1}壓縮孿晶及{101}-{102}雙孿晶在協(xié)調(diào)合金的塑性應(yīng)變中發(fā)揮了重要作用。此外，大量動態(tài)再結(jié)晶在壓縮孿晶及雙孿晶內(nèi)部發(fā)生，并擴(kuò)展到非孿晶區(qū)域，有效緩解了軋制過程中的內(nèi)應(yīng)力集中。上述2個過程對提高合金在大應(yīng)變量軋制中的成形性均起到了促進(jìn)作用。"/>

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Mg-3Y合金大應(yīng)變量軋制過程中的孿生輔助動態(tài)再結(jié)晶及組織演變
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江蘇大學(xué) 材料科學(xué)與工程學(xué)院，江蘇 鎮(zhèn)江 212013

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基金項目:

國家自然科學(xué)基金（No.21403092），江蘇省高校自然科學(xué)基金（No.17KJB430008）


Twinning Assisted Dynamic Recrystallization and Related Microstructure Evolution During Large Strain Rolling of Mg-3Y Alloy
Author:
Affiliation:

School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

Fund Project:

National Natural Science Foundation of China (21403092); Natural Science Fund for Colleges and Universities in Jiangsu Province (17KJB430008)

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    摘要:

    采用預(yù)擠壓加單道次大應(yīng)變量熱軋制的方法制備了Mg-3Y（質(zhì)量分?jǐn)?shù)，%）合金板材。并研究了大應(yīng)變量軋制過程中不同孿晶類型對合金動態(tài)再結(jié)晶（DRX）及組織演變的影響。結(jié)果表明，在擠壓比為8:1的預(yù)擠壓過程中，合金內(nèi)部發(fā)生了幾乎完全的動態(tài)再結(jié)晶。而在接下來的大應(yīng)變量熱軋制過程中，孿生變形尤其是{101}壓縮孿晶及{101}-{102}雙孿晶在協(xié)調(diào)合金的塑性應(yīng)變中發(fā)揮了重要作用。此外，大量動態(tài)再結(jié)晶在壓縮孿晶及雙孿晶內(nèi)部發(fā)生，并擴(kuò)展到非孿晶區(qū)域，有效緩解了軋制過程中的內(nèi)應(yīng)力集中。上述2個過程對提高合金在大應(yīng)變量軋制中的成形性均起到了促進(jìn)作用。

    Abstract:

    The Mg-3Y (wt%) alloy sheet was fabricated by pre-extrusion and subsequent single-pass large strain hot rolling process. The influences of different twinning types on dynamic recrystallization (DRX) and grain structure evolution during large strain hot rolling were investigated. Results show that the alloy undergoes nearly complete DRX during pre-extrusion processing under a low extrusion ratio of 8:1. During subsequent large strain hot rolling processing, deformation twinning, especially the {101} compres-sion and {101}-{102} double twinning, plays an important role in plastic strain accommodation. Moreover, the compression twin and double twin assisted DRX occurs extensively within the grains, and the recrystallization region is extended from the twin interior towards non-twinned regions, greatly relieving the internal stress. Both of processes above promote the formability of the alloy during large strain hot rolling processing.

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陳毓美,劉權(quán)震,劉安國,侯秀麗.Mg-3Y合金大應(yīng)變量軋制過程中的孿生輔助動態(tài)再結(jié)晶及組織演變[J].稀有金屬材料與工程,2023,52(6):2068~2074.[Chen Yumei, Liu Quanzhen, Liu Anguo, Hou Xiuli. Twinning Assisted Dynamic Recrystallization and Related Microstructure Evolution During Large Strain Rolling of Mg-3Y Alloy[J]. Rare Metal Materials and Engineering,2023,52(6):2068~2074.]
DOI：10.12442/j. issn.1002-185X. E20230004

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  • 收稿日期:2023-01-21
  • 最后修改日期:2023-02-11
  • 錄用日期:2023-02-21
  • 在線發(fā)布日期: 2023-07-03
  • 出版日期: 2023-06-30