压射速度对压铸Al-10%Si合金组织与性能的影响  

Influence of Injection Speed on Microstructure and Mechanics Properties of Die Casting Al-10%Si Alloys

作　　者：黄晓锋[1] 田载友[1] 曹喜娟[1] 朱凯[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

出　　处：《中国铸造装备与技术》2009年第1期20-23,共4页China Foundry Machinery & Technology

基　　金：甘肃省自然科学基金资助项目(3ZS062-B25-026);兰州理工大学博士基金(SB01200406)

摘　　要：基于液态压铸技术,研究了压射速度对Al-10%Si合金组织与性能的影响,同时利用扫描电子显微镜(SEM)对其拉伸断口形貌进行分析。实验结果表明:随着压射速度的增大,试样的抗拉强度、伸长率和硬度先增加而后减小,而晶粒尺寸先减小而后增大;随着压射速度的增大,合金的断裂方式仍然属韧窝型韧性断裂。在本实验条件下,压射比压16MPa、模具温度150℃、浇注温度720℃、压射速度2.5m/s时,压铸Al-10%Si合金的力学性能较优,其力学性能可以达到σb=233MPa,δ5=8.57%,HBS=57.9。The influence of injection speed on the microstructure and mechanics properties of die casting Al-10% Si aluminum alloy has been investigated by liquid die casting technology and analysis on fracture surface done by scanning electron microscopy.The research results indicated that with the increase of the injection speed, the tensile strength, percentage elongation and HBS was increased firstly and then decreased, while grain size was decreased firstly and then increased; with the increase of injection speed, the fracture mode of the material was still of tough fracture mode. Under this experiment conditions that the pouring temperature of 720℃ and die temperature of 150℃ and injection speed of 2.5m/s and injection specific pressure of 16MPa, the results showed that the mechanics properties of Al-30%Si alloy could reach σb=233MPa, δ5=8.57%, HBS=57.9.

关 键 词：AL-SI合金 压射速度 组织 力学性能 

分 类 号：TG249.2[金属学及工艺—铸造]