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SYNTHESIS OF INTERMETALLICS BY MECHANICAL ALLOYING

F. H.(Sam) Froes , C. Suryanarayana , and D. Mukhopadhyay (Institute for Materials and Advanced Processes (IMAP) , University of Idaho , Moscow , ID 83844-3026 , USA)C-G. Li(BlM , P.O. Box 81 , Beijing , 100095 , P.R. CHINA)K. Brand(On leave from Institut fur Werkstoffwissenshaft , Technische Universitst Dresden , 07062 Dresden , Germany , at IMAP)

金属学报(英文版)

Mechanical alloying (MA), a solid-state powder processing method, is a "far from equilibrium" synthesis technique which allows development of novel crystal structures and microstructures, leading to enhanced physical and mechanical properties. The ability to synthesize a variety of alloy phases including supersaturated solid solutions, nanocrystalline structures, amorphous phases and intermetallic compounds themselves is discussed. No extension of solubility using MA has been observed in the intermetallics studied. Nanostructured grains were observed in all compositions. Long time milling generally resulted in amorphous phase formation in large part because of the increase in grain boundary energy/mole with reduced grain size; good agreement with the Miedema model for amorphization was obtained in the Al-Fe system. Generally an anneal was required to form the intermetallic after MA; however,intermetallics with a large negative enthalpy of formation were detected in the MA condition. A study of the hot isostatic pressing of γ-TiAl powders produced by MA demonstrated that full density can be achieved at least 400℃ below the normal temperature required for conventional powder, that is 725℃ or below. Nanometered sized grains (≤100nm)were observed after HIP'ing up to 850℃.

关键词: : Intermetallics , null , null

CONSOLIDATION BEHAVIOR OF MECHANICALLY ALLOYED γ-TiAl

LI Chenggong , YANG Wanhong , LUO Zhiping(Institute of Aeronautical Materials , Beijing 100095 , China FROES F H , FREFER A) Institute of Materials and Advanced Processing , College of Mines , University of Idaho , Moscow. ID83843-3026. USA

金属学报(英文版)

Use of mechanically alloying for preparation of Ti-35at.%Al results in significant reduction in crystal size, so the ductility of alloy can be improved Consolidation of Mechanically alloyed γ -TiAl is difficult because of its poor workability. The present paper will discuss recent studies on consolidation behavior by using different methods, such as explosive compaction, hot isostatic pressing, and rapid omnidirectional compaction, etc.. The microstructure and property of the samples are evaluated.

关键词: : mechanical alloying , null , null , null

Titanium Aluminides: Science, Technology, Applications and Synthesis by Mechanical Alloying

F.H.Froes (Institute for Materials and Advanced Processes (IMAP) , College of Mines and Earth Resources , University of Idaho , Moscow , Idaho 83843-4195 , USA)

材料科学技术（英文）

The production. characteristics. and commercialization of monolithic and composite titanium aluminides are summanzed with emphasis on use in the demanding aerospace industry. The attractive elevated temperature properties combined with alow density make these materials of great interest, but inherently low "forgiveness", and environmental concerns, must be overcome before widespread use will occur One synthesis method for the production of monolithic titanium aluminides-mechanical alloying- will be discussed in detail

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ADVANCED SYNTHESIS OF LIGHT METALS

F.H. Froes(IMAP , University of Idaho , Moscow , ID 838443026 , USA Manuscript received 26 August 1996)

金属学报(英文版)

The synthesis, processing and mechanical properties of the light metals, aluminum,magnesium and titanium Produced by advanced techniques are reviewed. Synthesis techniques to be addressed will include rapid solidification, spray deposition, mechanical alloying, plasma Processing and vapor deposition.

关键词: :synthesis/processing , null , null , null , null , null , null , null , null , null , null

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