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。
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.
作者
李奇颖
张健康
付全
姚亮
张文林
刘毅
戴华
魏燕
LI Qiying;ZHANG Jiankang;FU Quan;YAO Liang;ZHANG Wenlin;LIU Yi;DAI Hua;WEI Yan(State Key Laboratory of Advance Technologies for Comprehensive Utilization of Platinum Metal,Sino-Platinum Metals Co.Ltd.,Kunming 650106,China;Kunming Precious Materials&Technology Co.Ltd.,Kunming 650106,China;Kunming Institute of Precious Metals,Kunming 650106,China;Yunnan Precious Metals Laboratory Co.Ltd.,Kunming 650106,China)
出处
《贵金属》
CAS
北大核心
2024年第4期22-27,36,共7页
Precious Metals
基金
云南省基础研究专项青年项目(202001AU070050)
云南省科技人才与平台计划(202305AF150169)
国家自然科学基金(52161005)
云南省贵金属实验室项目(YPML-2022050215)
云南省贵金属实验室项目(YPML-2022050220)
云南省贵金属实验室项目(YPML-2022050225)
中央引导地方项目(202307AA110003)。
