TY - JOUR
T1 - Fabrication and characterization of Fe-based amorphous coatings prepared by high-velocity arc spraying
AU - Guo, Wenmin
AU - Zhang, Jianfeng
AU - Wu, Yuping
AU - Hong, Sheng
AU - Qin, Yujiao
N1 - Funding Information:
The authors would like to acknowledge the financial supports from Fundamental Research Funds for the Central Universities ( 2013B34414 , 2013B22814 ), National Natural Science Foundation of China ( 50979028 ), Natural Key Foundation of Jiangsu Provience ( BK2011025 ) and National 973 Plan Project ( 2012CB719804 , 2015CB057803 ).
Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/8/5
Y1 - 2015/8/5
N2 - Fe-based coatings with a high amorphous content were firstly developed by the traditional twin wires arc spray technology. In consideration of empirical rules, including the multi-component system, an optimal concentration of small atoms, negative heat of mixing and an appropriate atom size mismatch among the main components, the cored wires were designed to contain eight elements, which have an optimized atomic volume strain criterion λn, in range of 0.14-0.21, to render the coatings a high glass forming ability. Then the coatings were prepared using the above-designed cored wires through a rapid arc spray melting and solidification process. Crystalline phases could not be identified from the XRD patterns within the XRD resolution limits, suggesting that the as-sprayed coatings were approximately comprised of fully amorphous phases. With a dense structure and a low porosity of only 2%, the amorphous Fe-based coatings exhibited an attractive combination of high hardness (900-1100HV0.3) and superior bonding strength (44.9-54.8MPa). The coating at λn=0.21 had the lowest Gibbs free energy difference δG, exhibited the largest super-cooled liquid region δTx, Lu's criterion factor γ value and the heat of crystallization (δH) values, which indicating the highest GFA.
AB - Fe-based coatings with a high amorphous content were firstly developed by the traditional twin wires arc spray technology. In consideration of empirical rules, including the multi-component system, an optimal concentration of small atoms, negative heat of mixing and an appropriate atom size mismatch among the main components, the cored wires were designed to contain eight elements, which have an optimized atomic volume strain criterion λn, in range of 0.14-0.21, to render the coatings a high glass forming ability. Then the coatings were prepared using the above-designed cored wires through a rapid arc spray melting and solidification process. Crystalline phases could not be identified from the XRD patterns within the XRD resolution limits, suggesting that the as-sprayed coatings were approximately comprised of fully amorphous phases. With a dense structure and a low porosity of only 2%, the amorphous Fe-based coatings exhibited an attractive combination of high hardness (900-1100HV0.3) and superior bonding strength (44.9-54.8MPa). The coating at λn=0.21 had the lowest Gibbs free energy difference δG, exhibited the largest super-cooled liquid region δTx, Lu's criterion factor γ value and the heat of crystallization (δH) values, which indicating the highest GFA.
KW - Amorphous
KW - Coating
KW - Crystallization
KW - Microstructure
KW - Thermal spray
UR - http://www.scopus.com/inward/record.url?scp=84929458873&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84929458873&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2015.04.027
DO - 10.1016/j.matdes.2015.04.027
M3 - Article
AN - SCOPUS:84929458873
SN - 0264-1275
VL - 78
SP - 118
EP - 124
JO - International Journal of Materials in Engineering Applications
JF - International Journal of Materials in Engineering Applications
ER -