变形条件对SiC_P/AZ61复合材料力学行为的影响

Effect of Deformation Parameters on Mechanical Behavior of SiC_P/AZ61 Composite

利用Thermecmastor-Z热模机对6vol%SiC_p/AZ61复合材料初始态和半固态坯料进行压缩变形试验。分析了变形条件对真应力和微观组织的影响。研究表明:在相同应变速率下,随变形温度升高,该复合材料的真应力相应下降,峰值应力和稳态应力明显降低。与半固态复合材料坯料相比,在半固态温度区间(变形温度530℃)进行压缩,初始态复合材料的峰值应力达到17.6 MPa,约为半固态复合材料坯料的1.5倍;在高温固相压缩(变形温度400℃)时,初始态复合材料的峰值应力达75.4 MPa,晶粒局部呈纤维状,变形抗力较高。

The compression tests of 6vol%SiCp/AZ61 composite billets in initial state and semi-solid were carried out by using Thermecmastor-Z dynamic material testing machine. The effects of deformation condition on the true stress and microstructure were studied. The results show that the true stress of SiCp/AZ61 composite decreases, the peak stress and steady stress reduce significantly with the increase of deformation temperature at the same compressive strain rate. Compared with semi-solid billets of SiCp/AZ61 composite, the peak stress of initial states billets of SiCr/AZ61 composite reaches 17.6MPa, which is 1.5 times higher than that of semi-solid specimen during semi-solid temperature range （deformation temperature of 530℃ ） in compression test For compressing in solid state （deformation temperature of 400℃）, the peak stress of initial states billets of SiCp/AZ61 composite is 75.4 MPa, and the grain shows fibrous morphology in local, therefore, its deformation resistance is higher.