湖南大学学报（自然科学版）
湖南大學學報（自然科學版）
호남대학학보（자연과학판）
JOURNAL OF HUNAN UNIVERSITY(NATURAL SCIENCES EDITION)
2014年
7期
17-22
,共6页
微观组织%力学性能%Al-Si-Mg合金%热处理
微觀組織%力學性能%Al-Si-Mg閤金%熱處理
미관조직%역학성능%Al-Si-Mg합금%열처리
microstructure%mechanical properties%Al-Si-Mg alloy%heat treatments
采用控制变量法,研究了 Cu,Ce 元素添加对 Al-7 Si-0.35 Mg 合金铸态及505℃10h固溶淬火+160℃6 h时效热处理后显微组织和力学性能的影响.Cu,Ce元素对热处理态合金的强度、塑性影响显著.热处理态下,Ce含量一定时,添加3.4%~4.0%的 Cu 元素能使Al-7Si-0.35 Mg合金的断裂强度提高50%以上.添加3.6%~3.8%的 Cu 元素时,合金的抗拉强度超过了390 MPa；Ce 可以有效改善共晶硅的形态,提高合金的伸长率.当Cu含量一定时,添加0.15%的 Ce,Al-7Si-0.35Mg~3.6Cu 合金的伸长率从4.2%提高到7.4%.添加过量的Cu,Ce元素,合金中会生成针状的Al9 Ce2 Cu5 Si3四元相.实验结果表明, Al-7Si-0.35Mg合金中同时添加3.6% Cu 和0.15% Ce时,材料有良好的综合拉伸性能.
採用控製變量法,研究瞭 Cu,Ce 元素添加對 Al-7 Si-0.35 Mg 閤金鑄態及505℃10h固溶淬火+160℃6 h時效熱處理後顯微組織和力學性能的影響.Cu,Ce元素對熱處理態閤金的彊度、塑性影響顯著.熱處理態下,Ce含量一定時,添加3.4%~4.0%的 Cu 元素能使Al-7Si-0.35 Mg閤金的斷裂彊度提高50%以上.添加3.6%~3.8%的 Cu 元素時,閤金的抗拉彊度超過瞭390 MPa；Ce 可以有效改善共晶硅的形態,提高閤金的伸長率.噹Cu含量一定時,添加0.15%的 Ce,Al-7Si-0.35Mg~3.6Cu 閤金的伸長率從4.2%提高到7.4%.添加過量的Cu,Ce元素,閤金中會生成針狀的Al9 Ce2 Cu5 Si3四元相.實驗結果錶明, Al-7Si-0.35Mg閤金中同時添加3.6% Cu 和0.15% Ce時,材料有良好的綜閤拉伸性能.
채용공제변량법,연구료 Cu,Ce 원소첨가대 Al-7 Si-0.35 Mg 합금주태급505℃10h고용쉬화+160℃6 h시효열처리후현미조직화역학성능적영향.Cu,Ce원소대열처리태합금적강도、소성영향현저.열처리태하,Ce함량일정시,첨가3.4%~4.0%적 Cu 원소능사Al-7Si-0.35 Mg합금적단렬강도제고50%이상.첨가3.6%~3.8%적 Cu 원소시,합금적항랍강도초과료390 MPa；Ce 가이유효개선공정규적형태,제고합금적신장솔.당Cu함량일정시,첨가0.15%적 Ce,Al-7Si-0.35Mg~3.6Cu 합금적신장솔종4.2%제고도7.4%.첨가과량적Cu,Ce원소,합금중회생성침상적Al9 Ce2 Cu5 Si3사원상.실험결과표명, Al-7Si-0.35Mg합금중동시첨가3.6% Cu 화0.15% Ce시,재료유량호적종합랍신성능.
The influences of Cu and Ce on the microstructures and mechanical properties of Al-7Si-0. 35Mg alloys were investigated by using the control variables.The alloys underwent the same heat treat-ment:solution at 505 ℃ for ten hours.Then,the specimens were immediately cooled by water quenching. Finally,the samples were aged at 160 ℃ for 6 hours.The results have shown that Cu and Ce have a signif-icant influence on the improvement of the tensile strength and elongation of the heat treated alloys.After heat treatment,the tensile strength of Al-7Si-0.35Mg alloy can be increased by more than 50% with 3.4%~4.0% Cu,when the Ce content is certain.The tensile strengths of Al-7Si-0.35Mg alloys with 3.6% ~3.8% Cu increase above 390 MPa.Ce has an effective modification on the morphology of eutectic silicon. When the Cu content is certain,the elongations of alloys can be improved from 4.2% to 7.4% with 0.15%Ce.Adding excess Cu and Ce to Al-7Si-0.35Mg alloys,Al9 Ce2 Cu5 Si3 phases emerge.The results have il-lustrated that Al-7Si-0.35Mg alloys with 3.6% Cu and 0.15% Ce can attain good comprehensive tensile properties.
