熔体氢含量对Al-Cu合金热裂行为的影响  

Effect of Melt Hydrogen Content on Hot Tearing Behavior of Al-Cu Alloys

作　　者：高中堂 余德锋 高志明 卢佳炜 于源[2] 张传伟[1] Gao Zhongtang;Yu Defeng;Gao Zhiming;Lu Jiawei;Yu Yuan;Zhang Chuanwei(School of Mechanical Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《稀有金属材料与工程》2023年第6期2039-2047,共9页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51804251,52104384);Science Fund of Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing(AMGM2021F04);Planning Project of Xi’an Science and Technology(21XJZZ0041);China Postdoctoral Science Foundation(2020M683675XB);NSF of Shaanxi Provincial Department of Education(21JK0761);Key Research and Development Program of Shaanxi(2023-YBGY-343)。

摘　　要：Al-Cu合金具有较宽的凝固间隔,并且由于供给不足容易出现热裂和气孔缺陷。采用约束棒铸造(CRC)模具研究了氢含量对Al-xCu合金热裂敏感性(HTS)的影响。通过分析熔体中不同氢含量的Al-xCu合金的热裂敏感性值、断裂形态和微观结构,研究了孔隙形成对热裂行为的影响。结果表明,随着熔体氢含量的增加,合金在凝固后期由于晶粒粗化和液相供给不足,热裂敏感性明显增加。提出了一种基于孔隙率的热裂形成机制,以解释孔隙率和热裂之间的相互作用。Al-Cu alloy with wide solidification interval is prone to hot tearing and porosity defects due to insufficient feeding.The effect of hydrogen content on the hot tearing susceptibility(HTS)of Al-xCu alloy was investigated by the constrained rod casting(CRC)mold.Based on analysis of the HTS value,fracture morphology and the microstructure of Al-xCu alloy with different hydrogen contents in the melt,the influence of porosity formation on the hot tearing was analyzed.The results show that the hot tearing susceptibility of the alloy is evidently aggravated,which is caused by grain coarsening and insufficient feeding of liquid phase in the late stage of solidification with the increase in melt hydrogen content.A porosity-based formation mechanism of hot tearing is proposed to explain the interplay between porosity and hot tearing.

关 键 词：AL-CU合金 含氢量 热裂敏感性 铸造 孔隙 

分 类 号：TG146.21[一般工业技术—材料科学与工程]