在加熱保溫過程中顯微組織的演變規(guī)律
(北京有色金屬研究總院
有色金屬材料制備加工國家重點實驗室, 北京 100088)
摘 要: 利用噴射成形技術(shù)制備了70Si30Al合金新型電子封裝材料， 研究了沉積態(tài)合金的顯微組織及其隨溫度變化的規(guī)律。結(jié)果表明： 沉積態(tài)70Si30Al合金顯微組織細小， 初生硅相為不規(guī)則的塊狀， 均勻彌散分布， 初生硅相之間主要是過飽和α（Al）相和鋁硅偽共晶相； 70Si30Al合金在620 ℃以下保溫90 min， 初生硅相沒有明顯長大， 但隨著溫度的升高出現(xiàn)球化現(xiàn)象， 過飽和α（Al）相沒有顯著變化， 鋁硅偽共晶相在566~582 ℃之間熔化， 隨著溫度的升高， 熔化相增多并互相凝聚在一起； 合適的噴射成形70Si30Al合金熱加工變形溫度為560~590 ℃。
關(guān)鍵字: 70Si30Al合金； 封裝材料； 噴射成形； 顯微組織演變
LIU Hong-wei, ZHU Bao-hong, WANG Feng
（ State Key Laboratory for Fabrication and Processing of Nonferrous Metals,
Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract: A novel 70Si30Al alloy was prepared by spray forming process for electronic packaging material. Microstructure variation of as-deposited preforms during heating procedure was studied. The results show that the microstructure is fine and homogenous, the primary silicon phases distributing in the alloy evenly are fine and irregular, and most of the phases that disperse between the primary silicon phases are supersaturated α(Al) and Al-Si Pseudo-eutectic phases. When the alloy is held under 620 ℃ for 90 min, the primary silicon phases do not increase obviously and have spheroidized phenomenon with temperature increasing. The supersaturated α（Al）phases do not change significantly during heating procedure. The Al-Si pseudo-eutectic phases remelt in the temperature range from 566 ℃ to 582 ℃, and the mass of remelting phases increase with temperature increasing and they conglomerate together. The range of hot deformation temperature of spray formed 70Si30Al alloy is from 560 ℃ to 59 ℃.
Key words: 70Si30Al alloy; packaging material; spray forming; microstructure variation
