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

ＡＰＰＬＩＣＡＢＩＬＩＴＹＯＦＱＵＡＳＩＣＨＥＭＩＣＡＬＭＯＤＥＬＦＯＲＳＯＭＥＬＩＱＵＩＤＡＬＬＯＹＳＷＩＴＨＳＴＲＯＮＧＩＮＴＥＲＡＣＴＥＤＣＯＭＰＯＮＥＮＴＳ①ＬｉＪｉａｎｆｅｎｇ，ＤｅｎｇＨｏｎｇｍｅｉ，ＣｈｅｎＮｉａｎｙｉＳｈａｎｇｈａｉ...     

MICROSTRUCTURE AND DUCTILITY OF RE DOPED RAPIDLY SOLIDIFIED NiAl

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＤＵＣＴＩＬＩＴＹＯＦＲＥＤＯＰＥＤＲＡＰＩＤＬＹＳＯＬＩＤＩＦＩＥＤＮｉＡｌ￥ＳＵＮＢａｏｄｅ;ＬＩＮＤｏｎｇｌｉａｎｇ;ＹＡＮＧＧｅｎｃａｎｇ;ＺＨＯＵＹａｏｈｅ１）ＳｈａｎｇｈａｉＪｉａｏＴｏｎｇＵｎｉｖｅｒｓ...     

SUPERPLASTICITY IN LARGE-GRAINED Fe_3Al ALLOYS

ＳＵＰＥＲＰＬＡＳＴＩＣＩＴＹＩＮＬＡＲＧＥ－ＧＲＡＩＮＥＤＦｅ_３ＡｌＡＬＬＯＹＳＬＩＮＤｏｎｇｌｉａｎｇ（Ｔ．Ｌ．Ｌｉｎ），（ＳＨＡＮＡｉｄａｎｇ，ＣＨＥＮＭｉｎｇｗｅｉＳｈａｎｇｈａｉＪｉａｏｔｏｎｇＵｎｉｖｅｒｓｉｔｙ，Ｓｈａｎｇｈａｉ２００?..     

FORMABILITY OF TERNARY INTERMEDIATE COMPOUNDS IN SOME MOLTEN SALT PHASE DIAGRAMS

ＦＯＲＭＡＢＩＬＩＴＹＯＦＴＥＲＮＡＲＹＩＮＴＥＲＭＥＤＩＡＴＥＣＯＭＰＯＵＮＤＳＩＮＳＯＭＥＭＯＬＴＥＮＳＡＬＴＰＨＡＳＥＤＩＡＧＲＡＭＳ￥Ｋａｎｇ，Ｄｅｓｈａｎ；Ｗａｎｇ，Ｘｕｅｙｅ；Ｙａｏ，Ｓｈｕｗｅｎ；Ｃｈｅｎ，Ｎｉａｎｙｉ（Ｓｈａｎｇｈａｉ...     

TEMPERING RESPONSE OF A DEFORMED LOW CARBON DUAL PHASE STRUCTURE

ＴＥＭＰＥＲＩＮＧＲＥＳＰＯＮＳＥＯＦＡＤＥＦＯＲＭＥＤＬＯＷＣＡＲＢＯＮＤＵＡＬＰＨＡＳＥＳＴＲＵＣＴＵＲＥ￥ＪＩＮＭａｎ;ＪＩＡＮＧＺｈｏｎｇｈａｏ;ＮＡＮＳｈｅｎｇｈｕｉ;ＨＵＪｉａｎｄｏｎｇ;ＬＩＡＮｊｉａｎｓｈｅ（ＪｉｌｉｎＵｎｉｖｅｒｓｉ...     

