压铸AlSiFeMnMgCuSc-xZr合金的组织和力学性能
Microstructure and Mechanical Properties of Die Casting AlSiFeMnMgCuSc-xZr Alloy
范晓明 1吕晓刚 1卢晓斌 2罗世旭 1黄刚福 3高小林3
作者信息
- 1. 武汉理工大学材料科学与工程学院,武汉 430070
- 2. 高安市璐克斯机械有限公司,高安 330800;高安市流体输送与控制技术研究院,高安 330800
- 3. 高安市璐克斯机械有限公司,高安 330800
- 折叠
摘要
在非真空条件下,采用普通卧式压铸机制备了Al-9Si-0.6Fe-0.2Mn-0.2Mg-0.6Cu-0.3Sc-xZr(x=0,0.1,0.2,0.3,质量分数,%)合金拉伸试样,并采用金相显微镜、扫描电镜、电子探针和电子万能材料试验机等手段研究了其铸态显微组织和力学性能.结果表明,Zr的加入增强了合金的组织细化和变质效果,合金的抗拉强度、伸长率和硬度值均随Zr含量的增加呈现先升后降的趋势.当加入质量分数为0.2%的Zr时,合金中初生α-Al相细化效果最好,由花朵状转变成细小的枝晶状;共晶Si相变质效果也达到最佳,由蠕虫状转变为颗粒状相;合金的铸态抗拉强度、伸长率和硬度(HV)达到最大值,分别为289.3 MPa、4.9%和114.3,拉伸断裂方式为韧性断裂.
Abstract
Tensile specimens of Al-9Si-0.6Fe-0.2Mn-0.2Mg-0.6Cu-0.3Sc-xZr(x=0,0.1,0.2,0.3,mass frac-tion,%)were prepared by horizontal die casting machine under non-vacuum conditions.The as-cast microstructure and mechanical properties of the alloy were investigated by metallographic microscope,scanning electron microscope,electron probe and electronic universal material testing machine.The results indicate that Zr addition can enhance the structure refinement and modification of alloy,and the tensile strength,elongation and hardness of the alloy is increased firstly and then decreased with the increase of Zr content.When 0.2%Zr is added,the primary α-Al phase has optimal refining effect,which is transformed from flower-like to fine dendrite.The eutectic Si phase also achieves desirable modification effect,which is transformed from worm-like to granular phase.The tensile strength,elongation and microhardness of as-cast alloy reach the maximum value,which are 289.3 MPa,4.9%and 114.3 HV,respec-tively,and the tensile fracture mode is characterized by ductile fracture.
关键词
Al-Si压铸合金/Zr/显微组织/力学性能Key words
Al-Si Die Casting Alloy/Zr/Microstructure/Mechanical Properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据