Effect of Aging Treatment on Microstructural Evolution and Mechanical Properties of Submerged Friction Stir Processed WE43 Alloy [时效热处理对水下搅拌摩擦加工WE43镁合金的微观组织及力学性能的影响]

作者：Cao G.^*; Liu Y.; Zhang D.; Zheng Z.

来源：Rare Metal Materials and Engineering, 2018, 47(10): 3179-3184.

• Aging treatment
• Friction stir processing
• Mechanical property
• Microstructure
• WE43 alloy

The as-cast WE43 alloy was subjected to submerged friction stir processing (SFSP). The effects of aging treatment on the microstructural evolution and mechanical properties of SFSP specimens were investigated. The results show that the microstructure of the cast WE43 alloy is significantly refined and the mechanical properties are greatly enhanced by SFSP. After the subsequent artificial aging treatment at 150℃ for 66 h and 180℃ for 54 h, the strengths of the peak-aged specimens further increase, which is attributed to the large quantity of β'' and β1 precipitates, respectively. Meanwhile, elongations of the peak-aged specimens are both decreased since more crack nucleation sites are provided with the increasing precipitates. The failure mechanism of SFSP specimen is ductile fracture, while that of the peak-aged specimens is mixed ductile-brittle fracture. ? 2018, Science Press. All right reserved.

• 单位
  华南理工大学