THERMAL DECOMPOSITION OF ZINC CARBONATE HYDROXIDE HYDRATE POWDERS OF DIFFERENT PARTICLE SIZE AND SAMPLE MASS

ＴＨＥＲＭＡＬＤＥＣＯＭＰＯＳＩＴＩＯＮＯＦＺＩＮＣＣＡＲＢＯＮＡＴＥＨＹＤＲＯＸＩＤＥＨＹＤＲＡＴＥＰＯＷＤＥＲＳＯＦＤＩＦＦＥＲＥＮＴＰＡＲＴＩＣＬＥＳＩＺＥＡＮＤＳＡＭＰＬＥＭＡＳＳ①ＣｈｅｎＪｉａｎｘｕｎ,ＺｈａｏＲｕｉｒｏｎｇａｎｄＪｉａｎ...     

MICROSTRUCTURE AND PROPERTIES OF TiCp/Al COMPOSITE FABRICATED BY CONTACT REACTION METHOD AND SEMISOLID EXTRUSION

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＰＲＯＰＥＲＴＩＥＳＯＦＴｉＣｐ／ＡｌＣＯＭＰＯＳＩＴＥＦＡＢＲＩＣＡＴＥＤＢＹＣＯＮＴＡＣＴＲＥＡＣＴＩＯＮＭＥＴＨＯＤＡＮＤＳＥＭＩＳＯＬＩＤＥＸＴＲＵＳＩＯＮ①ＬｕｏＳｈｏｕｊｉｎｇ，ＳｕｎＪｉａｋｕａｎＳｃｈ...     

EROSION WEAR OF AlSi-GRAPHITE AND Ni/GRAPHITE ABRADABLE SEAL COATINGS

ＥＲＯＳＩＯＮＷＥＡＲＯＦＡｌＳｉＧＲＡＰＨＩＴＥＡＮＤＮｉ／ＧＲＡＰＨＩＴＥＡＢＲＡＤＡＢＬＥＳＥＡＬＣＯＡＴＩＮＧＳ①ＹｉＭａｏｚｈｏｎｇ，ＺｈａｎｇＸｉａｎｌｏｎｇ，ＪｉＧｅｎｇｓｈｕｎ，ＺｈｅｎｇＪｉｈｏｎｇ，ＨｅＪｉａｗｅｎＳｔａｔｅＫ...     

CAUSE OF FORMATION OF NODULAR COPPER PARTICLES ON ELECTROREFINED COPPER SUBSTRATE

ＣＡＵＳＥＯＦＦＯＲＭＡＴＩＯＮＯＦＮＯＤＵＬＡＲＣＯＰＰＥＲＰＡＲＴＩＣＬＥＳＯＮＥＬＥＣＴＲＯＲＥＦＩＮＥＤＣＯＰＰＥＲＳＵＢＳＴＲＡＴＥ￥Ｌｉｎ，Ｊｉａｎｘｉｎ；Ｌｉ，Ｘｕｅｌｉａｎｇ；Ｃｈｅｎ，Ｈａｎｈｅ；Ｈｅ，Ｊｉａｎｂｏ（ＨｅｆｅｉＰｏｌ...     

MICROSTRUCTURAL FEATURES OF RS Al-BASED THERMAL-STRENGTHENED ALLOYS

ＭＩＣＲＯＳＴＲＵＣＴＵＲＡＬＦＥＡＴＵＲＥＳＯＦＲＳＡｌＢＡＳＥＤＴＨＥＲＭＡＬＳＴＲＥＮＧＴＨＥＮＥＤＡＬＬＯＹＳ①ＷａｎｇＪｉａｎｑｉａｎｇ，ＧｅｎｇＰｉｎｇ，ＺｈａｎｇＢａｏｊｉｎ，ＺｅｎｇＭｅｉｇｕａｎｇＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅ...     

