摘要
利用XRD、SEM和DSC方法研究了AlFeCuCoNiCrTix(x=0、0.5、1)高熵合金退火态的微观组织、相结构以及相转变,同时利用洛氏硬度仪测量了各退火温度下的硬度变化。结果表明,随着退火温度的逐渐升高,Ti0合金的相组成大约在636℃以后会逐渐由原来的fcc+bcc结构变为fcc1+fcc2+bcc结构,其硬度在636℃会略微增加,在636～1112℃之间下降明显,在1112℃以后基本维持不变;对于Ti0.5合金,退火对其相组成基本没有影响,一直保持fcc+bcc1+bcc2的结构,其硬度在607℃会略微增加,在607～1092℃之间下降明显,在1092℃以后基本维持不变;而对于Ti1合金,当退火温度达到800℃时,会有Fe2Ti型的Laves相析出,这有助于提高材料的硬度,当退火温度达到1200℃时,其硬度可以提高到51.3HRC。
The microstructure, phase structure and phase transformation in the annealed AlFeCuCoNiCrTix high-entropy alloys are investigated by using XRD, SEM and DSC, and simultaneously, the hardness of the annealed alloys at different temperatures are measured by using Rockwell Apparatus. The result shows that, with increasing the annealing temperature, the phase composition of Ti0 alloy will transform from fcc＋ bcc to fccl ＋ fcc2 ＋ bcc at 636℃. Its hardness will increase slightly at 636℃, and decrease obviously at 636-1112℃, and keep invariant above 1112℃. However, at the same condition, Ti0. 5 alloy sustains the original structure of fcc＋bccl＋bcc2. Its hardness increases slightly when the annealing temperature is 607℃, decreases obviously with the temperature raising from 607℃ to 1092℃ ,and keep invariant with temperature above 1092℃. Regarding to the Til alloy, there is Laves phase precipitation of Fe2 Ti when the annealing temperature is higher than 800℃. This will help to enhance the hardness of the material and even the annealing temperature is up to 1200℃ the hardness of the Til alloy can also keep 51.3HRC.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2009年第12期51-54,共4页
Materials Reports
基金
桂科自(0647092)
广西信息材料重点实验室研究基金
