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SYNTHESIS　OF　NANO－METER　TiAl　INTERMETALLIC　COMPOUND　THROUGH　mechanical　alloying

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Acta Metallurgica Sinica(English Letters) 1996年第6期9卷 585-588页

作者： M.Qi,L.S.Cui and D.Z.Yang(D Engineering, Dalian University of Technology, Dalian 116024, China ) Dalian Univ of Technology Dalian China

The transformation process of mixture of elemental Al and Ti powders during mechanical alloying was *** show that Al-Ti amorphous phase and then TiAl intermetallic compound *** TiAl intermetallic compound produced by ... 详细信息

关键词： TiAl intermetallic mechanical alloying

SYNTHESIS OF Ni-Mo ALLOYS BY mechanical alloying

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Acta Metallurgica Sinica(English Letters) 1993年第12期6卷 437-441页

作者： LIANG Guoxian WANG Erde HUO Wencan Harbin Institute of Technology,Harbin,China Post Box 435,Harbin Institute of Technology,Harbin 150006,China Harbin Inst of Technology Harbin China

Ni_(100-x)Mo_x(x=20,30,38)alloys have been synthesized by mechanical *** structure evolution of powders in mechanical alloying process has been monitored by X-ray diffraction,scanning electron microscopy and transmission electron microscopy *** results show that the Ni_(62)Mo_(38)sample becomes partially amorphous after high energy ball milling,while the Ni_(80)Mo_(20)and Ni_(70)Mo_(30)become non-equilibrium nanocrystals.

关键词： mechanical alloying Ni-Mo alloy amorphization nano-crystal

Microstructure and Properties of W-15Cu Alloys Prepared by mechanical alloying and Spark Plasma Sintering Process

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Journal of Wuhan University of Technology(Materials Science) 2008年第3期23卷 399-402页

作者：章桥新 School of mechanical and Electronic Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis&Processing Wuhan University of TechnologyWuhan 430070China

W-15Cu composite powders prepared by mechanical alloying （MA） of raw powders were consolidated by spark plasma sintering （SPS） process at temperature ranged 1 230-1 300 ℃ for 10 min and under a pressure of 30 MPa. By using high energy milling, particles containing very fine tungsten grains embedded in copper, called composite particles, could be produced. The W grains were homogeneously dispersed in copper phase, which was very important to obtain W-Cu alloy with high mechanical properties, fine and homogeneous microstructure. The microstructure and properties of W-15Cu alloys prepared by SPS processes at different temperature were researched. The results show that W-15Cu alloys consolidated by SPS can reach 99.6 % relative density, and transverse rupture strength （TRS） is 1 400.9 MPa, Rockwell C hardness （HRC） is 45.2, the thermal conductivity is 196 W/m-K at room temperature, the average grain size is less than 2 μm, and W-15Cu alloy with excellent properties, homogeneous and fine microstructure is obtained.

关键词： W-15Cu mechanical alloying spark plasma sintering (SPS)

Effects of mechanical alloying Parameters on the Microstructures of Nanocrystalline Cu-5 wt% Cr Alloy

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Journal of Wuhan University of Technology(Materials Science) 2013年第1期28卷 192-195页

作者：史昆玉薛丽红 YAN Youwei SHEN Tao State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology

Nanocrystalline Cu-5 wt%Cr alloy powders were fabricated by mechanical alloying （MA）, The effects of MA processing parameters on the crystallite size, solid solubility, and microstructures of the Cu- 5 wt%Cr alloys were investigated including type and size distribution of the grinding medium and ball-topowder weight ratio （BPR）. The results show that the crystallites were refined effectively and solid solubility of Cr in Cu was extended when heavier ball and higher BPR were adopted. The maximum solubility is extended up to 5.6 at% （namely 4.6 wt%） Cr in Cu by use of a combination of large and small size WC-Co balls with BPR of 30：1. A Cn-5 wt%Cr supersaturated solid solution alloy bulk is obtained by spark plasma sintering the as-milled powders at 900 ℃ for 5 min.

关键词： mechanical alloying Cu-Cr alloys nanocrystalline solid solubility

Formation and Sintering Behavior of Nanocrystalline Fe-Ni Powder by mechanical alloying

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Journal of Iron and Steel Research International 2003年第3期10卷 75-78页

作者： CHEN Wen-ge GU Chen-qing DING Bing-jun Xi'an University of Technology Xi'an Jiaotong University

The solid sintering behavior and mechanical properties of Fe-Ni powders prepared by mechanical alloying of elemental powders and hot pressing sintering in vacuum atmospheres were investigated. It was observed that the microstructure of the powder particles evolves in three stages. The alloy powder with average grain size of 20-30 nm was obtained. The sinter densification depends crucially on the particle rearrangement and the large amount of internal strain introduced during milling. The theoretical density of over 95 % was obtained after hot pressing sintering at 800 ℃ for 30 min with pressure of 50 MPa. No significant grain growth was observed during sintering. And also relatively high hardness was obtained.