Mg,Ca,Y,La和Ce在Ni3Al中的合金化行为

利用Ｘ射线衍射法确定了合金元素Ｍｇ，Ｃａ，Ｙ，Ｌａ及Ｃｅ在Ｎｉ３Ａｌ中的合金化行为。结果表明，Ｍｇ，Ｃａ，Ｙ，Ｌａ及Ｃｅ原子占据Ｎｉ３Ａｌ中的Ａｌ位，并按以下顺序增加Ｎｉ３Ａｌ的有序度：Ｍｇ，Ｃａ，Ｙ和Ｌａ－Ｃｅ。随着合金元素含量的增加，Ｎｉ３Ａｌ的点阵常数亦按Ｍｇ，Ｃａ，Ｙ，Ｌａ－Ｃｅ的顺序呈线性增大。     

First-principles study of the influence of lattice misfit on the segregation behaviors of hydrogen and boron in the Ni–Ni3Al system

A first-principles method is employed to investigate the segregation behaviors of hydrogen and boron in Ni-based and Ni₃Al-based alloys using two models. Chemical binding energy analysis shows that both boron and hydrogen are able to segregate to the interstices in the Ni phase, Ni₃Al phase and Ni/Ni₃Al interface. Boron, however, is bound to its neighbor atoms more tightly than hydrogen in both models and its stable state exists over a broader lattice misfit range compared with hydrogen. The bond order analysis we have proposed reveals the origin of the boron-induced ductility and hydrogen-induced embrittlment at the Ni/Ni₃Al interface with different lattice misfit. The calculations indicate that hydrogen causes more severe embrittlement at the Ni/Ni₃Al interface in Ni₃Al-based than in Ni-based alloys. Furthermore, it is found that the boron-induced ductility and hydrogen-induced embrittlement are changed, and thus controllable, by the lattice misfit. Our results provide a quantitative explanation of many experimental phenomena caused by the addition of boron and hydrogen to Ni-based and Ni₃Al-based alloys.     

High strength nanocrystalline L12-Al3(Ti,Zr) intermetallic synthesized by mechanical alloying

Nanocrystalline L1₂-Al₃(Ti,Zr) intermetallic has been synthesized directly by mechanical alloying of elemental blends of the nominal composition Al₇₅(Ti_25−xZr_x) for x = 0, 5, 10, 15, 20 and 25. The long range order parameter is found to increase with the Zr content. The lattice parameter difference between the L1₂-Al₃(Ti,Zr) and Al was minimum for the alloy with 10% Zr. A very high hardness of 3.23 GPa was achieved for the L1₂ phase in the Al₇₅Ti₁₅Zr₁₀ composition in the green compact condition with a relative density of 77.6%.     

EFFECT OF Ti-ADDITION ON MECHANICAL ALLOYING OF NiAl

Mechanical alloying(MA)of Ni_(50)Ai_(45)Ti_5(atomic per cent)is studied by.situ thermalanalyses,XRD.and metallography.The results showed that the alloying process ofNi_(50)Al_(45)Ti_5 is similar to that of Ni_(500Al_(50).The addition of 5 at.%Ti prolongs the millingtime of alloy prior to the explosive reaction in the alloy.The final product.is nanocrystallineβ-phase NiAl(Ti)(B2 structure ).The addition of 5 at.% Ti shows little effect on the lattice parameter of β-phase.     

代位合金元素对Fe3Al金属间化合物结构与塑性的影响

研究了Ｃｒ、Ｍｏ、Ｔｉ、Ｎｉ、Ｍｎ、Ｓｉ等代位合金元素对当量成分、ＤＯ３结构等轴晶Ｆｅ３Ａｌ合金真空拉伸性能、ＤＯ３转变温度Ｔｃ、ＤＯ３有序度、位错反相畴、位错组态等的影响，从合金元素原子在Ｆｅ３Ａｌ单胞亚点阵占位、原子解离能、反相畴界能等方面进行了初步探讨。结果表明，与Ｆｅ３Ａｌ相比，Ｃｒ的添加降低合金的Ｔｃ温度、提高真空拉伸延伸率，与ＣｒＡｌ原子对交互作用能、反相畴界能的降低有关；其它三元合金都表现高的Ｔｃ温度与低的塑性     

Influence of process control agents on the performance of Ni3Al by mechanical alloying

