(中南大學(xué) 材料科學(xué)與工程學(xué)院， 長(zhǎng)沙 410083)
摘 要: 采用OM、 SEM、 XRD、 力學(xué)拉伸實(shí)驗(yàn)、 硬度測(cè)試等手段研究了單獨(dú)添加Mg及同時(shí)添加Mg和Cu對(duì)鑄態(tài)Al-Fe-V-Si合金及其熱擠壓棒材顯微組織和力學(xué)性能的影響。 結(jié)果表明： 添加Mg可以明顯細(xì)化Al-Fe-V-Si合金的鑄態(tài)組織， 改善鋁鐵相的形貌與分布， 還有利于提高合金的硬度與強(qiáng)度； 同時(shí)添加Mg和Cu時(shí)， Cu部分抵消了Mg的細(xì)化作用， 但經(jīng)過(guò)熱處理后， Mg2Si、 Al2Cu和Al2CuMg相的形成， 使合金的硬度與強(qiáng)度進(jìn)一步提高。
關(guān)鍵字: Al-Fe-V-Si合金； 鎂； 銅； 組織
（School of Materials Science and Engineering, Central South University,
Changsha 410083, China）
Abstract: The effects of adding Mg element alone and adding Mg and Cu elements together on microstructure and mechanical properties of the as-cast and as-extruded bar of Al-Fe-V-Si alloy were investigated by means of OM, SEM, XRD, tensile test and hardness test. The results show that the addition of Mg element can refine the microstructure evidently, and ameliorate the appearance and distribution of iron-phase, and hence improve the hardness and strength of the alloy. With combined addition of Mg and Cu elements, Cu-present counteracts slightly the refining effect of Mg element, but due to the formation of Mg2Si, Al2Cu and Al2CuMg, the hardness and strength of the alloy can be enhanced further by heat-treatment.
Key words: Al-Fe-V-Si alloy; magnesium; copper; microstructure
