(1.廣東工業(yè)大學(xué)材料系，廣州 510090；
2.中南工業(yè)大學(xué)材料科學(xué)與工程系，長沙 410083)
摘 要: 采用XRD、 OM、 SEM及EMPA，分析了新型鋁錫硅軸承合金的微觀結(jié)構(gòu)。根據(jù)相圖，探討了合金的結(jié)晶過程。結(jié)果表明：新型鋁錫硅合金的非平衡結(jié)晶相組織由α(Al)、Si、β(Sn)3 相組成。β(Sn)相依附于共晶Si凝固并以近網(wǎng)狀分布于晶界；經(jīng)過適當(dāng)?shù)木鶆蚧幚恚?I>β(Sn)相以Si為核心聚集球化而形成Sn環(huán)繞Si的軟硬相相結(jié)合的“包晶”式相結(jié)構(gòu)。此外，凝固組織的化學(xué)成分分析結(jié)果表明：合金元素未產(chǎn)生宏觀偏析現(xiàn)象。
關(guān)鍵字: 鋁錫硅合金 結(jié)晶 微觀組織
（1.Department of Materials Science and Engineering,
Guangdong University of Technology, Guangzhou 510090；
2.Department of Materials Science and Engineering,
Central South University of Technology, Changsha 410083）
Abstract:The microstructure of new Al-Sn-Si bearing alloy was analyzed by XRD, OM, SEM and EMPA. According to the equilibrium diagrams,crystallization of the alloy was discussed. It is demonstrated that the microstructure consists of α(Al), Si, and β(Sn) phases, β(Sn) phases are solidified around Si and distributed in the grain boundary as network structure. The "peritectic-type" structure of silicon surrounded with tin is formed by homogenization. Chemical analysis shows that there is no macro-segregation of the elements in the alloy.
Key words: Al-Sn-Si alloy crystallization microstructure
