低温下TiZrHf系高熵合金的动态压缩力学特性与点火行为
Dynamic Compressive Mechanical Properties and Ignition Behavior of TiZrHf-based High-entropy Alloys at Low Temperatures
车明月 1常孟周 1范飞高 1陈闯 1唐恩凌 1郭凯 1贺丽萍1
作者信息
- 1. 沈阳理工大学 辽宁省瞬态物理力学与能量转换材料重点实验室, 辽宁 沈阳 110159
- 折叠
摘要
针对高熵合金在低温条件下力学特性以及点火行为研究不足的现状,以含微量元素Cu、Al或Ni的TiZrHf系多主元高熵合金(HEA)为研究对象,结合SHPB试验系统与高速摄像系统,开展不同温度下高熵合金的动态压缩实验及点火特性实验,获得了弹性模量、应力峰值、硬化模量以及应变率与温度、元素种类的关联规律,并明确了元素种类对火焰面积、点火延迟时间、点火对应时刻以及剧烈反应持续时间的影响规律.结果表明,低温条件下 3 种HEA的应力-应变曲线均经历弹性、强化以及卸载阶段;在相近载荷条件下(～20 m/s,-40℃),含Cu和Ni的2 类试件均发生了点火现象,而含Al试件只有细微点火,试件的点火延迟时间均为25 μs,含Cu试件的剧烈反应持续时间与点火持续时间均大于含Ni试件.
Abstract
Addressing the gap in research on mechanical properties and ignition behavior of high-entropy alloys(HEAs)at low temperatures,this study investigated TiZrHf-based HEAs with trace amounts of Cu,Al,or Ni.Utilizing the split-Hopkinson pressure bar(SHPB)test system coupled with a high-speed camera system,the investigation tested HEAs for dynamic compression and ignition characteristics across at various tempera-tures.The study established the correlations between the elastic modulus,stress peak,hardening modulus,and strain rate with the temperature and element type.Furthermore,the study delineated how these elements in-fluence the flame area,ignition delay time,ignition timing,and duration of intense reaction.The results indi-cate that at low temperatures,the stress-strain curves of all three HEAs go through phases of elasticity,harden-ing,and unloading;under similar loading conditions(～20 m/s,-40℃),specimens containing Cu or Ni both exhibit ignition,whereas those with Al show only minor ignition.The ignition delay time for all the speci-mens is measured at 25 μs,with specimens containing Cu showing longer intense reaction duration and ignition duration compared to those containing Ni.
关键词
高熵合金/动态压缩/低温条件/SHPB/点火行为Key words
High-entropy alloys/Dynamic compression/Low temperatures/SHPB/Ignition behavior引用本文复制引用
基金项目
国家自然科学基金青年基金(12002220)
中央军委装备发展部国防重点实验室项目(6142902200404)
出版年
2024
NETL
NSTL
万方数据