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Development of aluminum alloys with composite structure by squeeze casting process

挤压铸造复合结构铝合金的开发

基本信息

批准号：
63460196
负责人：
KAMIO Akihiko
金额：
$ 4.22万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460196/
关键词：
Squeeze casting Al-Li alloy Al-Li-Cu alloy Composite materials SiC whisker Aluminum composites Age hardening High strength aluminum alloy SiCウィスカ@アルミニウム複合材料高圧鋳造時効析出 Al-Cu-Mg合金 Al-Zn-Mg-Cu合金結晶粒微細化

项目摘要

Characteristics and qualities of high strength aluminum alloys/SiC whisker composites, Al-Li system alloy materials and Al-Li alloy/SiC whisker composites produced by squeeze casting process were estimated structurally and precipitation behaviors in each material were investigated.AI-2.3wt%Li-0.2wt%Zr and AI-2.3wt%Li-2.8wt%Cu-0.2wt%Zr alloy materials solidified under high pressure of 50-IOOMPa have sound solidification structure containing no pore and void defects and have no blister defects after solution heat-treatment and have superior mechanical properties in all of the specimens. AI-4wt%Cu-0.7wt%Mg, AI-5wt%Zn-2wt%Mg-1.4wt%Cu, AI-2.3wt%Li and AI-2.3wt%LI-2.8 wt%Cu alloy/SiC whisker composites processed by squeeze casting with 100MPa pressure have extremely sound interfaces between SiC whiskers and alloy matrices and have no void defects. In these composites, the hardness value at as-quenched state is very high and the age-hardening occurs with aging less than 200ﾟC, and with increase in SiC whisker volume fraction the hardness value raises, but the amount of age- hardening decreases. Under heat-treatment conditions more than 200ﾟC, high harden value of as-quenched composite materials is retained even on over-aging states. In all of these composites, manydislocations exist around SiC whiskers, which were introduced at quenching by the difference in SiC whisker and alloy matrix. In this region, peculiar aging behaviors were observed. Excess vacancies were sunk on interfaces, so precipitation of G.P. zone is retarded and metastable phases precipitates ununiformly, and then the increment in precipitation hardening decreases with increase in volume fraction of SiC whisker.

从结构上评价了高强度铝合金/SiC晶须复合材料、Al-Li系合金材料和挤压铸造工艺生产的Al-Li合金/SiC晶须复合材料的特性和质量，并研究了每种材料的析出行为。AI-2.3wt%Li-0.2wt%Zr和AI-2.3wt%Li-2.8wt%Cu-0.2wt%Zr 50-100MPa高压凝固的合金材料，固溶热处理后凝固组织良好，无气孔、空洞缺陷，无砂眼缺陷，所有试件均具有优异的力学性能。采用100MPa压力挤压铸造加工的AI-4wt%Cu-0.7wt%Mg、AI-5wt%Zn-2wt%Mg-1.4wt%Cu、AI-2.3wt%Li和AI-2.3wt%LI-2.8 wt%Cu合金/SiC晶须复合材料具有SiC晶须与合金基体之间极其良好的界面，且无空洞缺陷。在这些复合材料中，淬火状态下的硬度值非常高，时效低于200℃时就会发生时效硬化，并且随着SiC晶须体积分数的增加，硬度值升高，但时效硬化量减少。在超过200℃的热处理条件下，即使在过时效状态下，淬火复合材料仍能保持高硬化值。在所有这些复合材料中，SiC晶须周围存在许多位错，这些位错是在淬火时由于SiC晶须和合金基体的差异而引入的。在这个区域，观察到了特殊的老化行为。多余的空位沉入界面，因此G.P.的沉淀。随着SiC晶须体积分数的增加，沉淀硬化的增量减小。