力學(xué)性能的影響
(1. 東南大學(xué) 機(jī)械工程系, 南京 210018;
2. 江蘇永益鑄管股份有限公司, 靖江 214500)
摘 要: 考察了Al-1B中間合金對0.030%Sr變質(zhì)的Al-11.6%Si-0.4%Mg合金組織和力學(xué)性能的影響。 發(fā)現(xiàn)Al-B中間合金在近共晶鑄造Al-Si合金中具有優(yōu)異的枝晶細(xì)化能力。 通過比較3種不同熔體處理?xiàng)l件下(未變質(zhì)＋未枝晶細(xì)化處理、 0.030%Sr變質(zhì)處理、 0.030%Sr+0.028%B聯(lián)合熔體處理)合金鑄態(tài)和T6狀態(tài)下的力學(xué)性能并對斷口形貌進(jìn)行分析， 可以得出在近共晶鑄造Al-Si合金中同時加入Sr, B進(jìn)行枝晶細(xì)化和共晶Si變質(zhì)聯(lián)合處理是十分必要的。
關(guān)鍵字: 鍶; 硼; 鋁硅合金; 力學(xué)性能; 組織
（1. Department of Mechanical Engineering, Southeast University,
Nanjing 210018, China;
2. Jiangsu Yongyi Casting Pipe Joint-stock
Company Limited, Jinjiang 214500, China）
Abstract:The influence of addition of Al-1B master alloy on the microstructure and mechanical properties of Al-11.6%Si-0.4%Mg alloy modified with 0.030%Sr were discussed. It is found that the Al-B master alloy has a very strong power of refining dendrite in near-eutectic Al-Si casting alloys. The mechanical properties and the fractographs of the alloy as-cast and after T6 heat treatment by three different melt treatments (no modifying+no refining, 0.030%Sr modifying, 0.030%Sr modifying+0.028%B refining) were also compared. It is concluded that the combined melt treatment of Sr+B is very necessary and important to improve the mechanical properties of the near-eutectic Al-Si casting alloys, especially the ductility.
Key words: strontium; boron; Al-Si alloy; mechanical property; microstructure