关键词： mechanical alloying nanostructured material mechanical property hot pressing sintering

Effect of mechanical alloying on sinterability and phase evolution in pressure-less sintered TiB_(2)-TiC ceramics

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Journal of Materiomics 2019年第4期5卷 670-678页

作者： Tian-Yi Hu Mian-Yi Yao Dong-Li Hu Hui Gu Yu-Jin Wang Materials Genome Institute School of Materials Science and EngineeringShanghai UniversityShanghai200444China Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of Technology150080China Key Laboratory of Advanced Structure Function Integrated Materials and Green Manufacturing TechnologyMinistry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin150001China

Phase relation and microstructure evolution in the pressure-less sintered TiB_(2)‒TiC ceramics preceded with mechanical alloying were systematically studied by a combination of SEM *** debris from milling balls promotes sintering by dissolving into the TiC phase to achieve dense microstructures at 1600℃.Variation of W solution in TiC grains exposes two types of core-rim structures,with no or more W in dark and white cores respectively but with common medium W in both *** whitecores reveal an exchange reaction between WC and TiC via mechanical alloying to form the Ti_(1-z)W_(z)C phase prior to *** dark-cores inherit from the as-milled TiC power to further enable the reprecipitation of rims from a mixed liquid-phase,which facilitated also the anisotropic growth of TiB_(2) *** dark-cores grow persistently in the second-step at 2000℃ enabled by this liquid-phase,which coarsens the TiB2 grains *** more alloyed phase,sintering was insufficient at 1500℃ with only the surface fluidity from the primary powders,and the second-step sintering increased the fluidity in the liquid-phase to fully densify the binary ***-distribution of the alloyed W by two-step sintering rationalizes the evolution process of the binary microstructures and leads to better understanding of the mechanical behaviors.

关键词： TiB2‒TiC ceramics mechanical alloying Core‒rim structures Liquid-phase sintering Microstructure‒Property relationship

Microstructure and mechanical Properties of FeAl Intermetallics Prepared by mechanical alloying and Hot-Pressing

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Tsinghua Science and Technology 2009年第3期14卷 300-306页

作者：宋海霞吴运新唐传安袁帅巩前明梁吉 Department of mechanical Engineering Tsinghua UniversityBeijing 100084 China Department of mechanical Engineering Army Aviation Institute of PLABeijing 101123 China

FeAl intermetallics were prepared by mechanical alloying and vacuum hot-pressing. The Fe-48 at.% Al powder was ball-milled for 3-12 h, producing a solid solution structure of Fe （Al） with trace Al （Fe）. Subsequent vacuum annealing or hot-pressing introduced phase transformations into the FeAl （B2） intermetallics and Al2O3 inclusions. The hot-pressed FeAI intermetallics possess a high flexural strength of 831 MPa and a fairly good strain at break of 3.2%. The results show that the addition of 0.5 at.% B reduces the peak temperature for hot-pressing from 1180℃ to 1100℃, and increases the density of the compacts from 95% to 96.3%, but results in no significant improvement in the mechanical properties.

关键词： FeAl intermetallics mechanical alloying powder hot-pressing flexural strength

mechanical alloying of Ag-Cu Immiscible Alloy System

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Journal of Shanghai Jiaotong university(Science) 2006年第1期11卷 84-87页

作者：方芳何淼 National Key Lab. of Nano/Micro Fabrication Technology Key Lab.for Thin Film and Microfabrication of Ministry of Education Inst. of Micro and Nano Science and Technology Shanghai Jiaotong Univ.Shanghai 200030 China

mechanical alloying has been performed in Ag-Cu immiscible alloy system with five different compositions. X-ray diffraction analysis was carried out to determine the structural characterization of the milled powders. Lattice constants of the milled powders were determined and the solubility for Ag in Cu was calculated. The results demonstrated that MA indeed produced a face center cubic (f.c.c.). Cu-based Cu-Ag solid solution and the solid solubility has been extended to x(Ag)=30% for Ag in Cu when the grain size of Cu-based Cu-Ag solid solution is about 10 nm after MA. There is a three-phases co-existence during the process of MA in this alloy system which agrees well with other experimental and theoretical results. Based on the experimental results a formation model was proposed in this paper to understand the formation of Ag-Cu solid solution during MA.

关键词： mechanical alloying Ag-Cu immiscible alloy system solid solubility

Energy analysis of mechanical alloying of molybdenum disilicide in a new-type high energy vibrating ball mill

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Journal of China University of Mining and Technology 2008年第3期18卷 449-453页

作者： FENG Pei-zhong WANG Xiao-hong QIANG Ying-huai QU Xuan-hui School of Materials Science and Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221116 China School of Materials Science and Engineering University of Science ＆ Technology Beijing Beijing 100083 China

In order to understand the fundamentals of a high energy vibrating type milling process, the energy transfer during me-chanical alloying of molybdenum disilicide is investigated based on the Magini-Iasonna energy transfer method, amended by Murty. The efficiency factor and total energy of milling are calculated. MoSi2 synthesized by a mechanically induced self-propagating reaction has also been studied according to different milling parameters, such as the number of balls and the ball to powder weight ratio. The results indicate that the efficiency factor is between 1.944 and 8.507 J/(g·s). A total milling energy of about 19.38–26.47 kJ/g is found to be necessary for the mechanically induced self-propagating reaction of a Mo:2Si powder mixture. The efficiency of milling energy transfer is about 3.3%–4.5%. The experiment and modeling show that the optimum condition for mechanical alloy-ing is a half full vial of balls.

关键词： mechanical alloying high-energy ball mill energy analysis modeling