摘要
以ZL114A合金为研究对象,探讨了Cu合金化对ZL114A微观组织和力学性能的影响。结果表明,在ZL114A合金中Cu加入量小于0.1%时,合金组织和性能无明显变化,此时Cu完全固溶在基体中。随着Cu加入量增加,合金抗拉强度呈先迅速升高再稍微下降趋势,伸长率则一直降低。在Cu加入量为0.5%时,ZL114A合金的抗拉强度达到最大值337.21 MPa,伸长率降低至3.4%。Cu含量高于0.1%(超过基体固溶极限)时,时效会析出W(Al2Mg5Si4Cu4)相,W相弥散分布在基体中,形成第二相强化,提高合金强度、降低塑性。析出第二相过程中铝基体会产生晶格畸变,提高合金的强度。
The effects of copper on the microstructure and mechanical properties of ZL114 Aaluminum alloy were investigated by optical microscope,scanning electron microscope and tensile testing experiment.The results reveal that there exist changes-absent in the microstructure or the mechanical properties with copper content less than 0.1%,which indicates that the copper is completely soluted in the matrix.As the increasing in Cu content,the tensile strength of the alloy is increased fast firstly and then declined slightly while the elongation is decreased.With the Cu content of 0.5%,the tensile strength and elongation of the alloy reach 337.21 MPa and 3.4%,respectively.Furthermore,the EDS data verifies that the improvement mechanisms of alloy is attributed to dispersed precipitation of the second phase W（Al2Mg5Si4Cu4）to form second phase strengthening effects with the content of Cu exceeding 0.1%（the limit of the matrix solid solubility）,and there exists also lattice distortion being generated as the second phase to improve the tensile strength of the ZL114 Aaluminum alloy.
作者
刘伟国
龙文元
王东成
Liu Weiguo Long Wenyuan Wang Dongcheng(College of Aeronautical Manufacturing Engineering, Nanchang Hangkong University Jiangling Foundry, Jiangling Motors Co. Group)
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2017年第9期1006-1009,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51165036)
