| Title |
Mechanical Properties of Discontinuous Precipitated Al-Zn Alloys after Drawing at Room and Cryogenic Temperatures |
| Authors |
김민수(Min Soo Kim); 한승전(Seung Zeon Han); 이재현(Jehyun Lee); 임성환(Sung Hwan Lim); 안지혁(Jee Hyuk Ahn); 김상식(Kwang Ho Kim); 김광호 |
| DOI |
https://doi.org/10.3365/KJMM.2017.55.2.77 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Al-Zn alloys; continuous precipitation; mechanical property; microstructure; discontinuous precipitation |
| Abstract |
In order to study the effect of microstructural change on the tensile properties of discontinuous precipitated Al-Zn binary alloy, four different Al-Zn alloys(25, 30, 35, 45 wt% Zn) were aged at 160 ℃ for different aging times(0, 5, 15, 30, 60, 120, 360 min) after being solution treated at 400 ℃, and successively drawn at room and cryogenic temperatures(-197 ℃). Discontinuous precipitation was formed during aging in the Al matrix(which contained more than 30 wt% Zn) in Al alloys containing more than 30 wt% Zn. The tensile strength of continuous precipitated Al-35Zn alloy decreased with increasing drawing ratio, however, the tensile strength of discontinuous precipitated Al-35Zn alloy increased with further drawing. The strength and ductility combination, 350 MPa-36% was achieved by drawning discontinuous precipitated Al-Zn alloy at room temperature. The discontinuous precipitated Al-Zn alloy drawn at cryogenic temperature showed a higher value of tensile strength, over 500 MPa, although ductility decreased. †(Received July 22, 2016; Accepted August 16, 2016) |