(1. 湖南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410082；
2. 湖南大學(xué) 湖南省噴射沉積技術(shù)及應(yīng)用重點實驗室，長沙 410082)
摘 要: 通過差熱分析、金相顯微鏡、掃描電子顯微鏡、能譜分析、硬度和電導(dǎo)率測試等方法，對一種新型Al-Mn合金鑄錠均勻化過程中的組織演變和性能變化規(guī)律進(jìn)行研究。結(jié)果表明：在加熱溫度為560~620 ℃、保溫時間為12~72 h的均勻化處理過程中，合金鑄錠的電導(dǎo)率隨溫度的升高或保溫時間的延長逐漸降低，但硬度先持續(xù)降低后在高于600 ℃均勻化時反而升高；合金鑄錠由枝晶和晶間非平衡相組成，隨均勻化溫度的升高和保溫時間的延長，晶間析出相逐漸溶解、球化，晶內(nèi)細(xì)小彌散相大量析出；合金較優(yōu)的熱處理制度為600 ℃、24 h。
關(guān)鍵字: Al-Mn合金；均勻化；性能；顯微組織；析出相
（1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
2. Hunan Province Key Laboratory for Spray Deposition Technology and Application,
Hunan University, Changsha 410082, China）
Abstract:The evolution of microstructure and properties of a new Al-Mn alloy ingot during homogenization treatment was researched by differential scanning calorimetry (DSC), optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), as well as measurement of hardness and conductivity test, respectively. The results show that both the conductivity and the hardness of Al-Mn alloy ingot decrease with the increase of temperature in the range of 560-620 ℃ or the extension of holding time in the range of 12-72 h, but hardness at 620 ℃ is higher than that at 600 ℃. The cast alloy is composed of dendrite segregation and non-equilibrium phase. The precipitated phases gradually dissolve and become spherical, and the dispersity of precipitates within the grains increases with increasing homogenization temperature and holding time. The reasonable homogenization condition for the studied alloy is 600 ℃ and 24 h.
Key words: Al-Mn alloy; homogenization; property; microstructure; precipitated phase
