7085铝合金固溶温度预热后的大应变变形强化

上海交通大学学报（自然版） ›› 2011, Vol. 45 ›› Issue (06): 911-914.

7085铝合金固溶温度预热后的大应变变形强化

许晓静, 吴桂潮, 王彬, 张福豹, 罗勇等

(江苏大学先进成形技术研究所，江苏镇江 212013)

收稿日期:2010-07-01 出版日期:2011-06-29 发布日期:2011-06-29
基金资助:
江苏省科技支撑计划项目(BE2008118)，国家自然科学基金项目(51074079)，江苏大学拔尖人才基金项目(1211110001)

Strengthening of 7085 Al Alloy by Large Strain Deformation with the Alloy Preheated at Solution Treatment Temperature

XU Xiao-Jing, WU Gui-Chao, WANG Bin, ZHANG Fu-Bao, LUO Yong……

(Institute of Advanced Forming Technology, Jiangsu University, Zhenjiang 212013, Jiangsu, China)

Received:2010-07-01 Online:2011-06-29 Published:2011-06-29

摘要/Abstract

摘要： 提出了一种工艺性能好并能将位错强化和其他强化机制有机结合的超高强7085铝合金制备技术路线，即先在固溶处理温度对7085铝合金进行预热，然后，进行铝合金冷却速度较快的大应变变形等通道转角挤压(ECAP）加工.结果表明，ECAP加工对7085铝合金产生的强化与所用模具的温度密切相关，与模具温度为400 °C的ECAP加工相比，模具温度为室温的ECAP加工对7085铝合金的强化效果显著.基于Taylor公式的定量计算结果表明，该显著的强化主要不是来自于位错强化的增加，而是来自于其他强化机制（沉淀强化、晶界/亚晶界强化等）的作用.

关键词: 超高强铝合金, 大应变变形, 强化机制

Abstract: A new precedure to prepare ultra-high strength aluminum alloy was proposed. The procedure is carried out through subjecting the aluminum alloy pre-heated at solid solution treatment temperature to the large strain deformation (equalchannel angular pressing, i.e. ECAP) with appropriately quick cooling of the alloy. This approach can process low ductility aluminum alloy and has the potential of adding dislocation strengthening and other strengthening together to significantly strengthen the alloy. The experimental results show that the ECAP-resulted strengthening for the 7085 Al alloy preheated at solid solution treatment temperature is related with the temperature of the used ECAP die. Compared to the ECAP proceesing with the ECAP die temperature of 400 °C, the ECAP proceesing with the ECAP die temperature at room temperature leads to a considerable increase in strengthening. The theorical calculation based on Taylor equation on strength dislocation density relationship indicates that the dominant factor for leading to the considerable increase in strengthening is not dislocation strengthening increase, but other strengthening mechanisms that are believed to be precipitation strengthening and grain boundary/subgrain boundary strengthening.

Key words: ultra-high strength Al alloy, large strain deformation, strengthening mechanism

中图分类号:

TG174.4

许晓静, 吴桂潮, 王彬, 张福豹, 罗勇等. 7085铝合金固溶温度预热后的大应变变形强化[J]. 上海交通大学学报（自然版）, 2011, 45(06): 911-914.

XU Xiao-Jing, WU Gui-Chao, WANG Bin, ZHANG Fu-Bao, LUO Yong……. Strengthening of 7085 Al Alloy by Large Strain Deformation with the Alloy Preheated at Solution Treatment Temperature[J]. Journal of Shanghai Jiaotong University, 2011, 45(06): 911-914.

参考文献

［1］XU Xiaojing, CAO Jinqi, CHENG Xiaonong， et al. Tensile properties of 2024 Al alloy processed by enhanced solidsolution and equalchannel angular pressing ［J］. Transactions of Nonferrous Metals Society of China, 2006, 16(S3): 15411544.

［2］Valiev R Z, Islamgaliev R K, Alexandrov I V. Bulk nanostructured materials from severe plastic deformation ［J］. Progress in Materials Science, 2000, 45(2): 102189.

［3］Ruslan Z V, Langdon T G. Principles of equalchannel angular pressing as a processing tool for grain refinement［J］. Progress in Materials Science, 2006, 51(7): 881981.

［4］Langdon T G. The principles of grain refinement in equalchannel angular pressing ［J］. Materials Science and Engineering A. 2007, 462(12): 311.

［5］SAE AMS 4329A. Aluminum alloy, plate (7085T7651) 7.5Zn1.6Cu1.5Mg0.12Zr solution heat treated, stressrelieved, and overaged［S］.

［6］Chakrabarti D J, Liu J, Sawtell R R， et al. New generation high strength high damage tolerance 7085 thick alloy［J］. Materials Forum, 2004, 28: 969973.

［7］Youssef K M, Scattergood R O, Murty K L, et al. Nanocrystalline AlMg alloy with ultrahigh strength and good ductility［J］. Scripta Materialia, 2006, 54(2): 251256.

［8］Zhao Y H, Liao X Z, Jin Z， et al. Microstructures and mechanical properties of ultrafine grained 7075 Al alloy processed by ECAP and their evolutions during annealing ［J］. Acta Materialia, 2004, 52(15): 45894599.

［9］Bowen J R, Prangnell P B, Jensen D J, et al. Microstructural parameters and flow stress in Al0.13% Mg deformed by ECAE processing ［J］. Materials Science and Engineering A,2004,387389(15):235239.

［10］Lapovok R, Dalla Torre F H, Sandlin J， et al. Gradient plasticity constitutive model reflecting the ultrafine microstructure scale: The case of severely deformed copper ［J］. Journal of the Mechanics and Physics of Solids, 2005, 53(4): 729747.

［11］Boyer H E, Gall T L. Metals Handbook ［M］. Traverse City, Michigan: ASM International,1985：160.