高浓度氧化铝弥散强化铜合金的高温力学行为（英文）

发布时间：2018-07-20 12:54

【摘要】：研究Cu-2.7%Al2O3弥散强化铜合金的微观组织及其高温力学行为。结果表明:细小的Al2O3粒子均匀分布在铜基体当中,部分粗大的Al2O3粒子分布在晶界上。拉伸试验表明Hall-Petch机制是影响氧化铝弥散强化铜合金室温屈服强度的主要因素,其高温强度主要由于Al2O3粒子对晶界和亚晶界与位错的强烈钉扎作用。合金在700°C下的抗拉强度和屈服强度分别达到237 MPa和226 MPa。拉伸断口表明弥散强化铜合金显示出高温脆性。蠕变测试表明400°C下的稳态蠕变速率比700°C下的稳态蠕变速率小很多,其400°C和700°C的蠕变应力指数分别为7和5,蠕变机制为位错核心扩散型和晶格扩散型蠕变。
[Abstract]:The microstructure and high temperature mechanical behavior of Cu-2.7Al _ 2O _ 3 dispersion strengthened copper alloy were studied. The results show that the fine Al _ 2O _ 3 particles are uniformly distributed in the copper matrix and some of the coarse Al _ 2O _ 3 particles are distributed on the grain boundaries. The tensile test shows that the Hall-Petch mechanism is the main factor affecting the room temperature yield strength of alumina dispersion strengthened copper alloy, and the high temperature strength is mainly due to the strong pinning of Al 2O 3 particles to grain boundaries and sub-grain boundaries and dislocations. The tensile strength and yield strength of the alloy at 700 掳C are 237 MPA and 226 MPA, respectively. Tensile fracture shows that dispersion strengthened copper alloy shows high temperature brittleness. The creep tests show that the steady creep rate at 400 掳C is much smaller than that at 700 掳C. the creep stress exponents of 400 掳C and 700 掳C are 7 and 5 respectively. The creep mechanism is dislocation core diffusion type and lattice diffusion type creep.
【作者单位】：中南大学材料科学与工程学院;中南大学粉末冶金国家重点实验室;
【基金】：Project(51271203)supported by the National Natural Science Foundation of China the PPP project between the CSC(China Scholarship Council)and the DAAD(German Academic Exchange Service) Project(11JJ2025)supported by Hunan Provincial Natural Science Foundation of China Project(YSZN2013CL06)supported by the Nonferrous Metals Science Foundation of HNG-CSU Project supported by the Aid program for Science Technology Innovative Research Team in Higher Educational Institutions of Hunan Province,China
【分类号】：TG146.11;TB333

【参考文献】