摘要
通过分级淬火法测定了高真空压铸AlSi10MgMn合金的时间-温度-转化率(TTT)和时间-温度-性能(TTP)曲线,利用淬火因子分析法(QFA)预测了合金的力学性能,验证了该方法的准确性;采用透射电子显微镜(TEM)研究了等温淬火和时效过程中合金微观组织的演变规律。结果表明:合金TTT和TTP曲线的鼻尖温度约为370℃,淬火敏感区间为295~445℃;根据淬火因子分析法,合金的临界冷却速率为7.7℃/s,但在冷却速率较小时,该方法误差较大;合金在等温过程中产生了棒状β-Mg_(2)Si相,且随着等温时间的延长,β-Mg_(2)Si尺寸变大且数量增多,导致时效后得到的纳米相β?相减少,无析出带(PFZ)范围增大。
The time-temperature-transformation(TTT)and time-temperature-property(TTP)curves of high vacuum die casting(HVDC)AlSi10MgMn alloy were determined by interrupted quench factor analysis method.The mechanical properties of the alloy were predicted by quench factor analysis(QFA),the accuracy of which was verified with different quench conditions.The microstructure evolution during isothermal quenching and ageing treatment was studied by transmission electron microscopy(TEM).The results show that the nose temperature of TTT and TTP curves is about 370℃with the quenching sensitivity range of 295−445℃.According to the QFA results,the critical cooling rate of the alloy is 7.7℃/s,but the accuracy of QFA decreases at very low cooling rate.In addition,the rod-shapedβ-Mg_(2)Si phases precipitate during the isothermal process and grow up with the extension of holding time,which reduces the density of the fine age-induced precipitatesβʺphase and increases the range of precipitation free zone(PFZ)after the followed aging treatment.
作者
雷月琴
赵海东
王雪灵
马万里
LEI Yue-qin;ZHAO Hai-dong;WANG Xue-ling;MA Wan-li(School of Mechanical and Automotive Engineering,National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2023年第9期2839-2849,共11页
The Chinese Journal of Nonferrous Metals
基金
北京市自然科学基金-小米创新联合基金资助项目(L223001)
广东省重点领域研发计划资助项目(2020B010186002)
佛山市核心技术攻关项目(1920001001040)。
