摘要
研究了挤压铸造Al-Si-Mg合金中的共晶Si团聚现象对其力学性能和耐腐蚀性能的影响。结果表明,挤压铸造Al-Si-Mg合金存在共晶Si团聚现象,且这种铸态下的团聚现象在固溶处理后仍然存在,其对合金的耐蚀性以及力学性能均存在影响。耐腐蚀性能研究表明,T6处理后共晶Si聚集严重,试样的腐蚀电位为-820 mV,腐蚀电流密度为1.91×10^(-5)A/cm^(2),共晶Si分布均匀的试样的腐蚀电位为-790 mV,腐蚀电流密度为1.08×10^(-5)A/cm^(2)。腐蚀沿Si相团聚的区域进行,共晶Si分布均匀的试样的耐腐蚀性能更优。T6热处理后共晶Si的团聚对合金的伸长率影响较大,Al-Si-Mg合金中共晶Si分布相对均匀时,伸长率最高,达到14.12%,其抗拉强度达到332 MPa,屈服强度为271 MPa;共晶Si相团聚多、分布不均匀时,合金经T6处理后的伸长率为10.12%,抗拉强度为324 MPa,屈服强度为259 MPa。
The effects of eutectic Si agglomeration on mechanical properties and corrosion resistance of squeeze casting Al-Si-Mg alloy were investigated. The results reveal that the squeeze casting Al-Si-Mg alloy presents the eutectic Si agglomeration, which keeps after solid solution treatment and has adverse effects on the mechanical properties and corrosion resistance of the alloy. Corrosion test results reveal that after T6 heat treatment, the sample with eutectic Si aggregation has a corrosion potential of-820 mV and a corrosion current density of 1.91×10^(-5)A/cm^(2), and that with uniform eutectic Si distribution has a corrosion potential of-790 mV and a corrosion current density of 1.08×10^(-5)A/cm^(2). The corrosion cracks can be observed along the region where Si phase is aggregated. The sample with uniform eutectic Si distribution has better corrosion resistance. For mechanical properties, the agglomeration of eutectic Si has an adverse effect on the elongation of the alloy after T6 heat treatment. When the eutectic Si distribution is relatively uniform, the elongation and the tensile strength as well as the yield strength of the alloy reach up to 14.12%, 332 MPa, and 271 MPa, respectively. When the eutectic Si phase is agglomerated and unevenly distributed, the elongation and the tensile strength as well as yield strength of the alloy reach 10.12%, 324 MPa and 259 MPa, respectively.
作者
周威虎
王瑞
王东涛
李俊
张孝足
张海
Zhou Weihu;Wang Rui;Wang Dongtao;Li Jun;Zhang Xiaozu;Zhang Hai(High-performance Metal Structural Materials Research Institute,School of Iron and Steel,Soochow University)
出处
《特种铸造及有色合金》
CAS
北大核心
2022年第7期864-869,共6页
Special Casting & Nonferrous Alloys
作者简介
第一作者:周威虎,男,1995年出生,硕士研究生,江苏苏州(215000),E-mail:406873880@qq.com;通信作者:王东涛,男,1991年出生,博士研究生,江苏苏州(215000),E-mail:dtwang@suda.edu.cn
