非破壞性探討安定化熱處理對Al-7Mg鍛造合金微結構、機械與腐蝕性質之影響;Non-destructive test technology on effect of stabilization on microstructures, mechanical properties and corrosion resistance of Al-7Mg forged-alloy

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Title:	非破壞性探討安定化熱處理對Al-7Mg鍛造合金微結構、機械與腐蝕性質之影響;Non-destructive test technology on effect of stabilization on microstructures, mechanical properties and corrosion resistance of Al-7Mg forged-alloy
Authors:	劉佳蓉;LIU, CHIA-JUNG
Contributors:	機械工程學系在職專班
Keywords:	鋁鎂合金;非破壞檢測;敏化;沿晶腐蝕;β相;導電度
Date:	2018-11-27
Issue Date:	2019-04-02 15:10:52 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究係探討B535.0(Al-7Mg) 鑄造合金改良成鋁鎂合金鍛件之可能性，再尋找該鍛造合金(暫命名為MB5350合金)之最佳安定化條件，並藉由非破壞性檢測技術(導電度量測)探討敏化對MB5350(Al-7Mg)鍛造合金之腐蝕與機械性質影響的關連性; 結果顯示，MB5350(Al-7Mg)鍛造合金較理想的安定化條件是280 ℃,1h，其結構為回復及極輕微的再結晶。合金經敏化處理後，隨敏化時間增加，其β相(Mg2Al3)析出量也逐漸上升，使導電度值增加，然其重量損失測試(依規範ASTM-G67)值具有輕微沿晶腐蝕敏感性之隱憂，對於如此高Mg合金而言屬輕微，故可論定280 ℃,1h為MB5350 (Al-7Mg)合金最佳安定化條件。另外，敏化過程對MB5350 (Al-7Mg)合金性質(抗腐蝕性與硬度)的影響，可藉由非破壞性檢測技術（導電度）作有效評估，其誤差率能控制在12 %以內。;This research discusses potential methods of improving the properties of casting alloy B535.0 (Al-7Mg) and further explored the optimal conditions for stabilizing treatment for a new alloy named MB5350 (Al-7Mg). Though non-destructive analytical testing techniques such as conductivity test, we further studied the corrosion and mechanical properties of MB5350 (Al-7Mg) alloy in response to sensitization reaction. The result of research indicated that the forging alloy of MB5350 (Al-7Mg) can get the better stability condition under the annealing process for 280 ℃, 1H. Recovery and partial recrystallized structure was found by microstructure under this condition. Furthermore, the sensitization time can cause β-phase (Mg2Al3) precipitation amount increased, and the trend of electrical conductivity show consistent as well. Yet, after ASTM G67 standard test still showed slight potential intergranular corrosion. As a result, we conclude that 280 ℃,1h is the optimal stabilization condition for MB5350 (Al-7Mg). Besides, the influence of the sensitization process for the mechanical property (Corrosion Resistance and Hardness) of MB5350 (Al-7Mg) can be effectively evaluated by the Non-Destructive Testing (Conductivity Measurement) which deviation can control within 12 %.
Appears in Collections:	[Executive Master of Mechanical Engineering] Electronic Thesis & Dissertation

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