MODEL FOR COARSENING OF SDAS AND ITS VERIFICATION IN MULTICOMPONENT SC SUPERALLOYS

ＭＯＤＥＬＦＯＲＣＯＡＲＳＥＮＩＮＧＯＦＳＤＡＳＡＮＤＩＴＳＶＥＲＩＦＩＣＡＴＩＯＮＩＮＭＵＬＴＩＣＯＭＰＯＮＥＮＴＳＣＳＵＰＥＲＡＬＬＯＹＳＭＯＤＥＬＦＯＲＣＯＡＲＳＥＮＩＮＧＯＦＳＤＡＳＡＮＤＩＴＳＶＥＲＩＦＩＣＡＴＩＯＮＩＮＭＵＬＴＩＣＯＭＰＯ...     

SURFACE REACTION，HYDROGEN DIFFUSIVITY AND ENVIRONMENTAL EMBRITTLEMENT OF INTERMETALLIC COMPOUNDS Ni_3Al AND Fe_3Al

ＳＵＲＦＡＣＥＲＥＡＣＴＩＯＮ，ＨＹＤＲＯＧＥＮＤＩＦＦＵＳＩＶＩＴＹＡＮＤＥＮＶＩＲＯＮＭＥＮＴＡＬＥＭＢＲＩＴＴＬＥＭＥＮＴＯＦＩＮＴＥＲＭＥＴＡＬＬＩＣＣＯＭＰＯＵＮＤＳＮｉ_３ＡｌＡＮＤＦｅ_３ＡｌＷＡＮＸｉａｏｊｉｎｇ；ＺＨＵＪｉａｈｏｎｇ；...     

EFFECT OF TRACE ELEMENTS P AND Mn ON THE MICROSTRUCTURE AND HYDROGEN EMBRITTLEMENT OF AN Fe－Ni－Co BASED SUPERALLOY

ＥＦＦＥＣＴＯＦＴＲＡＣＥＥＬＥＭＥＮＴＳＰＡＮＤＭｎＯＮＴＨＥＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＨＹＤＲＯＧＥＮＥＭＢＲＩＴＴＬＥＭＥＮＴＯＦＡＮＦｅ－Ｎｉ－ＣｏＢＡＳＥＤＳＵＰＥＲＡＬＬＯＹＷＡＮＧＡｎｃｈｕａｎ;ＹＡＮＧＫｅ;ＦＡＮＣｕｎｇａｎ...     

CRYSTAL STRUCTURE OF A LONG－PERIOD ORDERED PHASE IN Fe－C MARTENSITE AND COMPUTER SIMULATION OF ITS ELECTRON DIFFRACTION PATTERNS

ＣＲＹＳＴＡＬＳＴＲＵＣＴＵＲＥＯＦＡＬＯＮＧ－ＰＥＲＩＯＤＯＲＤＥＲＥＤＰＨＡＳＥＩＮＦｅ－ＣＭＡＲＴＥＮＳＩＴＥＡＮＤＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮＯＦＩＴＳＥＬＥＣＴＲＯＮＤＩＦＦＲＡＣＴＩＯＮＰＡＴＴＥＲＮＳＲＥＮＸｉａｏｂｉｎｇ；ＷＡ...     

INFLUENCE OF CYCLE PHASE TRANSFORMATION ON TEXTURE AND YIELD STRESS ANISOTROPY IN TITANIUM SHEET

ＩＮＦＬＵＥＮＣＥＯＦＣＹＣＬＥＰＨＡＳＥＴＲＡＮＳＦＯＲＭＡＴＩＯＮＯＮＴＥＸＴＵＲＥＡＮＤＹＩＥＬＤＳＴＲＥＳＳＡＮＩＳＯＴＲＯＰＹＩＮＴＩＴＡＮＩＵＭＳＨＥＥＴ￥Ｚｈｕ，Ｚｈｉｓｈｏｕ；Ｇｕ，Ｊｉａｌｉｎ；Ｃｈｅｎ，Ｎａｎｐｉｎｇ（Ｄｅｐａｒｔ...     

