冷却速率对ADC12合金凝固组织与性能的影响  

Effects of Cooling Rate on Solidification Structure and Performance of ADC12 Alloy

作　　者：程煜刚 李俊琛[1] 郑道友[2] 赵葵 钱琦嘉 王文权[4] 王坤[2] CHENG Yugang;LI Junchen;ZHENG Daoyou;ZHAO Kui;QIAN Qijia;WANG Wenquan;WANG Kun(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050;Zhejiang Vocational and Technical College of Industry and Trade,Wenzhou 325026;Wenzhou Ruiming Industrial Co.,Ltd.,Wenzhou 325000;School of Materials Science and Engineering,Jilin University,Changchun 130051)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]浙江工贸职业技术学院,温州325026 [3]温州瑞明工业股份有限公司,温州325000 [4]吉林大学材料科学与工程学院,长春130051

出　　处：《特种铸造及有色合金》2025年第1期59-64,共6页Special Casting & Nonferrous Alloys

基　　金：温州市重大科技创新攻关资助项目(ZG2022035,ZG2023005)。

摘　　要：通过定向凝固试验研究了冷却速度对ADC12铝合金凝固组织演变及力学性能的影响。结果表明,随着冷却速率增加,ADC12铝合金组织的枝晶间距呈减小趋势且晶粒取向趋于一致,当冷却速率≥1.5℃/s时,枝晶间距减小趋势明显减缓。冷却速率为15.5℃/s时,横截面枝晶臂间距为18.28μm,纵截面枝晶臂间距为18.14μm。晶粒细化有助于提升合金的力学性能和硬度,冷却速率为15.5℃/s时,ADC12铝合金的抗拉强度、伸长率和显微硬度(HV)分别达到280.89 MPa、1.76%和98.35。SEM结果显示,ADC12铝合金断口随着枝晶间距减小由脆性断裂向韧性/脆性混合断裂转变,合金断口韧窝增多。Effects of cooling rate on solidification structure evolution and mechanical properties of ADC12 aluminum alloy were investigated through directional solidification experiments.The results indicate that as the cooling rate increases,the dendrite spacing of ADC12 aluminum alloy shows a downward trend and the grain orientation tends to be consistent.When the cooling rate is≥1.5℃/s,the downward trend slows down significantly.With the cooling rate of 15.5℃/s,the distance between dendrite arms in the cross and longitudinal section is 18.28 and 18.14μm,respectively.Grain refinement is helpful to improving the mechanical properties and hardness of alloy,where the tensile strength,elongation and microhardness of ADC12 aluminum alloy reach 280.89 MPa,1.76%and 98.35 HV,respectively.SEM results reveal that the fracture surface of ADC12 aluminum alloy is transformed from brittle fracture to ductile/brittle mixed fracture as the dendrite spacing decreases,and the amounts of dimples on the fracture are increased.

关 键 词：定向凝固 冷却速率 ADC12铝合金 枝晶 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]