CAJ | 학술논문

用 Al-3Cu-1Mg-2Fe-23Si 合金雾化粉末为原料，采用热压然后热挤压的方法制备 Al-3Cu-1Mg-2Fe-23Si过共晶铝合金，利用金相显微镜、扫描电镜、万能电子拉伸机等研究该合金的显微组织与力学性能。结果表明：热压坯体中存在大量孔隙，相对密度为91%，抗拉强度为70 MPa，硬度为35HRB；经热挤压后相对密度达到99%，颗粒状硅相均匀弥散分布在基体中，硬度提高到72 HRB；进一步热处理后颗粒状硅相消失，合金硬度为84 HRB，抗拉强度达到219 MPa，断裂方式为脆性断裂。
용 Al-3Cu-1Mg-2Fe-23Si 합금무화분말위원료，채용열압연후열제압적방법제비 Al-3Cu-1Mg-2Fe-23Si과공정려합금，이용금상현미경、소묘전경、만능전자랍신궤등연구해합금적현미조직여역학성능。결과표명：열압배체중존재대량공극，상대밀도위91%，항랍강도위70 MPa，경도위35HRB；경열제압후상대밀도체도99%，과립상규상균균미산분포재기체중，경도제고도72 HRB；진일보열처리후과립상규상소실，합금경도위84 HRB，항랍강도체도219 MPa，단렬방식위취성단렬。
The hypereutectic high-silicon aluminum alloy (Al-23Si) was fabricated by hot pressing and hot-extrusion process using Al-3Cu-1Mg-2Fe-23Si alloy atomized powder as raw material. Optical microscopy, scanning electron microscopy, universal material testing machine were used to study the microstructure and mechanical properties of Al-23Si alloy. Experimental results show that, there are still many holes exist after hot press process, and the tensile strength is 70 MPa. The density and hardness increase significantly after hot-extrusion process and the granular silicon appears and distributes in the matrix uniformly. The granular silicon phase disappears, the tensile strength reaches 219 MPa after heat treatment. The fracture mechanism is brittle fracture.