Hits:

Indexed by:期刊论文

Date of Publication:2010-07-01

Journal:TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA

Included Journals:SCIE、EI、ISTIC

Volume:20

Issue:SUPPL. 2

Page Number:S357-S360

ISSN No.:1003-6326

Key Words:Mg-Zn-Cu-Zr alloy; yttrium; microstructure; mechanical property

Abstract:The effects of yttrium addition on microstructure and mechanical properties of as-cast Mg-6Zn-3Cu-0.6Zr-xY (x=0, 0.5, 1.0, 1.5 and 2.0, mass fraction, %) (ZCK630+xY for short in this study) alloys were investigated by means of OM, XRD and SEM. The results show that the average grain size of Mg-Zn-Cu-Zr magnesium alloy is effectively reduced (from 57 mu m to 39 mu m) by Y addition. The analysis of XRD indicates the existence of I-phase (Mg(3)Zn(6)Y) and W-phase (Mg(3)Zn(3)Y(2)) in ZCK630 alloys with Y addition. The ultimate tensile strength of ZCK630 alloys is significantly deteriorated with increasing Y addition, which is possibly related to the continuous networks of intergranular phases and the increase of W-phase.