TY - JOUR
T1 - Ductile quasicrystalline alloys
AU - Inoue, A.
AU - Zhang, T.
AU - Chen, M. W.
AU - Sakurai, T.
AU - Saida, J.
AU - Matsushita, M.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2000/2/21
Y1 - 2000/2/21
N2 - An icosahedral (I) quasicrystalline phase with a grain size below 40 nm was formed as a metastable phase in crystallization of the bulk glassy Zr65Al7.5CU17.5-xNi10Mx (M=Ag, Pd, Au, or Pt; x=5 and 10 at %) alloys. The volume fraction (Vf) of the I phase is about 85% for the 5% M alloy and nearly 100% for the 10% M alloy. The I phase changes to Zr2Cu+Zr2Ni+ Zr2Al3 in a fully annealed state. Compressive fracture strength (σc,f) and fracture elongation (∈εc,f) of the 10% Pd cylinder with a diameter of 2 mm are respectively 1640 MPa and 2.2% for the glassy phase and increase to 1830 MPa and 3.1% for the I phase. The increase in σc,f is due to the suppression effect of the I particles against the shear deformation of the intergranular glassy phase, and the increase in εc,f results from the localization effect of deformation into the glassy layer. The precipitation of the I phase implies that the glassy alloys include randomly oriented I configurations. The present work shows promise for the new class of high-strength nanoquasicrystalline materials.
AB - An icosahedral (I) quasicrystalline phase with a grain size below 40 nm was formed as a metastable phase in crystallization of the bulk glassy Zr65Al7.5CU17.5-xNi10Mx (M=Ag, Pd, Au, or Pt; x=5 and 10 at %) alloys. The volume fraction (Vf) of the I phase is about 85% for the 5% M alloy and nearly 100% for the 10% M alloy. The I phase changes to Zr2Cu+Zr2Ni+ Zr2Al3 in a fully annealed state. Compressive fracture strength (σc,f) and fracture elongation (∈εc,f) of the 10% Pd cylinder with a diameter of 2 mm are respectively 1640 MPa and 2.2% for the glassy phase and increase to 1830 MPa and 3.1% for the I phase. The increase in σc,f is due to the suppression effect of the I particles against the shear deformation of the intergranular glassy phase, and the increase in εc,f results from the localization effect of deformation into the glassy layer. The precipitation of the I phase implies that the glassy alloys include randomly oriented I configurations. The present work shows promise for the new class of high-strength nanoquasicrystalline materials.
UR - http://www.scopus.com/inward/record.url?scp=0001469321&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0001469321&partnerID=8YFLogxK
U2 - 10.1063/1.125907
DO - 10.1063/1.125907
M3 - Article
AN - SCOPUS:0001469321
VL - 76
SP - 967
EP - 969
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 8
ER -