顯微組織和室溫力學(xué)性能及斷裂機(jī)理的影響①
(北京工業(yè)大學(xué)近代力學(xué)研究室，北京100022)
摘 要: 研究了在小同相區(qū)保溫和控制冷卻速率的Fe-28Al-5Cr-0.3B-0.003Mg合金的微觀組織和室溫拉伸性能發(fā)現(xiàn)熱機(jī)械處理可提高該材料的強(qiáng)韌性，而未再結(jié)晶并具有B2結(jié)構(gòu)的試樣的綜合拉伸性能最佳；微觀組織、斷裂特征和強(qiáng)韌性能之間存在內(nèi)在聯(lián)系。
關(guān)鍵字: Fe3Al金屬間化合物 力學(xué)性質(zhì) 斷裂機(jī)理
（Research Division of Modern Mechanics,
Beijing University of Technology,Beijing 100022）
Abstract:Themicro -structuresandthetensilepropertiesatroomtemperatureofthe Fe -2 8 Al -5 Cr -0.3B -0.003Mg alloy have been examined with various holding temperatures in several phase zones and at different cooling rates. It was found that, thermally mechanical treatments can improve the alloy s strength and toughness and the comprehensive-tensile behaviours of the samples withB2 structure and with no re-crystallization structure possess optimum tensile behaviours. In addition there is an intrinsical relationship existing between microstructure，fracture characteristics, strength and toughness of the alloy tested.
Key words: Fe3Al metallic composite mechanical behaviour fracture mechanism
