通过与常规铸造方法的比较,研究半固态触变挤压对ZA27合金变质、热处理组织和力学性能的影响.结果表明:半固态挤压态合金的密度较铸态合金提高了3%,合金经Sc变质或者半固态挤压都获得了细小而均匀的近似球状组织,而Sc变质结合半固态挤压的球状组织具有最高的圆整度;经T6热处理的半固态挤压合金由细小的初生α相和共析(α+η)组织组成,说明半固态挤压可促进ε相溶解、减少三元共晶(β+η+ε)组织的含量.力学性能测试表明,ZA27合金经半固态挤压+Sc变质+T6热处理后其抗拉强度,伸长率和布氏硬度分别达到586.01MPa,17.57%及171HB.
Through comparative study with normal casting, the effects of semi-solid thixo-extrusion on microstructures and mechanical properties with modification treatment and heat treatment of ZA27 alloys were studied.The results show that the density of semi-solid thixo-extrusion ZA27 alloy increases by 3% compared to the one obtained by normal casting, fine spherical uniform microstructure is obtained by Sc modification treatment or semi-solid thixo-extrusion, and the best roundness of the globular grains is obtained by Sc modification combined with semi-solid thixo-extrusion.The microstructure of ZA27 alloy by semi-solid thixo-extrusion combined with T6 heat treatment is composed of small α primary phase and (α+η) eutectoid phase, which shows that semi-solid thixo-extrusion can promote the dissolution of ε phase and reduce (β+η+ε) ternary eutectic content.The mechanical properties test indicates that the tensile strength, elongation and Brinell hardness of the ZA27 alloy by semi-solid thixo-extrusion, and after Sc modification and T6 heat treatment, are up to 586.01MPa, 17.57% and 171HB respectively.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%