CAJ | 학술논문

采用金相观察、力学性能测试、电子探针（EPMA）等手段，分析添加B2O3对Al?6．5Si?0．5Mg合金力学性能以及微观组织产生的影响，并对细化机制进行了研究。结果表明：在合金中添加B2O3较Al?3．8B中间合金有更好的细化效果，添加量同为0．06％时，前者较后者抗拉强度（σb）和延伸率（δ）分别提升5．54％和30．7％。当添加0．1％的B2O3时，合金σb 和δ进一步提升至213．5 MPa和8．76％。合金组织形态得到显著改善，α?Al基体的细化机制为硅相附着于AlB2后的核壳结构能够成为Al基体的形核核心。 Fe相形态的改善则与B2 O3能间接影响其均匀化析出有关，另一方面也可能与形成难熔富铁相的沉降有关。
채용금상관찰、역학성능측시、전자탐침（EPMA）등수단，분석첨가B2O3대Al?6．5Si?0．5Mg합금역학성능이급미관조직산생적영향，병대세화궤제진행료연구。결과표명：재합금중첨가B2O3교Al?3．8B중간합금유경호적세화효과，첨가량동위0．06％시，전자교후자항랍강도（σb）화연신솔（δ）분별제승5．54％화30．7％。당첨가0．1％적B2O3시，합금σb 화δ진일보제승지213．5 MPa화8．76％。합금조직형태득도현저개선，α?Al기체적세화궤제위규상부착우AlB2후적핵각결구능구성위Al기체적형핵핵심。 Fe상형태적개선칙여B2 O3능간접영향기균균화석출유관，령일방면야가능여형성난용부철상적침강유관。
The effect of B2O3 addition on microstructures and tensile properties of Al?6.5Si?0.5Mg alloy was investigated with optical microscopy, tension test, electron probe microanalysis (EPMA). The results show that adding 0.06% of B2 O3 , compared to the same amount of B in the form of Al?3.8B, can lead to the tensile strength (σb ) and ductility (δ) of Al?6.5Si?0.5Mg alloy increased by 5.54% and 30.7%, respectively. If the addition of B2 O3 increases to 0.1%, theσb and δ will increase to 213.5 MPa and 8.76%. It is found that the structure of Al?6.5Si?0.5Mg alloy has been remarkably improved, and refinement mechanism is that silicon phase attached to the Al?AlB2 shell structure forms nucleation of Al substrate. The morphology change of Fe phase has something to do with B2 O3 that can indirectly bring influence on its homogeneous precipitation, or may be attributed by the sedimentation of infusible Fe?rich compounds.