Aiming to investigate the effects of nano β-tricalcium phosphate (β-TCP) on the hot deformation mechanism of Mg-Zn-Zr alloy (MZZ) and confirm the optimum hot working conditions of 2β-TCP/Mg-3Zn-0.8Zr composites (MZZT), thermal simulation test at deformation temperature and strain rate in the range of 523–673 K and 0.001–1 s⁻¹ was performed on MZZ and MZZT by using Gleeble-1500 simulator. The results of strain-stress behavior indicated that the flow stress of MZZT is higher than that of MZZ under the same hot deformation condition in the deformation temperature range of 523–623 K, whereas this trend opposed when specimens deformed at 673 K. Based on the establishment of constitutive equation, the average activation energy of MZZT for hot deformation is calculated to be 184.1 kJ/mol, and almost 60 kJ/mol higher than that of MZZ which can be attributed to the increasing of deformation resistance after the addition of β-TCP particles. Furthermore, according to the processing map constructed at strains of 0.8 and microstructure observation, the optimum hot working condition for MZZT with higher value of power dissipation (37%) is determined to be 600–645 K and 0.01–0.001 s⁻¹.

目的研究纳米β-磷酸三钙（β-TCP）对Mg-Zn-Zr合金（MZZ）热变形机理的影响，并确定2β-TCP/ Mg-3Zn-0.8Zr复合材料的最佳热加工条件（MZZT），在变形温度和应变率在523–673 K和0.001–1 s ^-1范围内的热模拟测试使用Gleeble-1500模拟器在MZZ和MZZT上执行。应变-应力行为的结果表明，在523-623 K的变形温度范围内，在相同的热变形条件下，MZZT的流动应力要高于MZZ，而当试样在673 K变形时，这种趋势相反。建立本构方程，计算得出MZZT热变形的平均活化能为184.1 kJ / mol，比MZZ高约60 kJ / mol，这可归因于加入β后抗变形能力的提高。 -TCP粒子。此外，根据在0.8应变下构造的加工图和显微组织观察，确定具有较高功耗（37％）的MZZT的最佳热加工条件为600–645 K和0.01–0.001 s^-1。