摘要
采用自制的波浪型倾斜板振动装置对AZ91D镁合金半固态坯料的制备及触变成形进行研究。结果表明,在倾角为45？,振幅1.45 mm,浇注温度630-650℃的条件下,采用波浪型倾斜板振动技术可以制备出组织优良的半固态AZ91D镁合金坯料,坯料由细小的等轴晶组成,并在二次加热温度为575℃、保温时间30-60 min的条件下球化理想。通过触变锻压,在模具的预热温度为400-450℃时,制备出表面光洁、组织优良的成品制件。触变锻压时,液相流动是主要的变形方式。制品上部由于液相偏聚,硬度较低;下部由于固相的微塑性变形,硬度较高。
Preparation of semisolid billets of AZ91D magnesium alloy and thixoforming by using self-made wavelike sloping plate setup were studied. It is shown that, when the sloping anger is 45°, the amplitude is 1.45 mm and the casting temperature is 630-650 ℃, the semisolid billets with good microstructures can be prepared. The billets are composed of f＇me equiaxed grains. When the billets are remelted at 575 ℃ for 30-60 min, spheroidization of the semisolid billet is perfect. When the mould preheating temperature is 400-450 ℃, thixoforming product with fine surface and good microstructures can be manufactured. During thixoforging, liquid flow is the main deformation pattern. Due to the liquid aggregation in the upper part of the product, the corresponding hardness is lower; however, there is a small solid plastic deformation in the bottom of the product, so the corresponding hardness is higher.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2007年第11期1798-1802,共5页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展863计划资助项目(2007AA03Z111)
国家自然科学基金资助项目(50604007)
辽宁省中小企业创新基金资助项目(辽科2007-24)
辽宁省自然科学基金资助项目(20062016)
