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Evolution of microstructure and mechanical properties of ZK60 magnesium alloy processed by asymmetric lowered-temperature rolling 被引量:3
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作者 Wen-cong ZHANG Xin-tong LIU +4 位作者 jun-fei ma Wen-ke WANG Wen-zhen CHEN Yu-xuan LIU Jian-lei YANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第9期2877-2888,共12页
Asymmetric lowered-temperature rolling was applied to the fabrication of fine-grained ZK60 magnesium alloy sheet with weak basal texture along the rolling direction(RD).The results showed that multi-pass lowered-tempe... Asymmetric lowered-temperature rolling was applied to the fabrication of fine-grained ZK60 magnesium alloy sheet with weak basal texture along the rolling direction(RD).The results showed that multi-pass lowered-temperature rolling could significantly improve the microstructure homogeneity and refine the grain size.Meanwhile,a fiber texture along the transverse direction(TD)gradually developed during rolling process.Importantly,the shear deformation along the RD made the c-axis of basal plane rotate to the RD,weakening the basal texture along this direction.Influenced by such microstructure variation,the yield strength along the TD continuously increased due to the successive grain refinement and the increased activation of prismatic slips,whereas the uniform elongation decreased owing to the decline of strain hardening ability.In contrast,the continuous weakening of basal texture along the RD increased the activation of soft basal slips,greatly offsetting the strengthening effect contributed by grain refinement and thereby causing the slight decrease of yield strength. 展开更多
关键词 ROLLING asymmetric rolling grain size TEXTURE yield stress
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双峰基面织构对Mg-2.6Nd-0.55Zn-0.5Zr合金弯曲应力及显微组织演变的影响
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作者 张文丛 刘宇轩 +4 位作者 马俊飞 王文珂 陈文振 刘欣彤 杨建雷 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2023年第3期714-727,共14页
沿Mg-2.6Nd-0.55Zn-0.5Zr板材挤压方向(ED)和横向(TD)分别切取试样,研究双峰基面织构对其弯曲应力及显微组织演变的影响。结果显示,具有弱基面织构的ED试样比TD试样的弯曲应力低很多。这种各向异性是不同织构状态对变形机制及显微组织... 沿Mg-2.6Nd-0.55Zn-0.5Zr板材挤压方向(ED)和横向(TD)分别切取试样,研究双峰基面织构对其弯曲应力及显微组织演变的影响。结果显示,具有弱基面织构的ED试样比TD试样的弯曲应力低很多。这种各向异性是不同织构状态对变形机制及显微组织演变的作用所导致的。对于具有弱基面织构的ED试样,其主要的变形机制是基面滑移:内侧区域存在少量的{10■2}拉伸孪生,而外侧区域则是基面滑移和柱面滑移。相比之下,具有强基面织构的TD试样在内侧区域激活更多的{10■2}拉伸孪生,在外侧区域激活更多的柱面滑移。{10■2}拉伸孪生的激活一方面促使<0002>//压缩方向类型的织构增加,使内侧区域的织构角度限制在±30°范围内,另一方面减少高位错密度和低角度晶界的出现几率。{10■2}拉伸孪生的大量激活使TD试样保持高应变硬化能力,是该试样具有较高弯曲应力的根本原因。 展开更多
关键词 Mg-Nd-Zn-Zr合金 织构 拉伸孪生 三点弯曲 弯曲应力 显微组织演变
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