APPLICABILITY OF QUASICHEMICAL MODEL FOR SOME LIQUID ALLOYS WITH STRONG-INTERACTED COMPONENTS

ＡＰＰＬＩＣＡＢＩＬＩＴＹＯＦＱＵＡＳＩＣＨＥＭＩＣＡＬＭＯＤＥＬＦＯＲＳＯＭＥＬＩＱＵＩＤＡＬＬＯＹＳＷＩＴＨＳＴＲＯＮＧＩＮＴＥＲＡＣＴＥＤＣＯＭＰＯＮＥＮＴＳ①ＬｉＪｉａｎｆｅｎｇ，ＤｅｎｇＨｏｎｇｍｅｉ，ＣｈｅｎＮｉａｎｙｉＳｈａｎｇｈａｉ...     

EFFECT OF PROGRESSIVE AGING TREATMENT ON THE PROPERTIES AND MICROSTRUCTUR

ＥＦＦＥＣＴＯＦＰＲＯＧＲＥＳＳＩＶＥＡＧＩＮＧＴＲＥＡＴＭＥＮＴＯＮＯＮＴＨＥＰＲＯＰＥＲＴＩＥＳＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＯＦＴＨＥＨＩＧＨ－ＨＡＲＤＥＬＡＳＴＩＣＮＩＣＫＥＬ－ＣＨＲＯＭＩＵＭ－ＡＬＵＭＩＮＩＵＭＡＬＬＯＹ￥ＬＩＵＧｕｉ...     

APPLICATION RESEARCH ON THE Ni _3 Al INTERMETALLIC COMPOUND IN CISRI

ＡＰＰＬＩＣＡＴＩＯＮＲＥＳＥＡＲＣＨＯＮＴＨＥＮｉ_３ＡｌＩＮＴＥＲＭＥＴＡＬＬＩＣＣＯＭＰＯＵＮＤＩＮＣＩＳＲＩＦＥＮＧＤｉ；ＹＥＷｕｊｕｎ；ＨＡＮＧｕａｎｇｗｅｉ；ＬＵＯＨｅｌｉ（ＣｅｎｔｒａｌＩｒｏｎＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔ?..     

SOLIDIFICATION AND MICROSEGREGATION BEHAVIORS OF NICKEL-BASE SINGLE CRYSTAL SUPERALLOY SOLIDIFIED AT MEDIUM COOLING RATE

ＳＯＬＩＤＩＦＩＣＡＴＩＯＮＡＮＤＭＩＣＲＯＳＥＧＲＥＧＡＴＩＯＮＢＥＨＡＶＩＯＲＳＯＦＮＩＣＫＥＬＢＡＳＥＳＩＮＧＬＥＣＲＹＳＴＡＬＳＵＰＥＲＡＬＬＯＹＳＯＬＩＤＩＦＩＥＤＡＴＭＥＤＩＵＭＣＯＯＬＩＮＧＲＡＴＥ①ＤｕＷｅｉ,ＬｉＪｉａｎｇｕｏａｎ...     

NUMERICAL SIMULATION OF ALTERNATIVE HORIZONTAL LEVITATION ELECTROMAGNETIC CONTINUOUS CASTING（Ⅱ）

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＡＬＴＥＲＮＡＴＩＶＥＨＯＲＩＺＯＮＴＡＬＬＥＶＩＴＡＴＩＯＮＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＣＯＮＴＩＮＵＯＵＳＣＡＳＴＩＮＧ（Ⅱ）￥ＺｈｕＳｈｏｕｊｕｎ；ＲｅｎＺｈｏｎｇｍｉｎｇ；ＤｅｎｇＫａｎｇ；Ｊｉａｎ...     

EFFECT OF P，S AND Si ON THE SOLIDIFICATION，SEGREGATION，MICROSTRUCTURE AND MECHANICAL PROPERTIES IN Fe－Ni BASE SUPERALLOYS

ＥＦＦＥＣＴＯＦＰ,ＳＡＮＤＳｉＯＮＴＨＥＳＯＬＩＤＩＦＩＣＡＴＩＯＮ,ＳＥＧＲＥＧＡＴＩＯＮ,ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＩＮＦｅ－ＮｉＢＡＳＥＳＵＰＥＲＡＬＬＯＹＳＺ．Ｑ．Ｈｕ;Ｗ．Ｒ．ＳｕｎａｎｄＳ...     

