应变速率和温度对Ir-W-Th合金力学性能的影响
Effects of strain rate and temperature on the mechanical properties of Ir-W-Th alloy
李奇颖 1张健康 2付全 3姚亮 1张文林 1刘毅 4戴华 5魏燕5
作者信息
- 1. 云南省贵金属新材料控股集团股份有限公司 稀贵金属综合利用新技术国家重点实验室,昆明 650106;昆明贵研科技新材料有限公司,昆明 650106
- 2. 云南省贵金属新材料控股集团股份有限公司 稀贵金属综合利用新技术国家重点实验室,昆明 650106;昆明贵金属研究所,昆明 650106
- 3. 昆明贵金属研究所,昆明 650106
- 4. 昆明贵金属研究所,昆明 650106;云南贵金属实验室有限公司,昆明 650106
- 5. 云南贵金属实验室有限公司,昆明 650106
- 折叠
摘要
研究了应变速率和温度对Ir-W-Th合金力学性能的影响,表征分析不同应变速率和温度下拉伸断裂的铱合金断口形貌.结果表明:铱合金在低应变速率(2.5×10-3 s-1)下,当试验温度从 25℃升高到 1600℃时,抗拉强度从 386.27 MPa降低到127.47 MPa,延伸率从 4.20%升高到 40.00%;随着温度升高,断裂方式由混合模式(穿晶断裂、沿晶断裂)转变为韧性穿晶断裂.在 600℃、应变率为 800 s-1 时铱合金只发生变形,不会发生拉伸断裂.当温度25～910℃范围内,1200 s-1速率拉伸下,随着温度升高,抗拉强度逐渐降低,与低应变速率抗拉强度相比,高应变速率下抗拉强度提升超过1.1 倍,断裂方式为沿晶断裂和穿晶断裂,随着温度升高铱合金塑性增加,说明铱合金具有应变率敏感性.
Abstract
The effects of strain rate and temperature on the mechanical properties of Ir-W-Th alloy were studied.The fracture morphology of the alloy was characterized at different strain rates and temperatures.The results show that when the test temperature rises from 25℃ to 1600℃ at a low strain rate of 2.5×10-3 s-1 the tensile strength drops from 386.27 MPa to 127.47 MPa while the elongation increases from 4.20% to 40.00% .With the increase of temperature,the fracture mode changes from a mixed mode(transgranular fracture,intergranular fracture)to ductile transgranular fracture.At 600℃ and a strain rate of 800 s-1,iridium alloy only deforms without tensile fracture.And at 1200 s-1 rate the tensile strength gradually decreases with the temperature going up from 25℃ to 910℃ .The tensile strength at a high strain rate increases by more than 1.1 times,compared with that at a low strain rate.The fracture mode invovles intergranular fracture and transgranular fracture.The plasticity is enhanced by increasing the temperature,indicating that iridium alloy is sensitive to the strain rate.
关键词
Ir-W-Th合金/应变速率/温度/抗拉强度/延伸率Key words
Ir-W-Th alloy/strain rate/temperature/tensile strength/elongation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据