Hot cracking, crystal orientation and compressive strength of an equimolar CoCrFeMnNi high-entropy alloy printed by selective laser melting
Hot cracking, crystal orientation and compressive strength of an equimolar CoCrFeMnNi high-entropy alloy printed by selective laser melting
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选区激光熔化打印等摩尔CoCrFeMnNi高熵合金的热裂纹、晶体取向和抗压强度
DOI：
10.1016/j.optlastec.2020.106147
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发表时间：
2020-07-01
影响因子：
5
通讯作者：
Yuan, Tiechui
中科院分区：
文献类型：
--
作者：
Niu, Pengda;Li, Ruidi;Yuan, Tiechui
研究了等摩尔CoCrFeMnNi高熵合金（HEA）的激光选区熔化（SLM）打印热裂纹、晶粒尺寸、晶体取向和抗压强度。SLM打印的CoCrFeMnNi HEA无论采用何种打印参数都发生了热裂纹。随着体积能量密度（VED）的增加，打印样品的优选取向以->的顺序转变。此外，由于高温梯度和较大残余应力的存在，VED的增加有利于晶粒长大和晶粒取向扩展的增加。断裂强度随VED的增加而增加，最大抗压强度达到2447.7MPa，但由于显微组织的细化，伸长率仍有77.6%。研究结果对SLM法制备具有可控晶粒特性、晶体织构和复杂结构的HEA材料具有参考价值。
Hot cracking, grains size, crystal orientation and compressive strength of an equimolar CoCrFeMnNi high-entropy alloy (HEA) printed by selective laser melting (SLM) were investigated. The CoCrFeMnNi HEA printed by SLM suffered from hot cracking no matter of the employed printing parameters. The preferred orientation of the printed sample was transformed in the order: ->->->, as the volumetric energy density (VED) rises. Also, the increased VED favors the grain growth and the increase of the grain orientation spread, owing to the presence of high temperature gradient and larger residual stress. The fracture strength increases with the VED, and the maximum compressive strength rises to 2447.7 MPa, but the elongation rate is still 77.6% due to the ultrafine microstructure. The results of this study have reference value for the preparation of HEA materials with controllable grain characteristics, crystalline texture and complex structures by SLM.