Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第5期    总第218期    2017年5月

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文章编号:1004-0609(2017)-05-0877-08
固溶处理对7B52铝合金板材力学性能和断裂行为的影响
祝国川1,熊柏青1,佟有志2,张永安1,黄树晖1,李志辉1,李锡武1,李明原1

(1. 北京有色金属研究总院 有色金属材料制备加工国家重点实验室,北京 100088;
2. 东北轻合金有限责任公司,哈尔滨 150060
)

摘 要: 采用室温拉伸实验和夏比冲击实验测试力学性能,采用扫描电子显微镜(SEM)和电子背散射衍射(EBSD)分析平均晶粒尺寸、再结晶晶界比例及断口形貌等显微组织特征,通过分析显微组织与断裂行为之间的关系,研究固溶处理对7B52铝合金板材力学性能和断裂行为的影响。结果表明:随着固溶温度的升高,合金组织中Mg(Zn, Cu, Al)2四元相回溶速度、再结晶比例增加,当温度超过480 ℃时,对合金力学性能不利;475 ℃固溶1h后,随着时间的延长,显微组织变化不明显。7B52合金断裂机制为穿晶断裂和沿晶断裂并存的混合型断裂,沿晶裂纹沿着再结晶晶界扩展,富Fe/Mn的难溶第二相是发生穿晶断裂的主要原因。

 

关键字: 7B52铝合金板材;固溶处理;力学性能;断裂行为

Effect of solution treatment on mechanical properties and fracture behavior of 7B52 aluminum alloy plate
ZHU Guo-chuan1, XIONG Bai-qing1, TONG You-zhi2, ZHANG Yon-gan1,HUANG Shu-hui1, LI Zhi-hui1, LI Xi-wu1, LI Ming-yuan1

1. State Key Laboratory of Nonferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. Northeast Light Alloy Co. Td, Harbin 150060, China

Abstract:The effect of solution treatment on mechanical properties and fracture behavior of 7B52 aluminum alloy plate were investigated in this work. The mechanical properties were investigated by tensile test and Charpy impact test, while scanning electron microscopy (SEM) and Electron Back-Scattering Diffraction (EBSD) were used to characterize average grain sizes and fraction of recrystallized grain. The results show that the degree of solid solution and recrystallization increase with the solution temperature increases. When the temperature exceeds 480 ℃, the mechanical properties of 7B52 alloy is weakened. When the solution treatment at 475 ℃ and the time exceeds 1 h, the microstructure changes very little with the time prolonges. The fracture mechanism of 7B52 aluminum alloy is transgranular fracture and intergranular fracture coexist mixed fracture, and recrystallized grain boundary is the inter-granular crack behavior propagation path, and the transgranular fracture behavior is significantly affected by Fe/Mn rich undissolved second phase.

 

Key words: 7B52 aluminum alloy plate; solution treatment; mechanical property; fracture behavior

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

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

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