CAJ | 학술논문

研究了在Al?7Si?0．35Mg合金中添加Cu、Ce元素后，热处理工艺对合金显微组织和力学性能的影响。实验结果表明，较优的热处理工艺为505℃保温12 h，淬火后160℃保温10 h。热处理后，共晶硅相从铸态的不规则板条状、针尖状及粗大块状变为尺寸细小的长条状、球状；合金布氏硬度提高了72％；抗拉强度为393 MPa，伸长率为7．4％，分别提高了80％与68％；合金的断裂方式从脆性断裂转变为准解理断裂。
연구료재Al?7Si?0．35Mg합금중첨가Cu、Ce원소후，열처리공예대합금현미조직화역학성능적영향。실험결과표명，교우적열처리공예위505℃보온12 h，쉬화후160℃보온10 h。열처리후，공정규상종주태적불규칙판조상、침첨상급조대괴상변위척촌세소적장조상、구상；합금포씨경도제고료72％；항랍강도위393 MPa，신장솔위7．4％，분별제고료80％여68％；합금적단렬방식종취성단렬전변위준해리단렬。
The influences of heat treatment on microstructures and mechanical properties of Al?7Si?0. 35Mg?3. 6Cu?0.15Ce alloys were studied after Cu and Ce were added into Al?7Si?0.35Mg alloy. The results show that the optimal heat treatment process conditions are as follows:holding at 505℃ for 12 hours, and at 160℃ for 10 hours after quenching. After heat treatment, the morphology of eutectic silicon changes from as?cast irregular plate strip, acicular shape and rough block to tiny strip and spherical particle. The Brinell hardness of the as?treated alloy can be increased by more than 72%. The tensile strength and elongation of the alloy are 393 MPa and 7.4% respectively, increased by 80% and 68% respectively. The fracture mode changes from brittle fracture to quasi?cleavage fracture.