Fragmentation process of platelet Al3Ti particles in compressed Al-Al3Ti alloy observed by serial sectioning and EBSD analysis
Fragmentation process of platelet Al3Ti particles in compressed Al-Al3Ti alloy observed by serial sectioning and EBSD analysis
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DOI：
10.1088/2053-1591/ab2fc0
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发表时间：
2019-07
影响因子：
2.3
通讯作者：
S. Duraisamy;H. Sato;Tadachika Chiba;Yoshimi Watanabe
中科院分区：
文献类型：
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作者：
S. Duraisamy;H. Sato;Tadachika Chiba;Yoshimi Watanabe
采用连续切片和背散射电子衍射(EBSD)相结合的方法，研究了Al-Al3Ti合金中片状Al3Ti颗粒在压缩过程中的破碎机理。为了详细观察片状Al3Ti颗粒的破碎过程，对片状Al3Ti颗粒进行了等面积观察。当Al-Al3Ti合金的名义应变达到5%时，在片状Al3Ti颗粒内部观察到平行于{112}Al3Ti痕迹的孪晶界。随后，当达到8%的标称应变时，在相同的片状Al3Ti颗粒中产生了裂纹。对破碎后的Al_3Ti颗粒进行了三维成像和结晶学分析，发现断口上的晶面取向为{112}Al_3Ti。由于{112}Al3Ti是Al3Ti的孪晶晶界，片状Al3Ti颗粒中的裂纹沿该晶界扩展。因此，Al-Al3Ti合金中的片状Al3Ti颗粒在孪晶变形后优先发生在孪晶界的碎裂。
The fragmentation mechanism of platelet Al3Ti particles in Al-Al3Ti alloy during compression was investigated by combining serial sectioning and electron backscatter diffraction (EBSD) analysis. To observe the fragmentation process of a platelet Al3Ti particle in detail, same-area observation of the platelet Al3Ti particles was performed. When the Al-Al3Ti alloy was compressed up to a nominal strain of 5%, a twin boundary parallel to the {112}Al3Ti trace was observed inside the platelet Al3Ti particle. Subsequently, when a nominal strain up to 8% was reached, a crack was generated in the same platelet Al3Ti particle. From three-dimensional imaging and the results of crystallographic analysis for the fragmented Al3Ti particle, it is found that the crystal plane orientation on the fracture surface was {112}Al3Ti. Because {112}Al3Ti is a twin boundary plane of Al3Ti, the crack in the platelet Al3Ti particle propagated along this boundary. Therefore, it is concluded that fragmentation of platelet Al3Ti particles in Al–Al3Ti alloy preferentially occurs at twin boundaries after twinning deformation.