TY - JOUR
T1 - EDM surface characteristics and shape recovery ability of Ti 35.5Ni48.5Zr16 and Ni60Al 24.5Fe15.5 ternary shape memory alloys
AU - Hsieh, S. F.
AU - Hsue, Albert W.J.
AU - Chen, S. L.
AU - Lin, M. H.
AU - Ou, K. L.
AU - Mao, P. L.
N1 - Funding Information:
The authors sincerely acknowledge the financial support of this research by the National Science Council (NSC), Republic of China , under Grant No. NSC 101-2221-E-151-009 .
PY - 2013/9/15
Y1 - 2013/9/15
N2 - Electro-discharge craters and recast materials are observed in the electro-discharge machining (EDM) surface of Ti35.5Ni 48.5Zr16 and Ni60Al24.5Fe 15.5 alloys. The recast layer is composed of TiO, NiO, ZrO 2, Fe2O3, Al2O3. The hardening effect near the outer surface for EDMed TiNiZr alloy originates from the surface oxides of the recast layer. The thickness of the recast layer increases upon growing pulse energy. The EDMed Ti35.5Ni 48.5Zr16 alloy still exhibits a good shape recovery, but the shape recovery is slightly reduced due to the depression of the recast layer. The material removal rate (MRR) of Ti35.5Ni 48.5Zr16 alloy is less than that of Ni60Al 24.5Fe15.5 alloy because of the larger θ × kα value. A high discharge energy should have a larger and deeper craters, and a rougher surface. The surface roughness of the EDMed TiNiZr and NiAlFe SMAs is found to obey the empirical equation of Ra = C(IP × τP)β. Having a larger θ × Kα value, Ti35.5Ni48.5Zr16 alloy has a lower Ra value than that of Ni60Al24.5Fe 15.5 alloy after electro-discharge machining.
AB - Electro-discharge craters and recast materials are observed in the electro-discharge machining (EDM) surface of Ti35.5Ni 48.5Zr16 and Ni60Al24.5Fe 15.5 alloys. The recast layer is composed of TiO, NiO, ZrO 2, Fe2O3, Al2O3. The hardening effect near the outer surface for EDMed TiNiZr alloy originates from the surface oxides of the recast layer. The thickness of the recast layer increases upon growing pulse energy. The EDMed Ti35.5Ni 48.5Zr16 alloy still exhibits a good shape recovery, but the shape recovery is slightly reduced due to the depression of the recast layer. The material removal rate (MRR) of Ti35.5Ni 48.5Zr16 alloy is less than that of Ni60Al 24.5Fe15.5 alloy because of the larger θ × kα value. A high discharge energy should have a larger and deeper craters, and a rougher surface. The surface roughness of the EDMed TiNiZr and NiAlFe SMAs is found to obey the empirical equation of Ra = C(IP × τP)β. Having a larger θ × Kα value, Ti35.5Ni48.5Zr16 alloy has a lower Ra value than that of Ni60Al24.5Fe 15.5 alloy after electro-discharge machining.
KW - Electro-discharge machining (EDM)
KW - Roughness
KW - TiNiZr shape memory alloys
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U2 - 10.1016/j.jallcom.2013.03.111
DO - 10.1016/j.jallcom.2013.03.111
M3 - Article
AN - SCOPUS:84877712801
SN - 0925-8388
VL - 571
SP - 63
EP - 68
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -