摘要
采用快速凝固（RS）、往复挤压（RE）和正挤压（EX）制备了具有细晶组织的合金丝。丝材的成分为Mg-6.0%Zn-1.0%Y-0.6%Ce-0.6%Zr,直径为Φ2.08 mm~Φ1.50 mm。在前期SEM和STEM分析组织、弯曲极限能力研究基础上,对Φ1.60 mm丝材进行了不同工艺的热处理研究,然后用Instron 5500R试验机分析了丝材的拉伸、弯曲和曲直性能。研究表明,选用300℃保温10 m in,然后水淬T4处理工艺,丝抗拉强度和延伸率分别为402 MPa和12%。在弯曲直径为~6.28 mm情况下,最大弯曲压下速度Vb-m ax为4 mm.m in-1,弯曲压力为59 N,曲直时拉力为59 N。而T6处理后,可以获得高强度和高塑性结合的丝材。实验表明,350℃保温3 h水淬＋150℃保温1 d,是最好的T6工艺。处理后,丝材的σb为448 MPa,δ为7.5%。最大弯曲压下速度Vb-m ax为6 mm.m in-1,弯曲压力为52 N,曲直拉力为50 N。
The high surface quality magnesium wires with composition of Mg-6.0%Zn-1.0%Y-0.6%Ce-0.6%Zr and different diameters between Φ2.08 mm and Φ1.50 mm were prepared using combinatorial processes of rapid solidification（RS）,reciprocating extrusion（RE） and forward extrusion（EX）.Based on our previous microstructure research conclusions by SEM and STEM,and the critical bending test results,the wire with a diameter of Φ1.60 mm was heated with different processes.Moreover,the heat treated wires were undergone bending and straightening tests on an Instron 5500R mechanical property equipment.After a T4 process（holding at 300 ℃ for 10 min,and then quenching in water）,the ultimate tensile strength and elongation of the wire were 402 MPa and 12%,respectively.With a bending diameter of 6.28 mm,the wire could be bended to parallel with a maximum press downward speed（Vb-max） of 4 mm · min-1 and a press force about 59 N.This bending wire could be straightened afterward under a uniform straightening speed of 1 mm · min-1.During straightening the tensile force was about 59 N.After T6 heat treatment,the wire had the best comprehensive mechanical properties.When the wire was held at 350 ℃ for 3 h and quenched in water,then held at 150 ℃ for 1 d,its ultimate tensile strength and elongation were 448 MPa and 7.5%,respectively.During bending,its Vb-max was about 6 mm · min-1,and press force was 52 N.During straightening,the straightening force was about 50 N.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2011年第3期259-265,共7页
Journal of the Chinese Society of Rare Earths
基金
教育部博士点基金(20070700003)
河南省科技攻关项目(102102210031)
河南省教育厅自然科学项目(2010A430008)资助
关键词
往复挤压
快速凝固
镁合金
丝材
机械性能
稀土
reciprocating extrusion
magnesium alloy
wire
mechanical property
rare earths
