摘要
采用热压和粉末包套挤压方法制备7050和7050/Gr材料,测试力学性能和内耗性能,利用金相显微镜和透射电镜观察材料组织。结果表明:通过热压制备的7050/Gr复合材料力学性能很低;粉末包套挤压制备的7050/Gr复合材料随Gr含量提高,7050/Gr的强度、弹性模量下降,伸长率也降低;热处理后复合材料的强度大幅度提高,T6态时强度最高,7050/4Gr、7050/5Gr的抗拉强度和伸长率分别为535 MPa、9.5%和526 MPa、3.5%;内耗测试结果表明,7050/5Gr复合材料的内耗比7050合金的内耗高,它们的内耗值均随测试频率降低和测试温度升高而增加,7050/5Gr复合材料的内耗属动滞后型的复相型阻尼合金的内耗机制。
7050 and 7050/Gr composites were prepared by hot-press and powder-extrusion, their mechanical properties and interual-friction properties were tested, the microstructures were observed by OM and TEM. The results show that the mechanical properties of 7050/Gr composite prepared by hot-press are much worse than that prepared by powder-extrusion. For 7050/Gr composite prepared by powder-extrusion, with volume of Gr increasing, the strength, the modulus, and the plasticity decrease. Heat treatment can greatly improve the strength of 7050/Gr, T6 treated can get the highest strength. Strength and elongation of 7050/4Gr, 7050/5Gr composites are as followings respectively： 535 MPa, 9.5% and 526 MPa, 3.5%. As for internal-friction, value of 7050/5Gr is much higher than that of 7050 alloy, the internal-friction value of both materials increases with frequency decreasing and temperature increasing. Meanwhile, internal-friction mechanism of 7050/5Gr can be classified as dynamic relaxation of multi-phase internal-friction.
出处
《兵器材料科学与工程》
CAS
CSCD
2009年第3期37-41,共5页
Ordnance Material Science and Engineering
