Ti含量对计算机材料Mg-Al-Zn合金微观组织与力学性能的影响

Effect of Ti Content on Microstructure and Mechanical Properties of Computer Material Mg-Al-Zn Alloy

以计算机材料Mg-Al-Zn合金为研究对象,对添加不同含量Ti元素的该合金热处理后的微观组织和力学性能进行分析,结果表明:Mg-Al-Zn合金微观组织主要由基体α-Mg相、网状β-(Mg17Al12)相,短小的针状相及微小共晶组织颗粒相组成,其中β-(Mg17Al12)相为主要的强化相,其形态和数理决定了合金的强度和硬度。随Ti元素含量增加,合金微观组织逐渐细化、均匀,晶粒数目越多,β相形态分布及尺寸、大小都发生了变化,合金的力学性能逐渐提高;在不同温度下,流变应力-应变曲线呈现走势基本相同的趋势,应力-应变曲线表现为明显的动态再结晶特性,随温度升高,该合金的峰值应力逐渐减小。

Taking computer material of Mg-Al-Zn alloy as research object,the microstructure and mechanical properties of the alloy with adding different quantity Ti in heat treatment were analyzed.The analysis results show that Mg-Al-Zn alloy microstructure are mainly composed of α-Mg matrix phase,reticular β-（Mg17Al12） phase,short and tiny acicular phase and eutectic microstructure particle phase.β-（Mg17Al12） was taken as the main strengthening phase,its shape and mathematical determine the strength and hardness of the alloy.With the increase of the content of Ti elements,the microstructure of the alloy becomes refinement,uniform,the more grain number,β phase distribution form and size have changed dramatically.The mechanical properties of the alloy increase gradually.At different temperatures,the rheological stress-strain curve shows the tendency of movements basic same.The stress-strain curves show the obvious dynamic recrystallization features,with temperature increasing,the peak stress of the alloy decreases.