铸造技术2025，Vol.46Issue(7)：665-672,8.DOI:10.16410/j.issn1000-8365.2025.5062
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
摘要
Abstract
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+Al3Ni)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 Al3Ni phase.When the amount of Ti and Zr added is relatively high,a small amount of strip-shaped Al3(Ti,Zr)phase and blocky Al3Ni 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.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Key words
Al-6Ni alloy/Ti and Zr microalloying/solidification process/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
陈吉,陈旭,金通,毛有武,蔡启舟,蒋文明..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[J].铸造技术,2025,46(7):665-672,8.基金项目
国家自然科学基金(52075198) （52075198）
