-plane anisotropy A1-Mg-Mn Sc Zr inverse pole figure {110}〈112〉 texture {100}〈001〉 texture

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铁代谢与孕中晚期妊娠期糖尿病发生的关系

江苏医药 2024年第3期50卷 263-266,271页

作者：陈丹丹蒋伟菊尹智敏南京医科大学附属妇产医院(南京市妇幼保健院)计划生育科江苏210004

目的探讨孕早期影响孕中晚期妊娠期糖尿病(GDM)发生的相关因素及其对GDM的早期预测价值。方法根据孕24~28周口服葡萄糖耐量试验(OGTT)检测结果,99例单胎孕妇分为GDM组(诊断GDM,45例)和对照组(OGTT正常,54例),比较两组患者一般资料及孕早... 详细信息

目的探讨孕早期影响孕中晚期妊娠期糖尿病(GDM)发生的相关因素及其对GDM的早期预测价值。方法根据孕24~28周口服葡萄糖耐量试验(OGTT)检测结果,99例单胎孕妇分为GDM组(诊断GDM,45例)和对照组(OGTT正常,54例),比较两组患者一般资料及孕早期(孕12周)Hb和血清铁蛋白(SF)、孕晚期(孕36周)Hb和FBG。采用多因素logistic回归分析GDM发生的影响因素。绘制ROC曲线分析孕早期BMI、Hb和SF单独及联合检测对GDM的早期预测价值。结果GDM组患者孕早期体重、BMI及新生儿体重高于对照组(P<0.05)。GDM组孕早期Hb和SF、孕晚期Hb和FBG均高于对照组(P<0.05)。多因素logistic回归分析结果显示,孕早期BMI、Hb和SF升高是孕妇孕中晚期发生GDM的独立危险因素(P<0.05)。孕早期BMI、Hb、SF单独和联合检测预测GDM发生的AUC分别为0.708[95%CI(0.600~0.816),P<0.05]、0.678[95%CI(0.572~0.784),P<0.05]、0.658[95%CI(0.550~0.766),P<0.05]和0.785[95%CI(0.692~0.877),P<0.05]。结论孕早期BMI、Hb和SF升高与GDM的发生存在一定的关系,三者联合检测可以提高对GDM的预测价值。

关键词：妊娠期糖尿病血红蛋白血清铁蛋白

MECHANICAL　PROPERTIES　AND　MICROSTRUCTURES　OF　Al-Mg-Li-Zr　ALLOYS-CONTAINING　SILVER

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中国有色金属学会会刊：英文版 1994年第4期4卷 78-82页

作者： Zhang, Siqi yin, zhimin Shen, Jian Lu, Bin Liang, ying Central South Univ of Technology Changsha China

ＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＯＦＡｌ－Ｍｇ－Ｌｉ－ＺｒＡＬＬＯＹＳ－ＣＯＮＴＡＩＮＩＮＧＳＩＬＶＥＲ￥Ｚｈａｎｇ，Ｓｉｑｉ；Ｙｉｎ，Ｚｈｉｍｉｎ；Ｓｈｅｎ，Ｊｉａｎ；Ｌ... 详细信息

ＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＯＦＡｌ－Ｍｇ－Ｌｉ－ＺｒＡＬＬＯＹＳ－ＣＯＮＴＡＩＮＩＮＧＳＩＬＶＥＲ￥Ｚｈａｎｇ，Ｓｉｑｉ；Ｙｉｎ，Ｚｈｉｍｉｎ；Ｓｈｅｎ，Ｊｉａｎ；Ｌｕ，Ｂｉｎ；Ｌｉａｎｇ，Ｙｉｎｇ（...

关键词： Al-Li alloys silver microstructures mechanical properties

ELECTRON DIFFRACTION PATTERNS ANALYSIS OF PRECIPITATES IN LD_(10) ALLOY

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中国有色金属学会会刊：英文版 1995年第3期5卷 119-123页

作者： Jin, Tounan yin, zhimin(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083) Central South Univ of Technology Changsha China

ＥＬＥＣＴＲＯＮＤＩＦＦＲＡＣＴＩＯＮＰＡＴＴＥＲＮＳＡＮＡＬＹＳＩＳＯＦＰＲＥＣＩＰＩＴＡＴＥＳＩＮＬＤ_（１０）ＡＬＬＯＹ￥Ｊｉｎ，Ｔｏｕｎａｎ；Ｙｉｎ，Ｚｈｉｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳ... 详细信息

ＥＬＥＣＴＲＯＮＤＩＦＦＲＡＣＴＩＯＮＰＡＴＴＥＲＮＳＡＮＡＬＹＳＩＳＯＦＰＲＥＣＩＰＩＴＡＴＥＳＩＮＬＤ_（１０）ＡＬＬＯＹ￥Ｊｉｎ，Ｔｏｕｎａｎ；Ｙｉｎ，Ｚｈｉｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒ?..