SOLIDIFICATION OF Zn－Pb ALLOY UNDER SIMULANT MICROGRAVITY CONDITION OF ORTHOGONAL ELECTRIC AND MAGNETIC FIELDS

ＳＯＬＩＤＩＦＩＣＡＴＩＯＮＯＦＺｎ－ＰｂＡＬＬＯＹＵＮＤＥＲＳＩＭＵＬＡＮＴＭＩＣＲＯＧＲＡＶＩＴＹＣＯＮＤＩＴＩＯＮＯＦＯＲＴＨＯＧＯＮＡＬＥＬＥＣＴＲＩＣＡＮＤＭＡＧＮＥＴＩＣＦＩＥＬＤＳ￥Ｚｈａｏ，Ｊｉｕｚｈｏｕ；Ｇｕｏ，Ｊｉｎｇｊｉｅ；Ｊｉ...     

DESIGN AND PREPARATION OF SILICON NITRIDE COMPOSITE WITH HIGH FRACTURE TOUGHNESS AND NACRE STRUCTURE

ＤＥＳＩＧＮＡＮＤＰＲＥＰＡＲＡＴＩＯＮＯＦＳＩＬＩＣＯＮＮＩＴＲＩＤＥＣＯＭＰＯＳＩＴＥＷＩＴＨＨＩＧＨＦＲＡＣＴＵＲＥＴＯＵＧＨＮＥＳＳＡＮＤＮＡＣＲＥＳＴＲＵＣＴＵＲＥＹＨｕａｎｇ；Ｈ．ＮＨａｏ；Ｙ．Ｌ．ＣｈｅｎａｎｄＢ．Ｌ．Ｚｈｏｕ（１）Ｄｅ...     

RELATIONSHIP OF THE PROPERTIES OF HOT－PRESSING C－BC_4－SiC COMPOSITE WITH THE CONTENT OF ADDITIVE Al

ＲＥＬＡＴＩＯＮＳＨＩＰＯＦＴＨＥＰＲＯＰＥＲＴＩＥＳＯＦＨＯＴ－ＰＲＥＳＳＩＮＧＣ－ＢＣ_４－ＳｉＣＣＯＭＰＯＳＩＴＥＷＩＴＨＴＨＥＣＯＮＴＥＮＴＯＦＡＤＤＩＴＩＶＥＡｌ￥Ｈｕａｎｇ，Ｑｉｚｈｏｎｇ；Ｔａｎ，Ｐｉｎｇ；Ｙａｎｇ，Ｑｉａｏｑｉｎ＋；Ｈ?..     

MEASUREMENT AND INFLUENCE FACTOR＇S ANALYSING OF INTERFACIAL STRENGTH OF COMPOSITES

ＭＥＡＳＵＲＥＭＥＮＴＡＮＤＩＮＦＬＵＥＮＣＥＦＡＣＴＯＲ＇ＳＡＮＡＬＹＳＩＮＧＯＦＩＮＴＥＲＦＡＣＩＡＬＳＴＲＥＮＧＴＨＯＦＣＯＭＰＯＳＩＴＥＳ￥ＷａｎｇＬｉｎｇｓｅｎ；ＬｉｕＲｕｏｙｕ；ＺａｎｇＪｉｎｓｅｎ；ＦａｎＹｉ（ＲｅｓｅａｒｃｈＩｎｓｔｉ...     

SENSITIVITY AND SEPARABILITY OF DEFORMATION MODELS WITH REGARD TO PRIOR INFORMATION

ＳＥＮＳＩＴＩＶＩＴＹＡＮＤＳＥＰＡＲＡＢＩＬＩＴＹＯＦＤＥＦＯＲＭＡＴＩＯＮＭＯＤＥＬＳＷＩＴＨＲＥＧＡＲＤＴＯＰＲＩＯＲＩＮＦＯＲＭＡＴＩＯＮ①ＺｈｕＪｉａｎｊｕｎＣｏｌｅｇｅｏｆＲｅｓｏｕｒｃｅ，ＥｎｖｉｒｏｎｍｅｎｔａｎｄＣｉｖｉｌＥｎｇｉｎ...     

