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Friction-stir welding of a ductile high entropy alloy: microstructural evolution and weld strength
Materials Science and Engineering: A ( IF 6.1 ) Pub Date : 2017-11-16 , DOI: 10.1016/j.msea.2017.11.058
Z.G. Zhu , Y.F. Sun , F.L. Ng , M.H. Goh , P.K. Liaw , H. Fujii , Q.B. Nguyen , Y. Xu , C.H. Shek , S.M.L. Nai , J. Wei

High entropy alloys (HEAs) are a novel subset of metallic systems with complex compositions usually yielding simple phase formation. To verify their potential engineering applications, a novel Co16Fe28Ni28Cr28 HEA with a low content of expensive Co was developed and its welding characteristics through friction-stir welding (FSW) were investigated. The HEA shows a stable face-centered-cubic (FCC) structure with an excellent ductility of about 70%. The microstructural evolution during FSW was dominated by discontinuous recrystallization through grain bulging and the B/B¯ {112}<110> shear texture formed in the stir zone (SZ). A white band (WB) containing W-rich and Cr-rich phases was detected in the SZ. The WB exhibited refined grains compared with the normal SZ, which may be associated with the particle-stimulated nucleation (PSN). The present understanding of the microstructural evolution during FSW of HEAs may help tailor the weld properties to pave the way for their engineering applications.



中文翻译:

延性高熵合金的摩擦搅拌焊接:组织演变和焊接强度

高熵合金(HEA)是金属系统的一个新子集,具有复杂的成分,通常会形成简单的相。为了验证其潜在的工程应用,开发了一种新型的Co 16 Fe 28 Ni 28 Cr 28 HEA,该合金具有低廉的昂贵Co含量,并研究了其通过搅拌摩擦焊(FSW)的焊接特性。HEA显示稳定的面心立方(FCC)结构,具有约70%的出色延展性。FSW期间的微观组织演变主要是由于晶粒凸起和B /¯{112} <110>在搅拌区(SZ)中形成的剪切织构。在SZ中检测到包含W和Cr富集的白带(WB)。与正常的SZ相比,WB显示出细化的晶粒,这可能与颗粒刺激形核(PSN)有关。目前对HEA的FSW过程中微观结构演变的了解可能有助于定制焊接性能,为其工程应用铺平道路。

更新日期:2017-11-16
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