低温轧制与时效协同作用下6000系铝合金微观组织演变规律及高强耐IGC机制

项目名称： 低温轧制与时效协同作用下6000系铝合金微观组织演变规律及高强耐IGC机制

项目编号： No.51301027

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 王芝秀

作者单位： 常州大学

项目金额： 25万元

中文摘要： 强度和晶间腐蚀（IGC）敏感性之间的矛盾，制约着6000系铝合金在航空工业中的广泛应用。本项目拟采用低温轧制与时效相结合的方法，深入研究预时效、低温轧制变形和再时效处理过程中6000系铝合金微观组织演变规律；建立合金力学行为、IGC敏感性与微观组织演变之间的定性、定量关系；揭示6000系铝合金高强耐IGC的微结构特征及形成机制；在上述研究基础上，优化出既提高强度又能消除IGC敏感性的工艺参数。目前，铝合金低温轧制研究侧重于拉伸性能的改善，而尚未涉及6000系铝合金IGC问题，因此，本项目具有较强的新颖性。此外，本项目相关研究成果，将为进一步提高6000系航空铝合金综合性能提供理论依据。

中文关键词： 铝合金；形变热处理；力学性能；晶界腐蚀；微观组织

英文摘要： Furhter applications of age hardenable Al-Mg-Si-Cu aluminum alloys in aerospace industry are resitricted due to the contradictory trend between high strength and susceptibility to intergranular corrosion(IGC). However, our early study has shown that simutaneaous improvement in both strength and resistance to IGC of the alloys can be achieved through cryorolling and ageing. In order to systematicly and profoundly understand the effect of the new treatment on age hardenable aluminum alloys, we will investigate the microstructural evolutions of 6000 aluminum alloys during preageing, cryorolling and reageing; establish the internal relationship between microstructures and mechanical behaviors and IGC susceptibility; discloruse the characteristic microstructures of the alloys with high strength and resistance to IGC and its formation mechanism; provide a set of optimised processing parameters for production of high performance 6000 aluminum alloys.At the presnt time, demestic and foreign studies on cryorolling focus on mechanical properties of metals and alloys,without involving IGC susceptibility of aluminum alloys. Additionally,it is of great importance in aerospce industry for simultaneous improvement in strength and resistance to IGC of 6000 aluminum alloys.

英文关键词： aluminum alloys；thermo-mechanical treatment；mechanical properties；intergranular corrosion；microstructure