(1. 南昌航空大學(xué) 江西省金屬材料微結(jié)構(gòu)調(diào)控重點實驗室，南昌 330063;
2. 南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國防重點實驗室，南昌 330063;
3. 中國航發(fā)南方工業(yè)有限公司，株洲 412002)
摘 要: 采用旋轉(zhuǎn)摩擦擠壓法(RFE)制備了不同Mg含量的Al-Mg鋁合金，對其進(jìn)行力學(xué)性能測試和顯微組織觀察。結(jié)果表明：退火態(tài)的5A06基材經(jīng)RFE加工后，晶粒明顯細(xì)化，抗拉強(qiáng)度和伸長率同時提高。采用5A06和AZ31B為基材經(jīng)RFE加工制備Al-Mg合金后，合金抗拉強(qiáng)度隨Mg含量的增加而增加，但伸長率卻隨合金Mg含量的增加而降低；高M(jìn)g含量的Al-Mg合金晶粒可進(jìn)一步細(xì)化，這是由于高M(jìn)g含量的Al-Mg合金中存在Al3Mg2相，可以作為動態(tài)再結(jié)晶的形核點，促進(jìn)動態(tài)再結(jié)晶。然而，Al3Mg2相的存在會降低合金的伸長率。
關(guān)鍵字: Al-Mg合金；旋轉(zhuǎn)摩擦擠壓；晶粒；Al3Mg2相
（1. Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province, Nanchang Hangkong University, Nanchang 330063, China;
2. National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China;
3. AECC South Industry Company, Zhuzhou 412002, China）
Abstract:The Al-Mg aluminum alloys with different Mg contents were prepared by rotational friction extrusion (RFE). Their mechanical properties were tested and the microstructures were observed. The results show that the grains of the annealed 5A06 substrate after RFE processing are significantly refined. The ultimate tensile strength and elongation both increase. While the tensile strengths of Al-Mg alloys using the 5A06 and AZ31B as raw materials after RFE processing increase as the addition of Mg content increases, but the elongations decrease. Meanwhile, the grains of the Al-Mg alloy with high Mg content after RFE processing are further refined. The reason is due to the formation of Al3Mg2 phase in the Al-Mg alloy with high Mg content. The Al3Mg2 phase as the nucleation site of dynamic recrystallization, can promote the process of dynamic recrystallization. However, the existence of Al3Mg2 will reduce the elongation of Al-Mg alloys.
Key words: Al-Mg alloy; rotational friction extrusion; grain; Al3Mg2 phase
