應用介觀反應動力學探討鋰鋁合金超塑性成形擴散接合製程問題（I）

Mesomechanics Study on Reaction Kinetics of Li-Al Alloys in SPF-DB Processing (I)

歐陽又新(Yew-Shing Ouyang)

《鍛造》 18卷4期 (2009/12) Pp. 8-14

https://doi.org/10.29791/Forging.200912.0002

摘要

在太空工業肇始的1950－1960年代，鋰鋁合金即是國際策略金屬開發之重點。但由於鋰與鋁本身之氧化活性不易掌握等因素使此一具有比質量強度較鋁合金高之航太材料的量產尤其是加工熱處理後之質量穩定性問題到1980年間仍未能完全決；配方與冶金開發策略多元化難以掌控。介觀力學是筆者從技術面，循設計方法論，從一般尺度探討宏觀力學體系取向問題之基礎設計理論。本文基於介觀力學理論，試從微米-奈米尺度間著眼，回顧並探究鋰鋁合金成形及擴散接合機理研究成果，特別先從材料熱物理與電化學之反應動力檢視文獻報導與論證疵誤之所在。目的在為精微製程與創新產品開發探求有前瞻性之核心技術手段。

並列摘要

Lithum aluminum alloys was an international strategic material, which has subjected to keen development, since the inception of the space age in 1950-1960. However, active oxidation and structural stability and reliability problems have rendered this high specific strength aircraft materials hard to be accommodated in mass production up to 1980s in which post heat treatment is a bottle neck. Therefore, its composition and metallurgical processes are diversified. Mesomechanics is a theory proposed by current author to account such problems. It follows design methodology in probing macro mechanics characteristics for the objective of exploiting effective solution to complicated precision processing problems guided by unified scales analysis. On this premises, current paper offers critical review and elaboration on diffusion mechanisms of Li-Al alloys. Special attention is placed on thermal-physical and electro-chemistry aspects of reaction kinetics. Through this effort, precision micro processing and innovative product development may be supported by the mainstay of core technologies.