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Microstructural and mechanical properties of ZA10 alloy tubes and their weld seams prepared by conform continuous extrusion

引用

Rare Metals 2020年第6期39卷 707-715页

作者： Gao-Yong Lin Meng-Qiong Xiao Di Feng Xin-Yi Liu Hong-Yang Wang Rui Zhang School of Materials Science and Engineering Central South UniversityChangsha 410083China Key Lab of Nonferrous Materials Ministry of EducationCentral South UniversityChangsha 410083China Department of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

In the present work,Zn-10 Al-2 Cu-0.05 Ti(ZA10)alloy tubes with a diameter of 12.5 mm and wall thickness of 1.2 mm were fabricated by one-pass and double-pass conform continuous extrusion.A stabilizing heat treatment[350℃,30 min(furnace cooling)+120℃,12 h(air cooling)]was also applied to some of the double-pass tubes to improve the quality of their weld *** yield strength,ultimate tensile strength,elongation and expansion ratio of the one-pass continuous extrusion tube were 268.4 MPa,294.3 MPa,13.8%and 5.5%,***-pass continuous extrusion improved these values to 278.4 MPa,317.2 MPa,15.4%and 11.4%,***-pass tubes also had fewer aggregations of Al-αprecipitates along the welding seam,which improved seam quality and caused cracks to appear in the matrix,away from the weld-affected zone,during expansion ***-treated double-pass tubes exhibited superior yield strength(283.9 MPa)and ultimate tensile strength(328.5 MPa)but lower elongation(10.2%)and expansion ratios(10.3%).Additionally,the heat-treated tubes exhibited markedly lower elongation at room temperature due to the remarkable blockage of dislocation motions by fine-scale lamellar(α+η)eutectoid structures and a lower size effect when stretched.

关键词： ZAl0 alloy tube conform continuous extrusion Weld seam Stabilizing heat treatment

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