当前位置：首页 > 过刊浏览->2025年46卷第7期
Ti、Zr 微合金化对铸造Al-6Ni共晶合金组织和 力学性能的影响
Effect of Ti and Zr Microalloying on the As-cast Microstructure and Mechanical Properties of Al-6Ni Eutectic Alloy
浏览(29) 下载(1)
- DOI:
- 作者:
- 陈 吉1，陈 旭1，金 通1，毛有武2，蔡启舟1，蒋文明1
CHENJi1, CHEN Xu1, JIN Tong1, MAO Youwu2, CAI Qizhou1, JIANG Wenming1
- 作者单位:
- 1. 华中科技大学材料成形与模具技术全国重点实验室，湖北武汉430074；2.华中科技大学材料科学与工程国家级示 范教学中心，湖北武汉430074
1. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China; 2. National Experimental Teaching Demonstration Center of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
- 关键词:
- Al-6Ni 合金；Ti、Zr 微合金化；凝固过程；微观组织；力学性能
Al-6Ni alloy; Ti and Zr microalloying; solidification process; microstructure; mechanical properties
- 摘要:
- 研究了Ti、Zr微合金化对铸造Al-6Ni共晶合金凝固过程、微观组织和力学性能的影响。 结果表明，金属型 铸造Al-6Ni 共晶合金组织由初生α-Al相和(α-Al+Al3 Ni)共晶组成，随着 Ti、Zr 的添加，初生 α-Al 相的数量逐渐增加， 其晶粒尺寸逐渐减小。初生α-Al相依附于Ti、Zr化合物形核，形核过冷度减小、形核温度升高，添加(0.3%Ti+0.3%Zr，质 量分数)时，其形核温度由Al-6Ni 合金的 632 ℃升高至 638.5 ℃。 共晶凝固时间随Ti、Zr的添加而逐渐减少，但共晶 Al3 Ni 的形态和尺寸无明显变化，当Ti、Zr添加量较高时，共晶团边界形成了少量条状Al3 (Ti,Zr)相和块状Al3 Ni相。 添 加(0.2%Ti+0.2%Zr)时 Al-6Ni 合金的抗拉强度、屈服强度和伸长率分别为 140MPa、82MPa 和 26%，较 Al-6Ni 合金分别 提高了8%、25%和61%，其断口由撕裂棱、韧窝和少量解理面组成，以韧性断裂为主。The effects of Ti and Zr microalloying on the solidification process, microstructure, and mechanical properties of an as-cast Al-6Ni eutectic alloy were investigated. The results show that the microstructure of the Al-6Ni eutectic alloy cast in the permanent mold is composed of a primary α-Al phase and an (α-Al+Al3 Ni) eutectic. The primary α-Al phase nucleates on the compounds containing Ti and Zr, resulting in a decrease in undercooling and an increase in the nucleation temperature. When adding 0.3 wt.% Ti+0.3 wt.% Zr, the nucleation temperature of the Al-6Ni alloy increases from 632 ℃ to 638.5 ℃. The eutectic solidification time gradually decreases with the addition of Ti and Zr, but there is no significant change in the morphology or size of the eutectic Al3 Ni phase. When the amount of Ti and Zr added is relatively high, a small amount of strip-shaped Al3 (Ti, Zr) phase and blocky Al3 Ni phase are formed at the eutectic boundaries. The tensile strength, yield strength and elongation of the Al-6Ni alloy with the addition of 0.2 wt.% Ti+0.2 wt.% Zr are 140 MPa, 82 MPa and 26%, respectively, which are 8%, 25% and 61% greater than those of the Al-6Ni alloy. The fracture surface is composed of tear ridges, dimples and a small number of cleavage planes, with ductile fracture being the main type.