中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2015年
1期
22-29
,共8页
黄正华%戚文军%徐静%蔡畅
黃正華%慼文軍%徐靜%蔡暢
황정화%척문군%서정%채창
耐热镁合金%Mg-Al-Sm合金%显微组织%力学性能%流动性能%断口形貌
耐熱鎂閤金%Mg-Al-Sm閤金%顯微組織%力學性能%流動性能%斷口形貌
내열미합금%Mg-Al-Sm합금%현미조직%역학성능%류동성능%단구형모
heat-resistant magnesium alloy%Mg-Al-Sm alloy%microstructure%mechanical property%flow property%fracture morphology
分析铸态和压铸态Mg?6.02Al?1.03Sm、Mg?6.05Al?0.98Sm?0.56Bi和Mg?5.95Al?1.01Sm?0.57Zn合金的显微组织和相组成，测试其拉伸力学性能与流动性能。结果表明，Mg?6.02Al?1.03Sm合金铸态组织由α-Mg基体、半连续的β-Mg17Al12相和高热稳定性的小块状 Al2Sm 相组成。添加 Bi 后生成杆状 Mg3Bi2相，而添加的 Zn固溶于α-Mg基体和β-Mg17Al12相中。铸态合金呈现优异的拉伸力学性能，室温时其抗拉强度(σb)和伸长率(δ)分别达到205~235 MPa和8.5%~16.0%，而423 K时分别超过160 MPa和14.0%。压铸态组织明显细化，第二相发生破碎，且弥散分布。压铸态合金呈现更高的拉伸力学性能和优异的流动性能，室温σb和δ分别达到240~285 MPa和8.5%~16.5%，流动长度可达1870~2420 mm。压铸态室温拉伸断口呈现明显的断裂特征。
分析鑄態和壓鑄態Mg?6.02Al?1.03Sm、Mg?6.05Al?0.98Sm?0.56Bi和Mg?5.95Al?1.01Sm?0.57Zn閤金的顯微組織和相組成，測試其拉伸力學性能與流動性能。結果錶明，Mg?6.02Al?1.03Sm閤金鑄態組織由α-Mg基體、半連續的β-Mg17Al12相和高熱穩定性的小塊狀 Al2Sm 相組成。添加 Bi 後生成桿狀 Mg3Bi2相，而添加的 Zn固溶于α-Mg基體和β-Mg17Al12相中。鑄態閤金呈現優異的拉伸力學性能，室溫時其抗拉彊度(σb)和伸長率(δ)分彆達到205~235 MPa和8.5%~16.0%，而423 K時分彆超過160 MPa和14.0%。壓鑄態組織明顯細化，第二相髮生破碎，且瀰散分佈。壓鑄態閤金呈現更高的拉伸力學性能和優異的流動性能，室溫σb和δ分彆達到240~285 MPa和8.5%~16.5%，流動長度可達1870~2420 mm。壓鑄態室溫拉伸斷口呈現明顯的斷裂特徵。
분석주태화압주태Mg?6.02Al?1.03Sm、Mg?6.05Al?0.98Sm?0.56Bi화Mg?5.95Al?1.01Sm?0.57Zn합금적현미조직화상조성，측시기랍신역학성능여류동성능。결과표명，Mg?6.02Al?1.03Sm합금주태조직유α-Mg기체、반련속적β-Mg17Al12상화고열은정성적소괴상 Al2Sm 상조성。첨가 Bi 후생성간상 Mg3Bi2상，이첨가적 Zn고용우α-Mg기체화β-Mg17Al12상중。주태합금정현우이적랍신역학성능，실온시기항랍강도(σb)화신장솔(δ)분별체도205~235 MPa화8.5%~16.0%，이423 K시분별초과160 MPa화14.0%。압주태조직명현세화，제이상발생파쇄，차미산분포。압주태합금정현경고적랍신역학성능화우이적류동성능，실온σb화δ분별체도240~285 MPa화8.5%~16.5%，류동장도가체1870~2420 mm。압주태실온랍신단구정현명현적단렬특정。
The microstructures and phase compositions of the as-cast and die-cast Mg?6.02Al?1.03Sm, Mg?6.05Al?0.98Sm?0.56Bi and Mg?5.95Al?1.01Sm?0.57Zn alloys were investigated. Meanwhile, the tensile mechanical and flow properties were tested. The results show that the as-cast microstructure of Mg?6.02Al?1.03Sm alloy is composed ofα-Mg matrix, discontinuousβ-Mg17Al12 phase and small block Al2Sm phase with high thermal stability. Rod Mg3Bi2 phase precipitates when Bi is added, while the added metal Zn dissolves intoα-Mg matrix andβ-Mg17Al12 phase. The as-cast alloys exhibit the excellent tensile mechanical property. The tensile strength (σb) and elongation (δ) can reach 205?235 MPa and 8.5%?16.0%at ambient temperature, respectively. Meanwhile, they can also exceed 160 MPa and 14.0%at 423 K, respectively. The die-cast microstructures are refined obviously, and meanwhile the broken second phases distribute dispersedly. The die-cast alloys exhibit better tensile mechanical properties with the values ofσb andδof 240?285 MPa and 8.5%?16.5%at ambient temperature, respectively, and excellent flow property with the flow length of 1870?2420 mm. The die-cast tensile fractures at ambient temperature exhibit a typical character of ductile fracture.
