Numerical and Experimental Analysis of the Deformation Behavior of CoCrFeNiMn High Entropy Alloy Particles onto Various Substrates During Cold Spraying
Numerical and Experimental Analysis of the Deformation Behavior of CoCrFeNiMn High Entropy Alloy Particles onto Various Substrates During Cold Spraying
复制标题
DOI：
10.1007/s11666-022-01377-1
复制
发表时间：
2022-04-08
影响因子：
3.1
通讯作者：
Hussain, T.
中科院分区：
文献类型：
--
作者：
Akisin, C. J.;Bennett, C. J.;Hussain, T.
冷喷涂中金属材料的结合机理主要是高应变率下的绝热剪切不稳定性（ASI），而高熵合金（HEAs）在各种基体上的冲击变形行为尚未得到广泛研究。HEAs具有优异的应变硬化能力和高抗剪切局部化能力，这会影响其冷喷涂过程中的结合机制。在这项研究中，单粒子冲击行为在冷喷涂CoCrFeNiMn到工业纯铝（CP Al），铝合金（Al 6082），不锈钢（SS 304），和钛合金（Ti6 Al 4V）基板进行了实验和数值分析。冲击形貌显示了HEA颗粒、SS 304和Ti6 Al 4V基材中的ASI。HEA/SS 304对显示出比HEA/Ti6 Al 4V更高的临界速度，这是由于与SS 304相比，Ti6 Al 4V的密度和热导率更低。在CP Al和Al 6082衬底上观察到机械联锁，并且归因于衬底的局部变形。经验公式表明，这是由颗粒密度和基板硬度的影响。这项工作严格评估，并提供了一个更好的理解HEA颗粒基板变形行为，扩大其适用范围更广的基板。
The bonding mechanisms of a wide range of metallic materials in cold spraying have been studied, mainly attributed to adiabatic shear instability (ASI) at high strain rates, whereas the impact and deformation behavior of high entropy alloys (HEAs) onto various substrates has not been widely explored. HEAs have been characterized by excellent strain-hardening ability and high resistance to shear localization, which can influence their bonding mechanism during cold spray. In this study, experimental and numerical analyses of single-particle impact behavior during cold spraying of CoCrFeNiMn onto commercially pure aluminum (CP Al), aluminum alloy (Al6082), stainless steel (SS304), and titanium alloy (Ti6Al4V) substrates were carried out. The impact morphology revealed ASI in the HEA particle, and SS304 and Ti6Al4V substrates. The HEA/SS304 pair showed a higher critical velocity compared to HEA/Ti6Al4V due to the lower density and thermal conductivity of Ti6Al4V compared to SS304. Mechanical interlocking was observed on CP Al and Al6082 substrates and was attributed to the localized deformation of the substrates. An empirical equation showed this is influenced by the particle density and substrate hardness. This work critically evaluates and provides a better understanding of HEA particle-substrates deformation behavior, expanding its applicability to a wider range of substrates.