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首页> 外文期刊>Materials Science and Engineering >Effect of orientation and loading rate on the incipient behavior of Ti_(60)(AlCrVNb)_(40) medium entropy alloy
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Effect of orientation and loading rate on the incipient behavior of Ti_(60)(AlCrVNb)_(40) medium entropy alloy

机译：取向和加载速率对Ti_（60）（AlCrVNb）_（40）熵合金初生行为的影响

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摘要

The influence of orientation and loading rate on the pop-in behavior of Ti_(60)(AlCrVNb)_(40) medium entropy alloy (MEA) under nanoindentation was investigated. The crystal structure of Ti_(60)(AlCrVNb)_(40) is a single body centered cubic phase, confirmed by both X-ray diffractometer and transmission electron microscopy. Nanoindentation experiments were carried out on the (100), (110) and (111) orientations and over loading rates of 10-500 μN/s. The incipient plasticity showed a clear orientation and loading rate dependences. Specifically, the (110) data exhibit the lowest pop-in load and pop-in displacement, and the associated loads of all orientations increase with increasing loading rate. In addition, the spread of the load at pop-in for (110) is narrower compared to those for (100) and (111), which is caused by the lower influence from defects on (110). The activation volume was estimated to be ～0.7 b~3, which falls between those of conventional metals (～0.3 b~3) and high entropy alloys (HEAs) (～1.7 b~3), suggesting that dislocation activities in MEAs is more difficult than that in traditional metals but easier than that in HEAs. Such a medium activation volume implies that the onset of yielding is associated with a mixture of two mechanisms: heterogeneous nudeation of dislocation through atomic-sized precursors and/or expansion of dislocation loop by pre-existing dislocation multiplication. The crystalline orientation effects can be rationalized by the different densities and dislocation configurations resulted from the different numbers of activated slip systems and Schmid factors for different loading planes.
机译：研究了取向和加载速率对纳米压痕下Ti_（60）（AlCrVNb）_（40）中等熵合金（MEA）弹入行为的影响。 Ti_（60）（AlCrVNb）_（40）的晶体结构为一体的立方相，这是通过X射线衍射仪和透射电子显微镜确定的。在（100），（110）和（111）方向以及10-500μN/ s的超载速率下进行了纳米压痕实验。初始可塑性表现出明显的取向和加载速率依赖性。具体而言，（110）数据显示出最低的弹入载荷和弹入位移，并且所有方向的关联载荷都随载荷率的增加而增加。另外，与（100）和（111）相比，（110）弹出时的载荷分布更窄，这是由于缺陷对（110）的影响较小。活化量估计为〜0.7 b〜3，介于常规金属（〜0.3 b〜3）和高熵合金（HEAs）（〜1.7 b〜3）之间，表明MEA中的位错活性更高比传统金属难，但比HEA容易。这样的中等活化量意味着屈服的开始与两种机制的混合有关：通过原子大小的前体进行的位错的异质裸核和/或通过预先存在的位错倍增来扩展位错环。结晶取向效应可以通过不同密度和位错构型来合理化，该密度和位错构型是由不同数量的活化滑移系统和施密特因子针对不同的加载平面而产生的。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|138969.1-138969.12|共12页
  • 作者

    X.K. Zhang; J.C. Huang; P.H. Lin; W.S. Chuang; T.Y. Liu; Y.C. Wu; Y.C. Liao; Jason S. C. Jang;

  • 作者单位

    Department of Materials Science & Engineering Hong Kong Institute for Advanced Study City University of Hong Kong Kowloon Hong Kong;

    Department of Materials Science & Engineering Hong Kong Institute for Advanced Study City University of Hong Kong Kowloon Hong Kong Department of Materials and Optoelectronic Science National Sun Yat-Sen University Kaohsiung 804 Taiwan;

    Department of Materials and Optoelectronic Science National Sun Yat-Sen University Kaohsiung 804 Taiwan;

    Department of Mechanical Engineering Institute of Materials Science and Engineering National Central University Chung-Li Taiwan;

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  • 正文语种 eng
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  • 关键词

    Medium entropy alloy; Nanoindentation; Incipient behavior; Grain orientation; Loading rate;

    机译：中熵合金;纳米压痕初期行为;晶粒取向;装车率;

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