论文部分内容阅读
采用X射线衍射、金相显微镜、扫描电镜、能谱分析及拉伸性能测试等方法,研究3种成分Al-Cu-Ce合金的显微组织与力学性能。结果表明:铸态Al-14Cu-7Ce合金由α-Al+Al8CeCu4片状共晶组成,而Al-10Cu-5Ce、Al-18Cu-9Ce合金中除含有α-Al+Al8CeCu4共晶组织外,还分别含有α-Al和Al8CeCu4初生相。铸态Al-14Cu-7Ce合金具有优良耐热性能,即使550℃×3 h退火后仍能保持约360 MPa的抗拉强度,退火导致合金强度下降的主要原因是高温下共晶Al8CeCu4相的球化。经充分球化退火后,Al-Cu-Ce合金能获得良好的热轧、冷轧变形能力,并且变形态合金也具有良好的耐热性能,因而Al-Cu-Ce合金有望成为一种兼具铸造和变形两用的新型耐热铝合金。
The microstructure and mechanical properties of Al-Cu-Ce alloy with three compositions were investigated by X-ray diffraction, optical microscope, scanning electron microscopy, energy dispersive spectroscopy and tensile test. The results show that the as-cast Al-14Cu-7Ce alloy consists of α-Al + Al8CeCu4 lamellar eutectic, while the Al-10Cu-5Ce and Al-18Cu-9Ce alloys contain α-Al + Al8CeCu4 eutectic Respectively, containing α-Al and Al8CeCu4 primary phase. The as-cast Al-14Cu-7Ce alloy has excellent heat resistance, and retains a tensile strength of about 360 MPa even after annealing at 550 ℃ for 3 h. The main reason for the decrease in strength of the alloy due to annealing is that the ball of the eutectic Al8CeCu4 phase The After fully spheroidizing and annealing, the Al-Cu-Ce alloy can obtain good hot rolling and cold rolling deformation ability, and the deformed alloy also has good heat resistance, so that the Al-Cu-Ce alloy is expected to be a Casting and deformation of dual-use heat-resistant aluminum alloy.