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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第10期    总第223期    2017年10月

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文章编号:1004-0609(2017)-10-2005-07
蛇形轧制对Al-Cu-Mg合金板材强韧性能及微观组织的影响
胥福顺1, 2,张 劲3, 4,邓运来1, 4,张新明1, 4

(1. 中南大学 材料科学与工程学院,长沙 410083; 2. 云南冶金集团服份有限公司,昆明 650502; 3. 中南大学 轻合金研究院,长沙 410083; 4. 中南大学 高性能复杂制造国家重点实验室,长沙 410083)

摘 要: 基于实验室自制蛇形轧制装置,采用室温拉伸、Kahn撕裂、电子背散射衍射(EBSD)等测试方法对比研究蛇形轧制非对称工艺参数对Al-Cu-Mg合金轧制板材的室温强度、断裂韧性和显微组织的影响。结果表明:合理的蛇形轧制工艺在能够使Al-Cu-Mg合金板材保持强度性能的同时,显著提升其断裂韧性。当偏移量相同时,蛇形轧制板材的强度性能随着异速比增加而提高,但伸长率和断裂韧性降低;当异速比相同时,随着偏移量增加,蛇形轧制板材强度降低,伸长率和断裂韧性明显升高。在偏移量10mm且异速比为1.1的条件下,蛇形轧制试样裂纹单位形核能提升高14%~36%。这是由于蛇形轧制能够增强Al-Cu-Mg合金板材Cube织构并减弱Brass织构,形成具有更高裂纹扩展阻力的织构组态所致。

 

关键字: Al-Cu-Mg合金;蛇形轧制;力学性能;织构;裂纹扩展

Effect of snake rolling on strength, toughness and microstructure of Al-Cu-Mg alloy plate
XU Fu-shun1, 2, ZHANG Jin3, 4, DENG Yun-lai1, 4, ZHANG Xin-ming1, 4

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Yunnan Metallurgical Group Co., Ltd, Kunming 650502, China; 3. Light Alloy Research Institute, Central South University, Changsha 410083, China; 4. State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha 410083, China

Abstract:Based on the lab-made snake rolling mill, the effect of asymmetric boundary conditions on the mechanical properties and the microstructure of Al-Cu-Mg alloy rolled plates were investigated by room-temperature tensile, Kahn tear and electron back scattering diffraction (EBSD) tests. The results indicate that choosing a proper boundary condition can significantly improve the fracture toughness while maintaining the strength property. With increasing the differential peripheral speed ratio, the strength of the snake rolled plates rises, but the elongation and the fracture toughness decreases at the same offset distance. And with increasing the offset distance, the strength decreases with the dramatically elongation and fracture toughness increases at the same speed ratio. Under the condition of the offset distance of 10 mm and the speed ratio of 1.1, the crack unit initiation energy (UIE) of the snake rolled plates increase by 14%~36%. It is due to the enhanced Cube texture and the weakened Brass texture of the Al-Cu-Mg alloy plates rolled by snake rolling compared with the conventional rolling, which means the better texture components with higher crack propagation resistance.

 

Key words: Al-Cu-Mg alloy; snake rolling; mechanical property; texture; crack propagation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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