半固态ZL116合金挤压成形与显微组织  

Microstructure and Properties of ZL116 Alloy Parts Through Semi-solid Extrusion

作　　者：王平[1] 梁田[1] 赵大志[1] 崔建忠[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第1期75-78,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50374031);教育部新世纪人才支持计划项目(NCET-04-0279)

摘　　要：采用电子显微镜、卧式挤压机及电子拉伸机,研究了ZL116合金近液相线铸造的铸态显微组织,进行了触变挤压成形实验,测试了成形件的力学性能.结果表明:用近液相线半连续铸造法可以制备出具有蔷薇状组织的ZL116合金半固态坯料,当在575℃进行二次加热时,有大量细小、分布均匀的硅颗粒出现,有利于合金的半固态成形;利用800 T卧式挤压机,触变挤压飞机用的合金支架,热处理后抗拉强度Rm值达320 MPa,断后伸长率A达到11.4%.The as-cast microstructure of ZL116 alloy castings prepared by nearby liquidus casting were studied by means of electron microscope, then the mechanical properties of the parts through thixoforming extrusion were tested on horizontal extruder and electronic tensile tester. The results showed that the ZL116 aluminum alloy castings with refined rosette grains were obtained by means of near-liquidus semi-continuous casting process, in which lots of refined Si grains are found in uniform distribution when reheating the semi-solid ingots at 575 ℃, and they are advantageous to semi-solid thixoforming. The brackets used in airplane can be thixoformed successfully using the horizontal 800 T extruder by which the tensile strength can be up to 320 MPa with percentage elongation 11.4 % after heat-treatment.

关 键 词：ZL116合金 半固态 挤压 组织 力学性能 

分 类 号：TG151.2[金属学及工艺—热处理]