纳米晶Fe3Al材料的抗腐蚀性能和高温抗氧化性能

通过铝热反应熔化法制备纯纳米晶Fe3Al材料以及添加质量分数分别为10％Ni,10％Cr,10％ Mn,15％ Mo,5％ Cu和10％Cu合金元素的6种块体纳米晶Fe3Al材料；对含10％ Ni的纳米晶Fe3Al材料分别进行600 ℃、1000℃,8h的等温处理.采用质量损耗法测定不同纳米晶Fe3Al材料在质量分数为5％ H2SO4溶液中的均匀腐蚀速率；并研究各纳米晶Fe3Al材料在1200℃空气中的高温氧化性能.结果表明:添加15％Mo和添加10％Cu的纳米晶Fe3Al材料较纯纳米晶Fe3Al材料抗腐蚀性能提高明显;含10％ Ni的纳米晶Fe3Al材料经过600℃ 等温处理后的腐蚀速率略高于未等温处理的材料,而经1000℃等温处理后腐蚀速率明显下降；随着合金元素Ni、Mn、Cr、Cu的加入,纳米晶Fe3Al材料的氧化速度增大,抗氧化性能降低.

Corrosion resistance and high-temperature anti-oxidation property of bulk nanocrystalline Fe3Al based materials

Bulk nanocrystalline Fe3Al without and respectively with mass fraction of 10%Ni,10%Cr,10%Mn,15%Mo,5%Cu and 10%Cu elements were prepared by aluminothermic reaction.Fe3Al material containing 10%Ni was annealed at 600 ℃ and 1 000 ℃ for 8 h,respectively.The uniform corrosion rate was tested in 5 %(mass fraction) H2SO4 solution with mass losing method,and the oxidation behaviors of alloys were studied at 1 200 ℃ in air.The results show that the corrosion resistance of bulk nanocrystalline Fe3Al with 15%Mo and 10%Cu increases significantly compared to the pure nanocrystalline Fe3Al.The corrosion rate of bulk nanocrystalline Fe3Al with 10%Ni increases slightly after annealed at 600 ℃,while decreases after annealed at 1 000 ℃.After respectively adding the alloy elements of Ni,Cr,Mn,Cu,the oxidation rate of nanocrystalline Fe3Al materials increases and the anti-oxidation property decreases.