Microstructure control and tensile properties of three-phase alloys based on the E21 Co3AlC and B2CoAl
Microstructure control and tensile properties of three-phase alloys based on the E21 Co3AlC and B2CoAl
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DOI：
10.1016/s0966-9795(01)00113-3
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发表时间：
2001-12-01
期刊：
影响因子：
4.4
通讯作者：
Liu, CT
中科院分区：
文献类型：
--
作者：
Kimura, Y;Mishima, Y;Liu, CT
为了研究三相合金的拉伸力学行为，在室温和1273K下对由E2(1)Co3AlC、B2煤和(Co)初生固溶体组成的三相合金进行了拉伸试验。含有较大体积分数E21相的合金具有良好的塑性，室温塑性应变大于5%，而含有大量粗大的B2相颗粒的合金则为零塑性。本研究采用显微组织控制的方法来改善E2(1)/B2/(Co)三相合金的室温塑性。为了消除凝固缺陷，最大限度地减少铸态组织的不均一性，进行了热锻造和后续热处理。这些形变处理和成分控制有效地改善了E2(1)/B2/(Co)三相合金在常温和1273K(C)2001 Elsevier Science Ltd.的延展性。
To investigate tensile mechanical behavior, tensile tests were conducted at room temperature and 1273 K on three-phase alloys consisting of the E2(1) Co3AlC, B2 CoAl and (Co) primary solid solution. The alloy containing a large volume fraction of E21 phase exhibits excellent ductility, exceeding 5% plastic strain at room temperature, while the alloy with a,considerable amount of coarse B2 phase particles shows zero ductility. In this study, microstructure control was used to improve the ambient temperature ductility of the E2(1)/B2/(Co) three-phase alloys. Hot forging and subsequent heat treatments were performed aiming at eliminating solidification defects and minimizing the heterogeneity of the as-cast microstructure. These thermomechanical treatments together with compositional control effectively improve the ductility of the E2(1)/B2/(Co) three-phase alloys at ambient temperature and 1273 K. (C) 2001 Elsevier Science Ltd. All rights reserved.