(北京航空材料研究院 二室, 北京 100095)
摘 要: 研究了高强铝合金的力学性能与Zr含量的关系, 计算了合金的各种强化因素值。研究发现: 合金的抗拉强度σb和屈服强度σ0.2均随Zr含量的增加而增大, 增幅分别达到11.8%和12.6%; 合金延伸率δ在Zr添加量不高时随Zr含量的增加而增大, 在Zr含量为0.06%时出现峰值, 随后合金延伸率/δ/逐渐稳定在8%左右。 结合合金显微特征, 合金强化机理主要包括晶粒细化、 颗粒弥散强化及形变强化, 在Zr含量为0.16%的合金中相应的强化值分别为21, 35和14MPa。
关键字: 锆; 高强铝合金;力学性能; 强化机理
(The second department, Beijing Institute of Aeronautical Materials,
Beijing 100095, China)
Abstract:The relationship between Zr content and mechanical properties of high strength aluminum alloys was examined, and the strengthening values of several factors were calculated. The values of σb and σ0.2 are improved with increasing of Zr content, and the improving amplitude reach to 11.8% and 12.6% respectively. The elongation δ increases with increasing Zr content while Zr content is low, and reaches a peak at 0.06%Zr, then gradually stabilizes at about 8% Zr. Combined with microstructure of alloys, strengthening mechanism are mainly grain-refine, particles dispersion strengthening and improvement of deformation strengthening. The strengthening values of 0.16%Zr alloy is 21, 35, and 14MPa, respectively.
Key words: zirconium; high strength aluminum alloys; mechanical properties; strengthening mechanism