The influence of process control agents (PCAs) on the mechanical properties of Ni3Al intermetallic compounds by mechanical alloying was in- vestigated in order to develop oxide deposition reinforced intermetallics. The PCAs in mechanical alloying were pure ligroin, 75 vol.% ligroin 25 vol.% alcohol, 50 vol.% ligroin 50 vol.% alcohol, 25 vol.% ligroin 75 vol.% alcohol, and pure alcohol. The normal composition is Ni-22.9at.%Al-0.5at.%B, the ball-to-powder weight ratio is 10:1, and the milling time is 30 min. Then, the powders were sintered by spark plasma sintering under 40 MPa for 5 min at 1000°C. The results show that a higher bending strength and a higher hardness were obtained when the PCAs were 75% ligroin 25% alcohol in mechanical alloying. The bending strength is about 2700 MPa and the hardness (HV) is more than 6 GPa.     

Ni75MnxAl25-x合金早期沉淀相的微观相场模拟

采用三元微观相场动力学模型研究Ni75MnxAl25-x合金早期沉淀相的形成过程。对合金微观组织演化图像、有序相体积分数曲线、序参数曲线及占位几率的分析表明:该合金首先析出L10结构,随后L10结构向L12结构转变,L12结构在L10结构的内部析出。随着Al浓度的增大,等成分有序化阶段缩短;且L10结构体积分数增大,发生结构转变的时间提前。Al和Mn原子在(001)和(002)面几乎同时有序排列,但是一定时间后(002)面原子开始贫化,发生结构转变,Al原子主要占据β位,Mn原子主要占据αⅡ位。合金最终析出单一的L12伪二元结构。     

Ni_3Al有序金属间化合物的主要特性和应用

Ni_3Al有序金属间化合物由于在高温下具有优异的强度和抗氧化能力而越来越受关注。Ni_3Al金属间化合物的晶体结构为L1_2,是面心立方的有序衍生结构。Ni_3Al具有屈服强度对温度的反常关系。采用硼微合金化能有效减低材料的本征脆性和高温水气环境中的氢脆。应用6%～9%Cr合金化能减轻材料的中温脆性。,它可以应用粉末冶金、铸造和锻压方法进行工业生产。     

L12相间有序畴界成分的微观相场研究

利用微观相场模型研究了有序畴界结构、合金成分和弹性应变能对Ni75AlxV25-x合金中L12-Ni3Al相间有序畴界成分的影响规律。结果表明:L12相间形成的3种有序畴界中,在(100)//(200)·[001]处,Ni的贫化程度最小,Al的贫化程度最大,V的偏聚程度最大;在(200)//(200)处,Ni的贫化程度最大,Al的贫化程度最小,V的偏聚程度最小。随着合金中Al浓度的增加,3种有序畴界处Ni的浓度降低,Al的浓度升高,V的浓度降低。弹性应变能使得L12相间3种有序畴界处Ni和Al的浓度升高,V浓度降低。但弹性应变能对(200)//(200)·[001]和(100)//(200)·[001]成分的影响较大,对(200)//(200)成分的影响则相对较小。     

用机械合金化方法制备Ni-Al系金属间化合物

用球磨机分别对Ｎｉ－５０ａｔ．－％Ａｌ和Ｎｉ－２５ａｔ．－％Ａｌ混合粉末进行机械合金化，并对Ｎｉ_３Ａｌ预合金粉末进行高能球磨，观察了粉末的金相组织，测定了粉末的硬度、平均直径和晶粒尺寸，并作了ＸＲＤ物相分析结果表明，经３ｈ研磨，Ｎｉ－５０ａｔ．－％Ａｌ混合粉末变成ＮｉＡｌ金属间化合物，其晶粒直径约５ｎｍ；经５ｈ机械球磨，Ｎｉ－２５ａｔ．－％Ａｌ混合粉末成为无序的亚稳定Ｎｉ固溶体，而Ｎｉ_３Ａｌ预合金粉末由Ｌｌ_２型长程有序金属间化合物转变为ｆｃｃ无序固溶体；球磨更长时间，则形成纳米晶．