搅拌摩擦加工Fe_(40)Mn_(20)Co_(20)Cr_(15)Si_5高熵合金微观组织和拉伸性能  

Microstructure and tensile properties of Fe_(40)Mn_(20)Co_(20)Cr_(15)Si_(5) high-entropy alloy prepared by friction stir processing

作　　者：向亚婷 王文 刘艺 韩鹏 林佳 王快社 XIANG Ya-ting;WANG Wen;LIU Yi;HAN Peng;LIN Jia;WANG Kuai-she(National and Local Joint Engineering Research Center for Functional Materials Processing,School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院功能材料加工国家地方联合工程研究中心,陕西西安710055

出　　处：《塑性工程学报》2025年第3期261-267,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金优秀青年科学基金资助项目(52222410);陕西省杰出青年科学基金资助项目(2022JC-24)。

摘　　要：通过搅拌摩擦加工(FSP)技术制备了具有细晶组织的Fe_(40)Mn_(20)Co_(20)Cr_(15)Si_(5)高熵合金(CS-HEA),研究了细晶CS-HEA的微观组织和拉伸性能,并将其与铸态CS-HEA的微观组织和拉伸性能进行了对比。结果表明,与铸态CS-HEA相比,FSP后,细晶CS-HEA的微观组织致密均匀,平均晶粒尺寸细化至3.1μm,同时FCC相比例提高至96%。细晶CS-HEA的屈服强度、抗拉强度和伸长率相比于铸态CS-HEA分别提高了194%、188%和195%,分别从179 MPa、496 MPa和19%提高至347 MPa、930 MPa和37%。这归因于FSP后CS-HEA的晶粒显著细化以及CS-HEA中高比例的FCC相在拉伸过程中发生了FCC→HCP相变,拉伸变形后FCC相比例从96%降低至53%,诱发了相变诱发塑性效应,持续为变形提供加工硬化。The fine-grained Fe_(40)Mn_(20)Co_(20)Cr_(15)Si_(5) high-entropy alloy(CS-HEA)was prepared by friction stir processing(FSP)technolo-gy.The microstructure and tensile properties of fine-grained CS-HEA were studied and compared with those of the as-cast CS-HEA.The results show that the microstructure of fine-grained CS-HEA is denser and more homogeneous than that of as-cast CS-HEA,and the aver-age grain size of the fine-grained CS-HEA is refined to 3.1μm.The proportion of FCC phase increases to 96%.Compared with as-cast CS-HEA,the yield strength,ultimate tensile strength and elongation of fine-grained CS-HEA are increased by 194%,188%and 195%,rising from 179 MPa,496 MPa and 19%to 347 MPa,930 MPa and 37%,respectively.The improvement of tensile properties is attribu-ted to the combined effects of grain refinement of CS-HEA,combined with the FCC HCP transformation occuring within the high-pro-portion FCC phase of CS-HEA during tensile.After tensile deformation,the proportion of FCC phase decreases from 96%to 53%,which induces the transformation induced plasticity effect,providing continuous work hardening for deformation.

关 键 词：搅拌摩擦加工 高熵合金 相变诱发塑性 微观组织 拉伸性能 

分 类 号：TB31[一般工业技术—材料科学与工程]