论文部分内容阅读
研究添加Al-5Ti-1B-RE细化剂对Al-7.0Si-0.55Mg(A357)合金的显微组织和力学性能的影响。先利用真空熔炼技术制备Al-7.0Si-0.55Mg合金,然后在Al-7.0Si-0.55Mg合金中加入不同成分的Al-5Ti-1B-RE中间合金。通过X射线衍射仪(XRD)、金相显微镜(OM)和扫描电子显微镜(SEM)对显微组织和拉伸试样的断口形貌进行观察。在室温下对合金的力学性能进行测试。观察Al-5Ti-1B-RE细化剂的形态以及内部结构,可以发现以TiB2为异质形核核心的TiAl3/Ti2Al20RE的壳层结构相。在Al-7.0Si-0.55Mg合金中加入Al-5Ti-1B-3.0RE细化剂后,抗拉强度会有明显提升,直到0.2%添加量时,抗拉强度会达到峰值。
The effect of adding Al-5Ti-1B-RE refiner on the microstructure and mechanical properties of Al-7.0Si-0.55Mg (A357) alloy was studied. Al-7.0Si-0.55Mg alloy was prepared by vacuum smelting technique and then Al-5Ti-1B-RE master alloy with different composition was added to Al-7.0Si-0.55Mg alloy. The fracture morphology of the microstructures and tensile specimens was observed by X-ray diffraction (XRD), optical microscope (OM) and scanning electron microscopy (SEM). The mechanical properties of the alloy were tested at room temperature. Observing the morphology and internal structure of Al-5Ti-1B-RE refiner, the shell structure phase of TiAl3 / Ti2Al20RE with heterogeneous nuclei of TiB2 can be found out. After Al-5Ti-1B-3.0RE refiner was added into Al-7.0Si-0.55Mg alloy, the tensile strength of the Al-7.0Si-0.55Mg alloy increased obviously. When the content of Al-5SiB-3.0RE was 0.2%, the tensile strength peaked.