关键词： precipitate simulated diffraction pattern transformation matrix

A　NEW　PARTICLES　ADDING　TECHNIQUE　FOR　PREPARATION　OF　METAL　MATRIX　COMPOSITE　USING　SPRAY　DEPOSITE

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中国有色金属学会会刊：英文版 1996年第2期6卷 123-124页

作者： Chen Shizhu yin zhimin(Department of Materials Science and Engineering ,Central South University of Technology, Changsha 410083) Department of Materials Science and Engineering Central South University of Technology Changsha 410083 China

ＡＮＥＷＰＡＲＴＩＣＬＥＳＡＤＤＩＮＧＴＥＣＨＮＩＱＵＥＦＯＲＰＲＥＰＡＲＡＴＩＯＮＯＦＭＥＴＡＬＭＡＴＲＩＸＣＯＭＰＯＳＩＴＥＵＳＩＮＧＳＰＲＡＹＤＥＰＯＳＩＴＥＣｈｅｎＳｈｉｚｈｕ；ＹｉｎＺｈｉｍｉｎ（Ｄｅｐａｒ... 详细信息

ＡＮＥＷＰＡＲＴＩＣＬＥＳＡＤＤＩＮＧＴＥＣＨＮＩＱＵＥＦＯＲＰＲＥＰＡＲＡＴＩＯＮＯＦＭＥＴＡＬＭＡＴＲＩＸＣＯＭＰＯＳＩＴＥＵＳＩＮＧＳＰＲＡＹＤＥＰＯＳＩＴＥＣｈｅｎＳｈｉｚｈｕ；ＹｉｎＺｈｉｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳ...

关键词： atomize reinforced particles spray deposition

MICROSTRUCTURE OF DIFFERENTLY TREATED Al-Mg-Sc-Zr ALLOYS

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Journal of Central South University 1997年第1期9卷 24-27页

作者： Jie Zhang zhimin yin Yonghong Zhang Yongzheng Gao Qinglin Pan 1. Department of Materials Science and Engineering Central South University of Technology 410083 Changsha China

The microstructures of different treated Al-5Mg-0.5Sc-0. 1Zr alloys have been studied with opticalmicroscopy and transmission electron microscope (TEM). Coherent particles with the matrix were found inas-cast sample. composite Al3Sc/Al3Zr particles were found after 13 h homogenized treatment under 470℃.Coherent precipitates pinned dislocations and low-angle grain boundaries. and then restrained recrystallization. All kinds of particles of different treatments were not larger than 40nm. After high-temperaturestabilization treatments, most particles remain coherent with the matrix. The reasons of microstructurechange at different treated conditions have been analyzed.

关键词： Al-Mg-Sc-Zr alloy microstructure Al_3 (Sc,Zr) coherent and non-coherent

FLUID KINETICS PRINCIPLE AND DESIGN CRITERIA OF ATOMIZER

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中国有色金属学会会刊：英文版 1996年第3期6卷 108-112页

作者： Chen Shizhu Zhou NaiJun yin zhimin(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083) Department of Materials Science and Engineering Central South University of Technology Changsha 410083 China

ＦＬＵＩＤＫＩＮＥＴＩＣＳＰＲＩＮＣＩＰＬＥＡＮＤＤＥＳＩＧＮＣＲＩＴＥＲＩＡＯＦＡＴＯＭＩＺＥＲ￥ＣｈｅｎＳｈｉｚｈｕ；ＺｈｏｕＮａｉＪｕｎ；ＹｉｎＺｈｉｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎ... 详细信息

ＦＬＵＩＤＫＩＮＥＴＩＣＳＰＲＩＮＣＩＰＬＥＡＮＤＤＥＳＩＧＮＣＲＩＴＥＲＩＡＯＦＡＴＯＭＩＺＥＲ￥ＣｈｅｎＳｈｉｚｈｕ；ＺｈｏｕＮａｉＪｕｎ；ＹｉｎＺｈｉｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，...

关键词： atomizer fluid medium fluid kinetics vorticit

PHYSICAL METALLURGY OF MULTISTAGE RSP Al-Li BASED ALLOYS

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Transactions of Nonferrous Metals Society of China 1992年第1期2卷 77-83,97页

作者： yin,zhimin Zhang,Xinmin Chen,Zhenhua Zuo,Tieyong Central-South University of Technology Changsha 410083China

Bascd on serires authors study ofAl—Li alloys in recent years,the formation theory of powders,characteristics,powder compaction,the microstructures and the mechanical behaviors of RSP Al-Li based alloys analyzed and ... 详细信息

关键词： Rapid Solidification Al-Li alloy Powder metallurgy microstructure mechanical property