在740℃下采用Al-3P作为变质剂对Al-Si合金进行变质处理。利用光学显微镜、Image Pro Plus 6.0软件、扫描电镜和万能电子试验机研究硅含量(7、8、9、10和11,质量分数,%)及变质剂Al-3P加入量(0、0.1、0.3、0.6、1.0和1.5,质量分数,%)对...在740℃下采用Al-3P作为变质剂对Al-Si合金进行变质处理。利用光学显微镜、Image Pro Plus 6.0软件、扫描电镜和万能电子试验机研究硅含量(7、8、9、10和11,质量分数,%)及变质剂Al-3P加入量(0、0.1、0.3、0.6、1.0和1.5,质量分数,%)对合金显微组织与拉伸性能的影响。结果表明,当变质剂加入量为0.6%时,随着硅含量的增加,变质Al-Si合金中初晶α(Al)相的面积分数增加较多,这一结果可以通过Al-3P的变质引起非平衡共晶点的变化来解释。当合金中硅含量一定(Al-10Si)时,随着变质剂加入量的增加,Al-10Si合金中初晶α(Al)相面积分数先增加后减少。当添加0.6%Al-3P中间合金时,初晶α(Al)相的面积分数达到最大值。与未变质的Al-10Si合金相比,当加入0.6%Al-3P中间合金进行变质处理后,合金的抗拉强度和伸长率分别提高了2.3%和47.0%,拉伸断口呈现出明显的韧性断裂特征。展开更多
The microstructure, fracture morphology and mechanical properties of Al-10 Si alloy modified with Al-5 Ti were analyzed and tested by optical microscopy, scanning electron microscopy, and universal electronic testing ...The microstructure, fracture morphology and mechanical properties of Al-10 Si alloy modified with Al-5 Ti were analyzed and tested by optical microscopy, scanning electron microscopy, and universal electronic testing machine. Compared with unmodified Al-10 Si alloy, the area fraction of α-Al phase in Al-10 Si alloy modified at 740 °C increased first and then decreased with the increase of added amounts of Al-5 Ti, and reached the maximum when the added amount of Al-5 Ti was 0.5 wt.%. When the modification temperature increased from 700 to 740 °C with Al-5 Ti being fixed at 0.5 wt.%, α-Al dendrites were refined obviously and the area fraction remarkably increased. Compared with unmodified Al-10 Si alloy, the ultimate tensile strength and elongation of the alloy modified at 740 °C with 0.5 wt.% Al-5 Ti increased by 9% and 49%, respectively. The fracture surface of modified alloy predominantly exhibited ductile fracture.展开更多
基金Projects(51571039,51671037)supported by the National Natural Science Foundation of ChinaProject(KYCX18-0820)supported by Postgraduate Research and Practice Innovation Program of Jiangsu Province,ChinaProject supported by Qing Lan Program of Education Department of Jiangsu Province,China
文摘在740℃下采用Al-3P作为变质剂对Al-Si合金进行变质处理。利用光学显微镜、Image Pro Plus 6.0软件、扫描电镜和万能电子试验机研究硅含量(7、8、9、10和11,质量分数,%)及变质剂Al-3P加入量(0、0.1、0.3、0.6、1.0和1.5,质量分数,%)对合金显微组织与拉伸性能的影响。结果表明,当变质剂加入量为0.6%时,随着硅含量的增加,变质Al-Si合金中初晶α(Al)相的面积分数增加较多,这一结果可以通过Al-3P的变质引起非平衡共晶点的变化来解释。当合金中硅含量一定(Al-10Si)时,随着变质剂加入量的增加,Al-10Si合金中初晶α(Al)相面积分数先增加后减少。当添加0.6%Al-3P中间合金时,初晶α(Al)相的面积分数达到最大值。与未变质的Al-10Si合金相比,当加入0.6%Al-3P中间合金进行变质处理后,合金的抗拉强度和伸长率分别提高了2.3%和47.0%,拉伸断口呈现出明显的韧性断裂特征。
基金The authors are grateful for the financial supports from the National Natural Science Foundation of China(51771035,51671037)Natural Science Foundation of Jiangsu Province,China(BK20161190)the Priority Academic Program of Jiangsu Higher Education Institutions,China.
基金financially supported by the National Natural Science Foundation of China(No.51571039)
文摘The microstructure, fracture morphology and mechanical properties of Al-10 Si alloy modified with Al-5 Ti were analyzed and tested by optical microscopy, scanning electron microscopy, and universal electronic testing machine. Compared with unmodified Al-10 Si alloy, the area fraction of α-Al phase in Al-10 Si alloy modified at 740 °C increased first and then decreased with the increase of added amounts of Al-5 Ti, and reached the maximum when the added amount of Al-5 Ti was 0.5 wt.%. When the modification temperature increased from 700 to 740 °C with Al-5 Ti being fixed at 0.5 wt.%, α-Al dendrites were refined obviously and the area fraction remarkably increased. Compared with unmodified Al-10 Si alloy, the ultimate tensile strength and elongation of the alloy modified at 740 °C with 0.5 wt.% Al-5 Ti increased by 9% and 49%, respectively. The fracture surface of modified alloy predominantly exhibited ductile fracture.
