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首頁> 外文學(xué)位 >Pore metamorphosis during liquid phase sintering in microgravity.
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Pore metamorphosis during liquid phase sintering in microgravity.

機(jī)譯：微重力液相燒結(jié)過程中的孔變質(zhì)。

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摘要

This dissertation documents the pore metamorphosis in microgravity liquid phase sintered Co-Cu and Fe-Cu samples that have been successfully conducted on several sounding rocket flights, Space Shuttle missions and aboard the Mir Station. Pore filling and coarsening were found in most samples while pore breakup was also found in low liquid volume samples. Pores showed bifurcated behaviors based on their liquid volume fractions. These behaviors resulted from particle rearrangement, particle growth and volume diffusion that associated with interfacial energy differences, instabilities, and grain coarsening along the interface between phases. The mechanisms for pore breakup, pore coarsening and pore filling are discussed. An initiation mechanism induced by grain growth, capillary force and other weak forces is proposed and the results from theoretical analysis and CFD numerical simulation for pore breakup are presented. The microstructure evolutions of Co-Cu and Fe-Cu samples and the grain growth measurements that associated with pore morphological changes are also documented in this dissertation.
機(jī)譯：這篇論文記錄了微重力液相燒結(jié)Co-Cu和Fe-Cu樣品中的孔變質(zhì)，這些樣品已在多次探空火箭飛行，航天飛機(jī)飛行任務(wù)和“和平號”站上成功進(jìn)行。在大多數(shù)樣品中發(fā)現(xiàn)孔填充和粗化，而在低液體量樣品中也發(fā)現(xiàn)孔破裂。毛孔根據(jù)其液體體積分?jǐn)?shù)顯示出分叉的行為。這些行為是由于粒子重排，粒子生長和體積擴(kuò)散而引起的，這些粒子重排與界面能差，不穩(wěn)定性和沿相間界面的晶粒粗化有關(guān)。討論了孔破裂，孔粗化和孔填充的機(jī)理。提出了由晶粒長大，毛細(xì)作用力和其他弱作用力引起的起爆機(jī)理，并給出了孔隙破裂的理論分析和CFD數(shù)值模擬的結(jié)果。本文還記錄了Co-Cu和Fe-Cu樣品的微觀結(jié)構(gòu)演變以及與孔形態(tài)變化有關(guān)的晶粒長大測量結(jié)果。

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  • 作者

    He, Yubin.;

  • 作者單位

    The University of Alabama in Huntsville.;

  • 授予單位 The University of Alabama in Huntsville.;
  • 學(xué)科 Engineering Metallurgy.; Engineering Materials Science.
  • 學(xué)位 Ph.D.
  • 年度 2001
  • 頁碼 196 p.
  • 總頁數(shù) 196
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 冶金工業(yè);工程材料學(xué);
  • 關(guān)鍵詞

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