首页|含基面或柱面Mg2Sn的Mg-Sn合金的压缩孪生行为

含基面或柱面Mg2Sn的Mg-Sn合金的压缩孪生行为

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采用含有基面或柱面Mg2Sn相的镁锡合金定量揭示析出取向对孪生行为的影响.对含有基面或柱面Mg2Sn的Mg-5％Sn(质量分数)合金进行压缩,研究其孪生行为.随后,构建一个Orowan强化模型,以定量研究孪生析出相的临界分切应力增量.结果表明,柱面析出相比基面析出相更能有效地阻碍拉伸孪晶的转移和生长.对比含基面析出相的合金,含柱面析出相的拉伸孪晶比例下降归因于拉伸孪晶的临界分切应力增量更大.含有柱面析出相的孪晶转移比率明显降低,归因于该合金中拉伸孪晶的几何必需位错较高和临界分切应力增强.值得注意的是,柱面析出相在压缩过程中对拉伸孪晶具有更好的阻碍作用.
Twinning behaviors of Mg-Sn alloy with basal or prismatic Mg2Sn
The Mg-Sn alloys,with basal or prismatic Mg2Sn laths,were employed to reveal the effect of precipitate orientation on twinning behavior quantitatively.The Mg-5wt.％Sn alloys with basal or prismatic Mg2Sn were compressed to study the twinning behaviors.Subsequently,an Orowan strengthening model was developed to quantitatively investigate the critical resolved shear stress(CRSS)increment of precipitates on twinning.The results revealed that the prismatic precipitates hindered the transfer and growth of tensile twins more effectively compared with the basal precipitates.The decreased proportion of tensile twins containing prismatic Mg2Sn might be attributed to a larger CRSS increment for tensile twins compared with that for basal precipitates.The obvious decreased twinning transfer in the alloy with prismatic Mg2Sn could be due to its higher geometrically necessary dislocation and enhanced CRSS of tensile twins.Notably,the prismatic precipitates have a better hindering effect on tensile twins during compression.

Mg-Sn alloyorientation regulationtwinning behaviorMg2Sn lathOrowan strengthening

付瑞豪、万杨杰、熊训飞、尹冬弟、刘满平、蒋斌、周梓荣、高瑜阳、曾迎

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重庆大学国家镁合金材料工程技术研究中心,重庆 400044

西南交通大学材料科学与工程学院材料先进技术教育部重点实验室,成都 610031

江苏大学材料科学与工程学院,镇江 212013

东莞理工学院科技创新研究所,东莞 523007

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镁锡合金 取向调控 孪生行为 Mg2Sn柱面相 Orowan强化

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Postdoctoral Science FoundationKey Area Research and Development Program of Guangdong Province,China

52004227U22A20187522011062020M6832402020B090924002

2024

10.1016/S1003-6326(24)66577-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(9)
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