標題: Mechanical behavior and electrochemical stability of gas-nitrided FeMnAlC alloy in simulated body fluid
作者: Hsueh, Shun-Jen
Huang, Jhen-Yi
Chao, Chuen-Guang
Juang, Jenh-Yih
Liu, Tzeng-Feng
材料科學與工程學系
電子物理學系
Department of Materials Science and Engineering
Department of Electrophysics
關鍵字: Metals and alloys;Metallurgy;Corrosion;Simulated body fluid
公開日期: 1-Apr-2018
摘要: The mechanical performance and electrochemical stability in simulated body fluid (SBF) of a lightweight Fe-30Mn-10Al-1C (in wt.%) alloy after gas nitridation were investigated. The gas nitriding process was performed at 550 degrees C for 5 h under pure NH3 atmosphere. The nitrided layer was similar to 45 mu-thick and consisted predominantly of fine AlN. The surface microhardness, ultimate tensile strength, yield strength, and elongation of the present gas-nitrided alloy are 1814 Hv, 1078 MPa, 1024 MPa, and 77%, respectively. The corrosion tests in SBF showed that the gas-nitrided alloy exhibited a corrosion current density (I-corr) of 5.0 x 10(-9) A/cm(2), a pitting corrosion current density (I-pit) of 5.1 x 10(-7) A/cm(2), and a passivation region with Delta E (equivalent to E-p - E-corr) approximate to + 1804 mV, respectively, which are substantially better than those obtained in the plasma-nitrided and hydroxyapatite-coated 316L stainless steel. The results demonstrated that the present gas-nitrided alloy having an excellent combination of strength, ductility and corrosion resistance is a promising candidate to replace 316L stainless steel for medical implants. (C) 2018 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.matlet.2018.01.019
http://hdl.handle.net/11536/144499
ISSN: 0167-577X
DOI: 10.1016/j.matlet.2018.01.019
期刊: MATERIALS LETTERS
Volume: 216
起始頁: 150
結束頁: 153
Appears in Collections:Articles