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镍基高温合金HIP扩散连接的组织和性能

闫来成 , 燕平 , 赵京晨

钢铁研究学报

采用热等静压扩散连接工艺，获得了DD402单晶合金与FGH95合金的扩散偶。研究了热等静压温度对扩散偶的持久性能、组织结构的影响。结果表明，不同温度热等静压的扩散偶均实现了冶金结合；结合界面区形成了一个组织过渡区，DD402单晶合金中的γ′ 相粒子在HIP过程中发生了筏形化；热处理后结合界面区的γ′ 相形貌和尺寸未发生明显变化。1166℃热等静压扩散偶的650℃持久性能偏低，断口在DD402单晶合金侧，断裂面从结合界面区的大尺寸γ′ 相起始，沿{111}滑移面向筏形γ′ 相区扩展。

关键词: 镍基高温合金 , diffusion bonding , microstructure , property , hot isostatic pressing

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

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

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