SUBSTITUTION BEHAVIOR OF ALLOYING ELEMENTS IN INTERMETALLIC COMPOUND，TiAl

ＳＵＢＳＴＩＴＵＴＩＯＮＢＥＨＡＶＩＯＲＯＦＡＬＬＯＹＩＮＧＥＬＥＭＥＮＴＳＩＮＩＮＴＥＲＭＥＴＡＬＬＩＣＣＯＭＰＯＵＮＤ，ＴｉＡｌＸＵＤｏｎｇｓｈｅｎｇ；ＳＯＮＧＹａｎ；ＬＩＤｏｎｇ；ＨＵＺｈｕａｎｇｑｉ（ＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌＲｅｓｅａ...     

DEFORMATION AND FRACTURE MECHANISMS OF TWO－PHASE TiAl－BASED ALLOYS WITH FULLY LAMELLAR MICROSTRUCTURE

ＤＥＦＯＲＭＡＴＩＯＮＡＮＤＦＲＡＣＴＵＲＥＭＥＣＨＡＮＩＳＭＳＯＦＴＷＯ－ＰＨＡＳＥＴｉＡｌ－ＢＡＳＥＤＡＬＬＯＹＳＷＩＴＨＦＵＬＬＹＬＡＭＥＬＬＡＲＭＩＣＲＯＳＴＲＵＣＴＵＲＥＹ．Ｇ．Ｚｈａｎｇ，Ｃ．Ｑ．Ｃｈｅｎ（ＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔ...     

EFFECT OF HOMOGENIZATION TREATMENT UNDER AN ELECTRIC FIELD ON T_1 DISTRIBUTION AND MECHANICAL PROPERTIES OF 2091 Al－Li ALLOY

ＥＦＦＥＣＴＯＦＨＯＭＯＧＥＮＩＺＡＴＩＯＮＴＲＥＡＴＭＥＮＴＵＮＤＥＲＡＮＥＬＥＣＴＲＩＣＦＩＥＬＤＯＮＴ_１ＤＩＳＴＲＩＢＵＴＩＯＮＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦ２０９１Ａｌ－ＬｉＡＬＬＯＹ￥ＬＩＵＷｅｉ;ＣＵＩＪｉａｎｚｈｏ?..     

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF (Nb, Ti)C NICKEL BASE SUPERALLOY

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦ（Ｎｂ,Ｔｉ）ＣＮＩＣＫＥＬＢＡＳＥＳＵＰＥＲＡＬＬＯＹ①ＣａｉＫｅｆｅｎｇ,ＮａｎＣｅｗｅｎａｎｄＭｉｎＸｉｎｍｉｎＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏｆＡｄｖａｎｃ...     

TiAl合金激光气体合金化

本文利用激光气体合金技术对ＴｉＡｌ合金进行表面改性，制得了以ＴｉＮ为增强相的新型快速凝固“原位”耐磨复合材料表面改性层，激光表面改性层显微组织受激光处理工艺参数的控制，试验结果表明，激光气体合化是一种提高ＴｉＡｌ合金耐磨性的表面改性新技术。     

Development of a nanostructured Zr3Co intermetallic getter powder with enhanced pumping characteristics

Nanostructured Zr₃Co intermetallic powders were produced by mechanical alloying (MA) of the elemental Zr and Co powders. The phase evolution, microstructural characteristics and formation mechanism of Zr₃Co powders during mechanical alloying were studied by means of X-ray diffraction method, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM). The results showed that after an optimum mechanical alloying time and optimum heat treatment, nanostructured Zr₃Co intermetallic powder was achieved. It was found that Zr₃Co intermetallic compound is formed by the diffusion of Cobalt into Zirconium during mechanical alloying. In the second stage, after an optimum heat treatment, formation and growth of Zr₃Co intermetallic compound are controlled by interdiffusion of Co and Zr. Moreover, our results indicated that the synthesized nanostructured Zr₃Co intermetallic powders show enhanced pumping properties and gas sorption response in contrast to the bulk, thin film and commercial getters.     

NiAl金属间化合物的研究概述

综述了NiAl金属间化合物的力学性能、合金化以及提高强韧性的方法,并对NiAl合金的制备方法作了介绍,特别是利用电热爆炸超高速定向喷涂技术可原位生成亚微米晶NiAl金属间化合物及金属间化合物复合涂层.     

