CAJ | 학술논문

对铝热法制备的添加质量分数为10％Cr的块体纳米晶Fe3Al材料进行600℃、800℃、1000℃的8h等温处理后,通过X射线衍射(XRD)、透射电子显微镜(TEM)和电子探针分析材料的晶体结构和平均晶粒尺寸.结果表明,等温处理前后,Fe3Al材料的晶体结构始终保持无序bee结构.材料的平均晶粒尺寸随退火温度的升高先增大后减小.等温处理前,材料的平均晶粒尺寸为21nm,经过600℃、800℃和1000℃等温处理后平均晶粒尺寸分别为31.7nm、27.3nm和24.6nm.通过弯曲和压缩实验研究了材料的机械性能.等温处理前后,材料均具有较大的塑性变形量.材料的屈服强度随等温处理温度的升高而略有增大,是传统微米晶Fe3Al材料的3倍左右.含10％Cr的Fe3Al材料经过8h的600℃、800℃和1000℃等温处理后,具有优异的热稳定性和更高的强度.
대려열법제비적첨가질량분수위10％Cr적괴체납미정Fe3Al재료진행600℃、800℃、1000℃적8h등온처리후,통과X사선연사(XRD)、투사전자현미경(TEM)화전자탐침분석재료적정체결구화평균정립척촌.결과표명,등온처리전후,Fe3Al재료적정체결구시종보지무서bee결구.재료적평균정립척촌수퇴화온도적승고선증대후감소.등온처리전,재료적평균정립척촌위21nm,경과600℃、800℃화1000℃등온처리후평균정립척촌분별위31.7nm、27.3nm화24.6nm.통과만곡화압축실험연구료재료적궤계성능.등온처리전후,재료균구유교대적소성변형량.재료적굴복강도수등온처리온도적승고이략유증대,시전통미미정Fe3Al재료적3배좌우.함10％Cr적Fe3Al재료경과8h적600℃、800℃화1000℃등온처리후,구유우이적열은정성화경고적강도.
Crystal structure and grain size of bulk nanocrystalline Fe3Al added with 10％ (mass fraction)Cr,after annealing at 600 ℃,800 ℃ and 1 000 ℃ for 8 h,were investigated by X-ray diffraction (XRD),transmission electron microscope (TEM) and electron probe microscope.Results show that the material had a disordered bee structure of Fe3Al,which did not change with temperature.Average grain size of the material increased first and then decreased with the rise of annealing temperature,which was 21 nm before annealing and 31.7 nm,27.3 nm and 24.6 nm,respectively,after annealing at 600 ℃,800 ℃ and 1 000 ℃.Mechanical properties were investigated by bending and compressive tests.It was indicated that the material both before and after annealing had a considerable plastic deformation.Yield strength of the material increased slightly with the increase of elevated temperature,which was about three times higher than that of traditional microcrystalli(n)e Fe3Al material.The material with 10％ (mass fraction) Cr after annealing at 600 ℃,800 ℃ and 1 000 ℃ for 8 h has good thermal stability and higher strength.