冯 迪.喷射成形7055铝合金初生相 在“Al3Zr调控热处理”中的演变行为[J].稀有金属材料与工程,2020,49(12):4253~4261.[Feng Di.The primary phase’s evolution behavior during the regulation of Al3Zr dispersoid for spray forming 7055 aluminum alloy[J].Rare Metal Materials and Engineering,2020,49(12):4253~4261.]
喷射成形7055铝合金初生相 在“Al3Zr调控热处理”中的演变行为
投稿时间:2019-12-18  修订日期:2020-03-16
中文关键词:  喷射成形  7055铝合金  形变前预热处理  Al3Zr相  Al2CuMg相
基金项目:国家自然科学基金项目(51801082),江苏省大学生创新创业训练计划项目(201910289095Y)
中文摘要:
      采用金相(OM)观察、扫描电镜(SEM)观察、透射电镜(TEM)观察以及X射线物相分析(XRD)研究了喷射成形7055铝合金初生相在“形变前预热处理”过程中的演变规律。结果表明:初生相为AlZnMgCu相和Al7Cu2Fe.相,其中晶内相呈小尺寸棒状,晶界相为AlZnMgCu相和Al7Cu2Fe相的共生组织,呈粗大不规则状。低温(≤400°C)调控时,由于合金元素扩散能力弱,初生相少量回溶,但相中Zn元素质量分数明显降低;中温(≤450°C)调控时,小尺寸晶内初生相基本回溶,但是粗大晶界相演变为椭球状的Al2CuMg相(S相);高温(470°C)调控使晶内晶界初生相完全回溶且避免了Al2CuMg相(S相)的大量出现。单、双级调控效果比较表明,双级调控下初生相的演变规律取决于第二级热处理温度。
The primary phase’s evolution behavior during the regulation of Al3Zr dispersoid for spray forming 7055 aluminum alloy
英文关键词:Spray forming  7055 aluminum alloy  Pre-heattreatment before deformation  Al3Zr dispersoids  Al2CuMg phase
英文摘要:
      Evolution of the primary phase of spray forming 7055 aluminum alloy during pre-heattreatment before deformation was studied by SEM, TEM and XRD test. The primary phases of as-sprayed 7055 alloy are AlZnMgCu phase and Al7Cu2Fe phase. The AlZnMgCu phases are fine in the grain while the ones on the grain boundary are coarsed. The grain boundary phases formed as a symbiotic microstructure including AlZnMgCu and Al7Cu2Fe phase. When the treat temperature below 400℃, the dissolution of primary phase is less due to the low diffusion coefficient. However, the Zn content has an apparently decline in both intragranular phase and grain boundary phase. When the temperature increases to 450℃,the fine primary phase is completely dissolved, while the coarsened phases on grain boundary transformed to an ellipsoid-like Al2CuMg phase. When treated at 470℃, inner phase has the same dissolved behaviour but the transformation of grain boundary phase to Al2CuMg is avoided. The results show that the evolution of primary phase depends on the second pre-heattreatment temperature.
作者单位E-mail
冯 迪 江苏科技大学 材料科学与工程学院 difeng1984@aliyun.com 
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