C5191磷青铜的动态拉伸性能和变形机制（英文）

发布时间：2018-02-08 23:56

本文关键词： C磷青铜动态拉伸行为应变速率敏感性位错运动　出处：《稀有金属材料与工程》2017年06期 　论文类型：期刊论文

【摘要】：为了探讨C5191磷青铜在高应变速率条件下的动态响应,解决高速冲压工艺问题,利用电子万能材料试验机和分离式Hopkinson拉杆装置对C5191磷青铜分别进行应变速率为0.001和500、1000、1500 s~(-1)的准静态和动态拉伸试验,结合SEM和TEM等手段,研究了C5191磷青铜的动态拉伸性能及其变形机制。结果表明:C5191磷青铜高应变速率动态拉伸与准静态条件相比较,其屈服强度和抗拉强度分别提升了32.77%和11.07%;应变硬化指数由0.075增加到0.251;材料强度的应变速率敏感指数由0.005变化到0.022,呈现出明显的应变速率敏感性;高应变速率动态拉伸过程中,位错运动速度加快,导致位错"近程阻力"加大,使C5191磷青铜的变形抗力随着应变速率的增加而增大。可动位错数量的显著增多,多系滑移的开启,以及绝热温升软化效应在一定程度上提高了C5191磷青铜高应变速率动态拉伸时的塑性。
[Abstract]:In order to study the dynamic response of C5191 phosphor bronze under high strain rate, the problem of high speed stamping process was solved. The quasi-static and dynamic tensile tests of C5191 phosphor bronze with strain rates of 0.001 and 500 ~ 1000 ~ 1 ~ 1500s ~ (-1) were carried out by means of electronic universal material testing machine and split Hopkinson rod device, respectively, and combined with means of SEM and TEM, etc. The dynamic tensile properties and deformation mechanism of C5191 phosphor bronze were studied. The results show that the high strain rate dynamic tension of C5191 phosphor bronze is compared with the quasi-static condition. The yield strength and tensile strength increased by 32.77% and 11.07, respectively; the strain hardening index increased from 0.075 to 0.251; the strain rate sensitivity index of material strength changed from 0.005 to 0.022, which showed obvious strain rate sensitivity. With the increase of strain rate, the deformation resistance of C5191 phosphor bronze increases with the increase of strain rate. And the effect of adiabatic temperature rise and softening can improve the plasticity of C5191 phosphorus bronze during dynamic tensile at high strain rate to some extent.
【作者单位】：南京航空航天大学;台州职业技术学院;
【分类号】：TG146.11

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