弥散质点和SiC颗粒复合强化Al基复合材料 Ⅱ．性能和断裂特征

对机械合金化制备的Ａｌ_４Ｃ_３、Ａｌ_２Ｏ_３弥散质点和ＳｉＣ颗粒复合强化Ａｌ基复合材料进行了拉伸试验和断口分析，并测定了弹性模量和热膨胀系数．研究表明，在ＳｉＣ_ｐ／Ａｌ复合材料中引入弥散的Ａｌ_４Ｃ_３和Ａｌ_２Ｏ_３质点可以明显提高复合材料的室温和高温强度，随加入Ｃ含量的增加或Ａｌ粉氧化时间的加长，复合材料的强度提高．在Ａｌ_４Ｃ_３／Ａｌ复合材料的基础上加入ＳｉＣ颗粒可以提高复合材料的弹性模量并进一步降低其热膨胀系数．复合材料断口为大韧窝加细小韧窝的混合断口，随复合材料基体强度的增加，拉伸断口上断裂的ＳｉＣ颗粒数量增多．     

DISPERSOID AND SiC PARTICULATE STRENGTHENED Al COMPOSITES Ⅱ. PROPERTIES AND FRACTURE BEHAVIOUR

对机械合金化制备的Ａｌ_４Ｃ_３、Ａｌ_２Ｏ_３弥散质点和ＳｉＣ颗粒复合强化Ａｌ基复合材料进行了拉伸试验和断口分析，并测定了弹性模量和热膨胀系数．研究表明，在ＳｉＣ_ｐ／Ａｌ复合材料中引入弥散的Ａｌ_４Ｃ_３和Ａｌ_２Ｏ_３质点可以明显提高复合材料的室温和高温强度，随加入Ｃ含量的增加或Ａｌ粉氧化时间的加长，复合材料的强度提高．在Ａｌ_４Ｃ_３／Ａｌ复合材料的基础上加入ＳｉＣ颗粒可以提高复合材料的弹性模量并进一步降低其热膨胀系数．复合材料断口为大韧窝加细小韧窝的混合断口，随复合材料基体强度的增加，拉伸断口上断裂的ＳｉＣ颗粒数量增多．     

EFFECT OF MATRIX STRENGTHENING ON SLIDING WEAR PROPERTIES OF SiCp/2024Al COMPOSITES

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃｅｒａｍｉｃｐａｒｔｉｃｕｌａｔｅｓｒｅｉｎｆｏｒｃｅｄａｌｕｍｉｎｕｍａｌｏｙｃｏｍｐｏｓｉｔｅｓｅｘｈｉｂｉｔｈｉｇｈｓｐｅｃｉｆｉｃｍｏｄｕｌｕｓａｎｄｓｔｒｅｎｇｔｈ，ａｌｓｏｇｅｔａｓｉｇｎｉｆｉｃａｎｔｉ...     

Interface and microstructure characteristics of SiC_p/2024 aluminium alloy composite

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｉｍｐｏｒｔａｎｃｅｏｆｐａｒｔｉｃｕｌａｔｅｒｅｉｎｆｏｒｃｅｄｍｅｔａｌｍａｔｒｉｘｃｏｍｐｏｓｉｔｅｓ(ＰＭＭＣｓ)ｄｕｅｔｏｈｉｇｈｓｐｅｃｉｆｉｃｓｔｒｅｎｇｔｈ ,ｈｉｇｈｓｐｅｃｉｆｉｃｍｏｄｕｌｕｓ ,ｂｅｔｔｅｒｒｅｓｉｓｔａｎｃｅｔｏｗｅａｒａｎｄｔｈｅｒｍａｌｓｔｅａｄｉｎｅｓｓｈａｓａｔｔｒａｃｔｅｄｍｕｃｈｉｎｔｅｒｅｓｔｉｎｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｔｈｅｍａｎｕｆａｃｔｕｒｉｎｇｐｒｏｃｅｓｓｆｏｒｓｕｃｈｃｏｍｐｏｓｉｔｅｓ .Ｔｈ…     

Effect of Particle Size on Mechanical Properties and Fracture Behaviors of Age-Hardening SiC/Al-Zn-Mg-Cu Composites

