中文摘要：

利用拉伸试验和扫描电镜,研究了在150℃,挤压比对反向挤压ZA15锌合金的微观组织和力学性能的影响.结果表明：随着挤压比的增加,ZA15锌合金室温抗拉强度有所提高,但都在150 MPa以下.其伸长率在160%~180%,具有室温超塑性.这主要是由于均匀化后形成的（α＋η）片层共析组织经塑性变形后转变成以η相为基体,α相呈粒状弥散分布组织.这意味着采用低温常规挤压制备ZA15锌合金即可获得室温超塑性,同时,其力学性能也能够满足热喷涂ZA15锌合金线材的新标准要求.

英文摘要：

The effects of extrusion ratio on microstructures and mechanical properties of ZA15 Zn alloy extruded at 150 ℃ were investigated by microscopy and tensile test. The results showed that the tensile strength of the extruded ZA15 Zn alloy is improved with increasing of the extrusion ratio,but all are lower than 150 MPa. And the tensile elongation remains about 160% ~ 180%,which is the feature of room temperature superplasticity. This is mainly because the lamellar eutectoid microstructure composed of α ＋ η phases formed by heat treatment is transformed into one consisting of the η matrix and small α phase particle with dispersive distribution through plastic deformation. It implies that the room temperature superplasticity can be obtained in the ZA15 Zn alloy manufactured by the common extrusion at lower temperatures,and the mechanical properties can be satisfied with the newstandard of the ZA15 Zn alloy wire used to thermal spraying industry.