AZ91镁合金铸态组织晶界处存在粗大的网状Mg17Al12相以及凝固过程中产生的成分偏析，严重影响了铸锭的力学性能和成形加工性能。为改善其成形性能，对铁模铸造试样进行了均匀化退火处理，退火温度范围为350~450℃，退火时间范围为5~24h。均匀化退火后Mg17Al12相呈细小的颗粒状分布在α-Mg基体上，枝晶偏析大部分得到消除。力学性能试验结果表明，铸态AZ91镁合金的抗拉强度约为163MPa，延伸率为3.2%；经过380℃15h均匀化，可获得最高延伸率达11.2%，抗拉强度达到243MPa；经过420℃5h均匀化，可获得最高强度达246MPa，延伸率可达10%。
There are reticular coarse Mg17Al12 and component segregation generated during solidification on grain boundary of AZ91 magnesium alloy as cast, which deteriorate the mechanical properties and the workability of ingots severely. In order to improve the workability, homogenizing treatment is researched. The homogenizing temperature is 350, 380, 420, 450℃ and the holding time is 5, 10, 15, 24h. After homogenizing treatment, the Mg17Al12 phase is scattered on the α-Mg matrix as fine grains, and dendritic segregation is eliminated almost. It is concluded from the mechanical properties test that the tensile strength of the AZ91 on the condition of as-cast, homogenized at 380℃15h and 420℃5h is about 163MPa, 243MPa and 246MPa, while the elongation is about 3.2%, 11.2% and 10%.
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