中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2013年
12期
3275-3281
,共7页
Mg-Gd-Y-Zr合金%热轧%微观组织%力学性能
Mg-Gd-Y-Zr閤金%熱軋%微觀組織%力學性能
Mg-Gd-Y-Zr합금%열알%미관조직%역학성능
Mg-Gd-Y-Zr alloy%hot rolling%microstructure%mechanical properties
Mg-10Gd-4.8Y-0.6Zr铸态合金经525℃、16 h均匀化退火后,在500℃轧制成总变形量为84%的板材,轧制后在200℃进行时效处理。观察合金的微观组织变化,并测试合金的力学性能。结果表明:轧制变形明显细化了晶粒尺寸,轧制后组织中存在方块相和长条状相;轧制初期组织中存在大量孪晶,孪晶能很好地协调塑性变形,并诱发了孪生动态再结晶;随着轧制变形量的增大,孪晶数量减少,再结晶方式以晶界弓出形核为主。轧制T5态合金具有优异的高温力学性能,200、250、300和350℃时抗拉强度分别为392、381、251和112 MPa,350℃拉伸时伸长率达到107.0%。
Mg-10Gd-4.8Y-0.6Zr鑄態閤金經525℃、16 h均勻化退火後,在500℃軋製成總變形量為84%的闆材,軋製後在200℃進行時效處理。觀察閤金的微觀組織變化,併測試閤金的力學性能。結果錶明:軋製變形明顯細化瞭晶粒呎吋,軋製後組織中存在方塊相和長條狀相;軋製初期組織中存在大量孿晶,孿晶能很好地協調塑性變形,併誘髮瞭孿生動態再結晶;隨著軋製變形量的增大,孿晶數量減少,再結晶方式以晶界弓齣形覈為主。軋製T5態閤金具有優異的高溫力學性能,200、250、300和350℃時抗拉彊度分彆為392、381、251和112 MPa,350℃拉伸時伸長率達到107.0%。
Mg-10Gd-4.8Y-0.6Zr주태합금경525℃、16 h균균화퇴화후,재500℃알제성총변형량위84%적판재,알제후재200℃진행시효처리。관찰합금적미관조직변화,병측시합금적역학성능。결과표명:알제변형명현세화료정립척촌,알제후조직중존재방괴상화장조상상;알제초기조직중존재대량련정,련정능흔호지협조소성변형,병유발료련생동태재결정;수착알제변형량적증대,련정수량감소,재결정방식이정계궁출형핵위주。알제T5태합금구유우이적고온역학성능,200、250、300화350℃시항랍강도분별위392、381、251화112 MPa,350℃랍신시신장솔체도107.0%。
The as-cast Mg-10Gd-4.8Y-0.6Zr alloy sheets were rolled at 500 ℃ with 84% total reduction after being homogenized at 525 ℃ for 16 h and then aged at 200 ℃. The microstructures and mechanical properties were investigated. The results show that the grain size can be effectively refined by rolling process, cuboid-shaped phases and strip-shaped phases exist after being rolled. A mass of twins exist after initially being rolled, they can harmonize the plastic deformation and cause twinning-induced DRX. The number of twins decreases with the increase of rolling reduction and the DRX mode turns into grain boundary bulging mechanism. The rolled-T5 alloy has excellent elevated temperature mechanical properties: the tensile strength at 200, 250, 300 and 350 ℃ are 392, 381, 251 and 112 MPa, respectively, and the elongation at 350℃can reach 107.0%.