T76时效对超高强铝合金力学性能与抗腐蚀性能的影响  

Effect of T76 temper on mechanical properties and corrosion resistance of an ultra-high strength aluminum alloy

作　　者：杨帆[1] 许晓静[1] 邓平安[1] 朱金鑫[1] 丁清[1] 汪成松 

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013

出　　处：《材料热处理学报》2016年第11期40-44,共5页Transactions of Materials and Heat Treatment

基　　金：江苏省工业科技支撑计划项目(BE2008118);江苏大学优秀青年学术骨干培育专项基金(1211110001)资助;江苏省高校研究生科研创新计划项目(CXLX110563);江苏高校优势学科建设项目

摘　　要：采用硬度与电导率测试、拉伸试验、晶间腐蚀和剥落腐蚀试验、扫描电镜（SEM）观察以及XRD分析,研究了Al-11.54Zn-3.51Mg-2.26Cu-0.24Zr-0.0025Sr铝合金经预回复（250℃×24 h＋300℃×6 h＋350℃×6 h＋400℃×6 h）-固溶（450℃×2 h＋460℃×2 h＋470℃×2 h）-预压缩（2%~3%）-T76时效（121℃×5 h＋153℃×16 h）后的抗拉强度、硬度、电导率、晶间腐蚀和剥落腐蚀性能。结果表明,与同状态下经T6时效后的性能相比,T76时效后合金硬度和强度都明显下降,分别降低了9.59%、12.46%,但仍然保持较高水平;其电导率和伸长率分别提高了19.64%和28.13%;剥落腐蚀从EB级提高到EA级;晶间腐蚀深度从147.5μm变为113.11μm。Mechanical properties and corrosion resistance of Al-11. 54Zn-3. 51Mg-2. 26Cu-0. 24Zr-0. 0025 Sr alloys after pre-recoveryannealing（ 250 ℃ × 24 h ＋ 300 ℃ × 6 h ＋ 350 ℃ × 6 h ＋ 400 ℃ × 6 h）-solid solution（ 450 ℃ × 2 h ＋ 460 ℃ × 2 h ＋ 470 ℃ × 2 h）-pre-compression（ 2%-3%）-T76 temper（ 121 ℃ × 5 h ＋ 153 ℃ × 16 h） and T6 temper were investigated by means of hardness test,electrical conductivity,tensile properties,inter-granular / exfoliation corrosion experiments,and scanning electron microscopy and XRD.The result shows that compared with the performance in T6 temper,the hardness and strength of the alloy are significantly decreased in the T76 temper,which are reduced by 9. 59% and 12. 46%,respectively,but it is still maintained a relatively high level. The electrical conductivity and elongation increase by 19. 64% and 28. 13%,respectively,exfoliation corrosion increases from EB to EA grade,and inter-granular corrosion depth decreases from 147. 5 μm to113. 11 μm for the alloy in T76 temper compared with that in T6 temper.

关 键 词：T76时效 力学性能 晶间腐蚀 剥落腐蚀 

分 类 号：TG146.2[一般工业技术—材料科学与工程]