Synthesis of nanocrystalline NiAl by mechanical alloying

The nanocrystalline NiAl intermetallic compound was synthesized by mechanical alloying of the elemental powders. The structural changes of powder particles during mechanical alloying were studied by X-ray diffractometery, scanning electron microscopy and microhardness measurements. The mechanical alloying resulted in the gradual formation of nanocrystalline NiAl with a grain size of 20 nm. It was found that NiAl phase develops by continuous diffusive reaction at Ni/Al layers interfaces. The NiAl compound exhibited high microhardness value of about 1035 Hv.     

TiAl金属间化合物与NiCr20TiAl摩擦焊接性分析

采用SN比设计方法优化了TiAl金属间化合物与NiCr20TiAl摩擦焊接的工艺规范，分析了接头组织变化规律，研究了TiAl全属间化合物摩擦焊接成形控制特点。     

Modelling of defects and amorphisation by ball milling of γ-TiAl

The formation and site preference energies and volume changes of single and pair of defects of ternary alloying elements in γ-TiAl intermetallic compound were studied by the density functional theory. Slight tendency to clusterization of antisite defects has been found. This may lead to disorder in the system. The V and Cr atoms prefer to reside in the Ti sublattice. The formation energy for Cr–Cr, Cr–V and V–V nearest neighbour pairs are in the 1.3–2 eV range. The Al antisite in Ti sublattice requires much less energy than the Ti antisite in Al sublattice. The amorphisation process of TiAl alloy was studied by means of high energy ball milling of Ti and Al elemental powders, which produces amorphous structure after 40 h. The amorphous states were studied by the DFT calculations of many random atomic configurations and the results were compared with the NiAl compound. Possible explanation for the amorphisation of the TiAl compound is presented.     

Mechanical alloying of dispersion-hardened Ni3Al-B from elemental powder mixtures

Mechanical alloying and hot extrusion were studied as a means to dispersion harden an intermetallic compound based on Ni ₃ Al- B from elemental powder mixture. The oxide used for the dispersoids was partially stabilized zirconia. During mechanical alloying the microstructure evolved according to the characteristic stages found in other mechanical alloying systems. Completion of the alloying reaction required 16 h, beyond which loss of the crystalline property set in. Experimental observation of the grain refinement during mechanical alloying agreed with a prediction based on an existing model. Compared to V- cone mixing, the mechanical alloying produced a homogeneous distribution of fine dispersoids. The refined grain structure and dispersoids resulted in a high tensile yield strength over a wide range of temperatures.     

细晶TiAl基合金的制备及高温氧化行为

采用机械合金化及放电等离子烧结方法制备超细晶/纳米晶TiAl基合金,并利用差热分析仪进行循环高温氧化试验,研究粉末机械合金化对烧结细晶粒TiAl基合金组织及高温氧化性能的影响。结果表明,球磨是获得细晶粒组织的原因,粉末经球磨及放电等离子烧结后,形成了细小、球状的TiAl和Ti3Al相组织;该细晶粒组织在高温循环氧化条件下显示出较高的抗氧化性,且随Nb量增加抗氧化性得到提高,升温阶段的氧化速率最快。     

添加W对高铌TiAl合金组织和力学性能的影响

研究了添加W（0．2原子分数,％）对高铌TiAl合金组织和力学性能的影响。试验结果表明,W合金化能改变高铌TiAl合金的铸态组织,但不能改变热加工组织以及4种典型组织和温度对其力学性能的影响。W合金化能提高高铌TiAl合金的室温及高温强度、降低强度随温度下降的速率 、提高脆韧转变温度,但对室温塑性影响不大,有利于FAM组织在更高温度下使用。     

过饱和固溶NiAl合金的机械合金化合成机理研究

采用机械合金化方法,以Ni、Al元素粉末为原料,对四种成分的NixAl100-x(x=25,30,40,50)进行不同球磨时间和球磨转速的机械合金化合成;并对Ni30Al70的合成产物进行热处理.研究了过饱和固溶NiAl的机械合金化合成机理.研究表明:NixAl100-x四种成分的元素粉末通过机械合金化方法均制备出纳米晶NiAl金属间化合物粉末;非化学计量配比成分的Ni-Al粉末通过机械合金化合成NiAl过饱和同溶合金,其机械合金化合成机理为含有以原子扩散为基础的强制同溶的燃烧合成反应.