Inprovement of mechanicahl properties of Al-Li-Zr alloys due to the promoted formation of composite precipitates by using rapid solidification technology

利用快速凝固技术促进复合析出物的形成提高 Al-Li-Zr 合金的机械性能

• 批准号: 62550530
• 负责人: MURAKAMI Yotaro
• 金额: $ 1.22万
• 依托单位: Kanasai Uviversity
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550530/
• 关键词: Al-Li-Zr Alloys; Rapid Solidification; Hot Compaction; Hot Extrusion; Double Ageing; TEM obserbation; Composite Precipitation; 機械的性質; Al-Li-Zr系合金; 複合析出物

The composition of the plloys in this investigation are Al-Li alloys containing 4 Wt% Li with or without 1 wt% Zr. The alloys rapidly quenched from the melt into continuous ribbons using jet casting process by single and twin rolls. these ribbons were mechanichally comminuted to fine powder and then consolidated into bulk compacts by vacuum hot pressing and hot extrusion to wires of 2.0mm in diameter(20:<iota> extrusion tatio). These wires were further drown to wires of 1.5 and 1.6mm in diameters.The were specimes were age-treated in the following;(a) as-drown,(b) pre-aged, 500゜Cx2hrs,(c) single-aged, 190゜Cx16hrs,(d) double-aged, 500゜Cx2hrs+190゜Cx16hrs,(e) doule-aged, 500゜Cx72hrs+190゜Cx16hrs.The age-treated specimens were examind by a transmission electron microscope in order to clarify the nature, size and distribution of precipitatrs. It was found that double-ageing is very effective to the formation of composite precipitates, which is a continuous envelope of <delta>'Al_3Li surrounding the <alpha>'-Al_3Zr. The present investigation has shown that the enganced mechanical properties that were obtained were mainly due to the promoted precipitaition of composite precipitete.

本研究中的合金成分为含4wt%Li的Al-Li合金，含或不含1wt%Zr。采用单辊和双辊喷射铸造工艺，将合金从熔体中快速淬火成连续薄带。将这些带状物机械粉碎成细粉，然后通过真空热压和热挤压成直径为2.0mm的线（20：挤压比）而固结成块压块<iota>。将这些丝材进一步细化为直径为1.5和1.6mm的丝材。（a）预老化，（B）预老化，500 Ω Cx 2小时，（c）单老化，190 Ω Cx 16小时，（d）双老化，500 Ω Cx 2小时+190 Ω Cx 16小时，（e）双老化，用透射电镜观察了时效处理后的试样中沉淀物的性质、大小和分布。结果表明，双级时效对复合析出相的形成是非常有效的，复合析出相是<delta>“Al_3Li”包围<alpha>“-Al_3Zr”的连续包络。研究表明，复合沉淀物的析出促进了合金力学性能的提高。

项目成果

村上陽太郎,中尾和祺: 技苑. 55. 22-31 (1988)

村上阳太郎、中尾一树：《义恩》55. 22-31 (1988)

Kazuyoshi Nakao and Yotaro Murakami: "Rapid Solidification of Age-hardenable Aluminum Alloys" "Gien" Jounal of Faculty of Engeneering. 55. 22-31 (1988)

Kazuyoshi Nakao 和 Yotaro Murakami：“时效硬化铝合金的快速凝固”《Gien》工程学院杂志。