摘要
研究了低Si合金化对Mg8Zn4Al0.3Mn合金组织和性能的影响。试验表明Si能明显提高合金的流动性和耐磨性,并能细化合金晶粒。当Si量(质量分数)小于0.41%时,合金的显微硬度、刚度、强度和塑性都得到了明显的提高。而当Si量(质量分数)达0.69%时,由于汉字状Mg2Si的出现,导致合金的显微硬度、刚度和塑性呈现下降趋势。同时由于剩余液相中Zn、Al摩尔浓度的降低使得τ相的析出受到抑制,而φ相的析出得到促进。
Effects of low Si content on the microstructure and properties of Mg-8Zn-4Al-0.3Mn alloy were investigated.It was found that the fluidity and wear resistance of the alloy can be remarkably improved by adding Si,and the grain size can be refined also.The micro-hardness,rigidity,tensile strength and plasticity of the alloy can be obviously increased with Si content lower than 0.41% while can be remarkably decreased due to the occurrence of character Mg_2Si phase in the alloy with the Si content up to 0.69%,meanwhile,precipitation of τ phase can be restrained and precipitation of φ phase can be promoted resulting from the decrease of Zn,Al atomic fraction in residual liquid phase.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2005年第7期400-402,共3页
Special Casting & Nonferrous Alloys
基金
河南省高校创新人才基金资助项目(豫教2002-10)。
