中国有色金属学报
中國有色金屬學報
중국유색금속학보
The Chinese Journal of Nonferrous Metals
2015年
10期
2649-2655
,共7页
黄正华%刘汪涵博%戚文军%徐静
黃正華%劉汪涵博%慼文軍%徐靜
황정화%류왕함박%척문군%서정
AZ91D合金%Sm变质%显微组织%拉伸力学性能%冲击韧性
AZ91D閤金%Sm變質%顯微組織%拉伸力學性能%遲擊韌性
AZ91D합금%Sm변질%현미조직%랍신역학성능%충격인성
AZ91D alloy%Sm modification%microstructure%tensile mechanical property%impact toughness
利用光学显微镜、扫描电子显微镜和X射线衍射仪分析铸态和固溶态AZ91D-xSm(x=0~1)合金的组织和相组成,测试其室温拉伸力学性能和冲击韧性。结果表明:随着Sm含量的增加,铸态组织中不连续网状β-Mg17Al12相发生破碎,数量逐渐减少,而小块状高热稳定性新相Al2Sm数量逐渐增多;拉伸力学性能和冲击韧性整体均逐渐提高,AZ91D-0.88Sm合金的抗拉强度σb、伸长率δ和冲击韧性αnK分别达到230 MPa、15.5%和24 J/cm2;经固溶处理后,β-Mg17Al12相完全固溶于α-Mg基体中,只存在Al2Sm相;拉伸力学性能和冲击韧性均明显提高,但其提高幅度随着Sm含量的增加而有所减缓。
利用光學顯微鏡、掃描電子顯微鏡和X射線衍射儀分析鑄態和固溶態AZ91D-xSm(x=0~1)閤金的組織和相組成,測試其室溫拉伸力學性能和遲擊韌性。結果錶明:隨著Sm含量的增加,鑄態組織中不連續網狀β-Mg17Al12相髮生破碎,數量逐漸減少,而小塊狀高熱穩定性新相Al2Sm數量逐漸增多;拉伸力學性能和遲擊韌性整體均逐漸提高,AZ91D-0.88Sm閤金的抗拉彊度σb、伸長率δ和遲擊韌性αnK分彆達到230 MPa、15.5%和24 J/cm2;經固溶處理後,β-Mg17Al12相完全固溶于α-Mg基體中,隻存在Al2Sm相;拉伸力學性能和遲擊韌性均明顯提高,但其提高幅度隨著Sm含量的增加而有所減緩。
이용광학현미경、소묘전자현미경화X사선연사의분석주태화고용태AZ91D-xSm(x=0~1)합금적조직화상조성,측시기실온랍신역학성능화충격인성。결과표명:수착Sm함량적증가,주태조직중불련속망상β-Mg17Al12상발생파쇄,수량축점감소,이소괴상고열은정성신상Al2Sm수량축점증다;랍신역학성능화충격인성정체균축점제고,AZ91D-0.88Sm합금적항랍강도σb、신장솔δ화충격인성αnK분별체도230 MPa、15.5%화24 J/cm2;경고용처리후,β-Mg17Al12상완전고용우α-Mg기체중,지존재Al2Sm상;랍신역학성능화충격인성균명현제고,단기제고폭도수착Sm함량적증가이유소감완。
The microstructures and phase compositions of as-cast and solution-treated AZ91D-xSm (x=0?1) alloys were investigated by optical microscopy, scanning electron microscopy and X-ray diffractometry. Meanwhile, the tensile mechanical property and impact toughness at ambient temperature were tested. The results show that the discontinuous network β-Mg17Al12 phase breaks and decreases gradually among the as-cast microstructure with increasing the Sm content. Meanwhile, small block Al2Sm new phase with high thermal stability increases gradually. The tensile mechanical property and impact toughness on the whole are enhanced gradually. Tensile strength σb, elongation δ and impact toughness αnK of AZ91D-0.88Sm alloy reach 230 MPa, 15.5% and 24 J/cm2, respectively. After solution treatment,β-Mg17Al12 phase dissolves intoα-Mg matrix completely and Al2Sm phase still exists. The tensile mechanical property and impact toughness are enhanced obviously and the improving amplitude decreases slightly with increasing the Sm content.