环境温度对砂型铸造AlSi7Mg材料力学性能的影响  

Influence of ambient temperature on the mechanical properties of sand-cast AlSi7Mg alloy

作　　者：周峰[1] 徐贵宝[1] 王沛培[1] 马俊成[1] 白云[1] 

机构地区：[1]南车戚墅堰机车车辆工艺研究所有限公司,江苏常州213011

出　　处：《机车车辆工艺》2012年第3期1-3,共3页Locomotive & Rolling Stock Technology

摘　　要：浇注了3组AlSi7Mg材料砂型试棒,利用拉伸测试、扫描电镜及金相组织分析等手段,研究了砂型铸造AlSi7Mg材料的力学性能。结果表明:当环境温度从-40℃升至100℃时,AlSi7Mg材料的抗拉强度、屈服强度均有所降低,其中抗拉强度和屈服强度分别降低了14.3%和9.8%;材料的伸长率随着温度的提高不断增加;低温变形过程中材料显微组织显示共晶硅颗粒细小,分布较为均匀,试棒断口显微形貌显示局部分布着小的韧窝,具有准解理+韧窝型断裂的特征。3 sets of sand - cast AlSi7Mg test rods are prepared and their mechanical properties are studied by means of tensile testing, SEM and metallurgical structure analyses. Testing resuhs indicate that the tensile strength and yield strength of AlSiTMg material decreases respectively by 14.3% and 9.8% when the ambient temperature rises from -40℃ to100℃ , while its elongation increases with the rise of temper- ature. Evenly distributed and fine eutectic silicon particles are found in its microstructure during low tem- perature deformation, and the microstructures at the fractures of the test rods are characterized by locally distributed dimples and quasi- cleavages.

关 键 词：AlSi7Mg材料 力学性能 环境温度 

分 类 号：TG146[一般工业技术—材料科学与工程]