15 vol.％ SiC/Al-6.5Zn-2.8 Mg-l.7Cu (wt％) composites with varying particle sizes (3.5,7.0,14 and 20 μm),i.e.,C-3.5,C-7.0,C-14,and C-20,respectively,were fabricated by powder metallurgy (PM) method and subjected to microstructural examination.The effect of particle size on mechanical properties and fracture behaviors of the T6-treated composites was revealed and analyzed in detail.Element distribution and precipitates variations in the composites with varying particle sizes were emphatically considered.Results indicated that both tensile strength and plasticity of the T6-treated composites increased first and then decreased with particle size decreasing.The C-7.0 composite simultaneously exhibited the highest ultimate tensile strength (UTS) of 686 MPa and best elongation (El.) of 3.1％.The smaller-sized SiC particle would intro-duce more oxide impurities,which would react with the alloying element in the matrix to cause Mg segregation and deple-tion.According to strengthening mechanism analysis,the weakening of precipitation strengthening in the T6-treated C-3.5 composite was the main cause of the lower tensile strength.Additionally,the larger SiC particle,the more likely to fracture,especially in the composites with high yield strength.For the T6-treated C-20 composites,more than 75％ SiC particles were broken up,resulting in the lowest plasticity.As decreasing particle size,the fracture behaviors of the T6-treated composites would change from particle fracture to matrix alloy fracture gradually.     

原位反应热压复合SiCP/MoSi2的显微结构与力学性能

以Mo粉、Si粉和C粉为原料，采用湿法混合和原位反应高温热压一次复合工艺制备了不同配比的SiCp/MoSi2复合材料，研究了该种工艺原位生成的SiC颗粒对MoSi2基体显微结构和室温力学性能的影响。结果表明：原位反应生成的适量SiC颗粒可以细化基体晶粒，改善其力学性能，与同样工艺下制备的纯MoSi2相比，含40vol%SiCp的SiCp/MoSi2复合材料室温抗弯强度是其3.4倍，含50vol%SiCp的SiCp/MoSi2复合材料室温断裂韧性是纯MoSi2的1.5倍；该种工艺的强化机制为细晶强化和弥散强化，韧化机制为细晶韧化。     

SiC颗粒增强铝基梯度复合材料的制备与性能

采用粉末冶金法制备了SiC颗粒增强铝基梯度复合材料（FGMMC），研究了该梯度复合材料的微观组织和力学性能，对FGMMC的显微组织观察表明，由于铝基体熔合成一体，因此层间没有明显的界面，具有基体的连续性，尽管基体是连续的，但是当疲劳裂纹从高SiC含量层向低SiC含量层扩展时，在过渡区发生延滞现象，通过断口和裂纹扩展路径的分析解释了此延滞现象。     

颗粒增强铝基复合材料断裂韧度研究

采用搅熔复合法制备颗粒增强铝基复合材料．对复合材料断裂韧度进行了测试。系统研究了影响该材料断裂韧度的各种影响因素：结果表明：在增强相加入量相同时．采用Sic颗粒复合材料的断裂韧度比Al2O3的影响显著，而增强颗粒质量分数越高．则复合材料的断裂韧度越低．增强颗粒尺寸越小，复合材料断裂韧度值越大。热处理状态对断裂韧度也有较大影响，人工时效比自然时效状态下的断裂韧度高。     

SiCp/Al复合材料的离心熔渗法制备及其性能

研究了反应离心熔渗法制备高体积比SiCp／Al复合材料的工艺过程及其抗弯强度。结果表明：通过适当的粒度配比，可在低温、低离心力下熔渗制备组织均匀的高体积比SiCp／Al复合材料，SiC颗粒体积分数可达到63％；复合材料的强度在很大程度上依赖于SiC颗粒尺寸及界面反应程度，合适的界面结合及细SiC颗粒的掺入有利于复合材料强度的提高；基体热处理改变了SiC颗粒所受应力状态，提高了复合材料的强度，其最高值可达519MPa。     

TiB2含量对B4C-TiB2-Al复合材料组织与力学性能的影响

通过在B4C-TiB2预烧体中真空熔渗Al制备了B4C-TiB2-Al复合材料,研究了TiB2含量对复合材料显微组织和力学性能的影响.结果表明: B4C-TiB2-Al复合材料主要由B4C,TiB2,Al和Al3BC等相组成;随着TiB2含量的增加,复合材料的HRA硬度逐渐降低,抗弯强度逐渐增大,断裂韧性先增大后稍微降低,当TiB2含量为40%(质量分数)时,复合材料的气孔率、硬度HRA、抗弯强度和断裂韧性分别为1.32%,80.3,559.4 MPa和7.83 MPa·m1/2;延性Al的加入,裂纹的偏转和分叉、B4C和TiB2晶粒的细化以及B4C基体和TiB2晶粒热膨胀的不匹配,是造成材料断裂韧性提高的主要原因;随着Al渗入量的增加,复合材料断口中金属撕裂棱及韧窝的比例增加.