采用OM,SEM,TEM,XRD等手段,研究了不同状态的GWN751K镁合金的组织和性能.结果表明:铸态合金主要由基体和网状共晶组织构成,ab=215 MPa,σ0.2=187 MPa,δ=3.5%,DSC曲线存在明显的低熔点吸热峰;经过535℃,16 h热处理,共晶组织分解,晶界残留富Mg-Y相,晶粒尺寸明显长大,合金的力学性能有所改善,σb=240 MPa,σ0.2=189 MPa,δ=10%,DSC曲线低熔点吸热峰消失;合金经过挤压后,发生动态再结晶,力学性能显著提高,σb=320 MPa,σ0.2=260 MPa,δ=18%,最主要的原因是挤压后合金中存在高密度位错以及细小的晶粒,可显著提高合金的强度和塑性;经过时效后,合金的平均断裂强度达到400 MPa以上,但塑性明显降低.铸态合金二次裂纹主要存在于晶界的共晶组织中,535℃,16h热处理以及挤压后的合金二次裂纹主要是在晶粒内部.
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