【摘 要】
：
研究具有纳米晶的Al-10wt.％Fe-5wt.％Cr块体合金的热稳定性.采用机械合金化(MA)方法对初始微晶粒混合粉末进行100 h的球磨,得到纳米晶粒合金粉末,然后用高频感应加热烧结法(HFIH
【机 构】
：
Engineering Management Department, College of Engineering, Prince Sultan University, Riyadh, KSAMech
论文部分内容阅读
研究具有纳米晶的Al-10wt.％Fe-5wt.％Cr块体合金的热稳定性.采用机械合金化(MA)方法对初始微晶粒混合粉末进行100 h的球磨,得到纳米晶粒合金粉末,然后用高频感应加热烧结法(HFIHS)烧结成块体材料.采用X射线衍射分析(XRD)、场发射扫描电镜(EFSEM)和高分辨透射电镜(HRTEM)对合金粉末样品和块体样品的显微结构进行表征.对块体样品进行显微硬度和压缩试验,以评价其力学性能.为评价块体试样的热稳定性,分别在573、623、673和723 K下进行压缩试验,应变速率为1×10-1和1×10-2 s-1.与烧结态合金相比,退火后的试样其显微硬度值显著提高,在723 K退火后显微硬度值为2.65 GPa,而烧结态的为2.25 GPa.当应变速率为1×10-1s-1时,块体合金在300和723 K下的抗压强度分别为520和450MPa.块体合金的显微结构稳定性归因于与铝形成的如Al6Fe、Al13Fe4和Al13Cr2等含Fe和Cr相以及铝基体中含Cr和Fe的过饱和固溶体.
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