喷射成形过共晶Al-Si合金的组织特征和磨损行为  

Microstructure and wear characteristics of spray forming hypereutectic Al-Si alloy

作　　者：霍光[1] 谢明[2] 邓德国[2] 

机构地区：[1]昆明理工大学,云南昆明650039 [2]昆明贵金属研究所,云南昆明650221

出　　处：《轻合金加工技术》2006年第5期37-39,55,共4页Light Alloy Fabrication Technology

基　　金：云南省省院省校科技合作项目(2001ABBEA00A006)

摘　　要：采用喷射成形技术制备了过共晶Al-Si耐磨合金,分析了合金的显微组织结构,利用M200磨损试验机对喷射成形和铸造Al-Si合金的耐磨性和磨损失效形式进行了分析比较。结果表明:喷射成形能够显著改变过共晶Al-Si合金中初晶Si相的形态和尺寸,细化合金的基体组织;与普通铸造合金相比,具有更好的耐磨性能。Hypereutectic Al-Si alloy were fabricated making use of spray forming and conventional casting process, respectively.The mierostructures of the resulting hypereuteetie Al-Si Alloys were investigated. The wear resistance of the Al-Si alloys sliding against 45 steel was examined on a M200 friction and wear tester. The results showed that the spray forming hypereutectie Al - Si alloys was composed of α-Al matrix and Si particles uniformly distributed therein, with the shape and size, of the primary Si different from that of the conventional as-cast Al-Si hypereutectic alloy. The spray forming hypereutectic Al-Si alloy sliding against 45 steel had much better wear resistance than the conventional as-cast Al-Si hypereutectic alloy against the same counterpart as well, which was attributed to the different microstructures of the two alloy specimens. Namely, the fine Si particles in the spray forming hypereutectie Al-Si alloy were well bonded to the α-Al matrix and were not liable to break and peel off under the shear stress, while the coarse Si particles in the conventional as-cast Al-Si hypereutectic alloy were weakly bonded to the alloy matrix and liable to peeloff in sliding against the steel, owing to the concentrated shearing stress at the sharp edges of the Si particles.

关 键 词：喷射成形 过共晶AL-SI合金 磨损特性 

分 类 号：TF124.39[冶金工程—粉末冶金] TG146.2[冶金工程—冶金物理化学]