Microstructure and Elevated Temperature Mechanical Properties of Sub-rapidly Solidified Mg-Zn-Sn-Al-Ca Alloys
The microstructure, elevated temperature tensile properties and creep resistance of seven kinds of sub-rapidly solidified Mg-Zn Sn-Al-Ca alloys are studied.The yield tensile strength (YTS), ultimate tensile strength (UTS) and elongation to rupture (ER) are measured by tensile testing at ambient temperature, 150 ℃ and 200 ℃ respectively.Compression creep tests are con ducted at 200 ℃ and under the compression stress of 55 MPa.As for the Mg-xZn-ySn-2Al-0.2Ca (x + y =9, with the Zn/Sn mass ratio of 2, 1 and 0.5) alloys, the highest UTS and YTS at RT are ob tained with the Zn/Sn mass ratio of 1.The YTS at 150 ℃ increases but the YTS at 200 ℃ decreases with the increasing Zn/Sn mass ratio.It is possibly ascribe to the elevated-temperature strengthening of Mg2 Sn particles since the alloy with the lower Zn/Sn mass ratio contains a higher amount of the Mg2Sn phase and a lower fraction of the Zn-con taining phases.As for the Mg-4.5Zn-4.5Sn-2Ai -zCa (z =0, 0.2, 0.4 and 0.6) alloys, the UTS and YTS at both RT and 200 ℃ exhibit the similar tendency with the Ca content.They increase at first and then decreased.The strength peaks occur in the alloys with 0.2 % Ca and 0.4 % Ca respectively.Both the initial strain and the steady creep rate de crease with the increasing Ca content in the range of 0-0.4 % Ca.Minor Ca addition can improve the RT and elevated temperature strength and enhance the compressive creep resistance of the Mg-4.5Zn -4.5Sn-2Al alloy, but reduce the elevated-tem perature plasticity.In addition, it also has an obvi ons influence on the tensile fracture mode, which changes from cleavage to quasi-cleavage at RT and from ductile to quasi-cleavage at 200 ℃ with the in creasing Ca addition.
Mg-Zn-Sn alloy Ca Microstructure Mechanical properties Creep
Juying Wei Jihua Chen Hongge Yan Bin Su Guanghao Zhang Xi He
School of Materials Science and Engineering,Hunan University,Changsha,P.R.China,410082
国际会议
The 12th China-Russia Symposium on Advanced Materials and Technologies(第十二届中俄双边新材料新工艺国际会议)
昆明
英文
542-550
2013-11-19（万方平台首次上网日期，不代表论文的发表时间）