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純鎂在高壓扭轉(zhuǎn)處理中的結(jié)構(gòu)及硬度演變
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中南大學(xué)粉末冶金國家重點(diǎn)實(shí)驗(yàn)室,中南大學(xué)粉末冶金國家重點(diǎn)實(shí)驗(yàn)室,中南大學(xué)粉末冶金國家重點(diǎn)實(shí)驗(yàn)室,中南大學(xué)粉末冶金國家重點(diǎn)實(shí)驗(yàn)室

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國家自然科學(xué)基金項(xiàng)目（青年基金）


Structural and hardness evolution of pure magnesium subject to high pressure torsion
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State Key Laboratory of Powder Metallurgy,Central South University,State Key Laboratory of Powder Metallurgy,Central South University,State Key Laboratory of Powder Metallurgy,Central South University,State Key Laboratory of Powder Metallurgy,Central South University

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    摘要:

    本文研究了純鎂在室溫高壓扭轉(zhuǎn)處理過程中的結(jié)構(gòu)及硬度演變，系統(tǒng)探索了硬度達(dá)到穩(wěn)態(tài)后時(shí)晶粒尺寸的演變。研究結(jié)果表明，在變形的初始階段硬度隨著應(yīng)變的增加而增大，并達(dá)到一個(gè)最大值（~53 Hv），隨后硬度隨著應(yīng)變的增加將降低到一個(gè)穩(wěn)定值。然而，當(dāng)硬度值處于穩(wěn)態(tài)時(shí)，晶粒尺寸并不是處于穩(wěn)態(tài)的。在高壓扭轉(zhuǎn)的過程中，硬度值隨應(yīng)變的演變和晶粒尺寸隨硬度值的演變是不一致的。當(dāng)硬度值處于穩(wěn)態(tài)時(shí)，晶粒尺寸的進(jìn)一步減小是由于動(dòng)態(tài)回復(fù)和動(dòng)態(tài)再結(jié)晶照成的位錯(cuò)湮滅。而動(dòng)態(tài)回復(fù)和動(dòng)態(tài)再結(jié)晶的發(fā)生來源于高壓扭轉(zhuǎn)過程中的溫度上升以及純鎂較低的熔點(diǎn)。

    Abstract:

    Pure Mg was subjected to high pressure torsion (HPT) at room temperature, and the structural and hardness evolutions were studied. In addition, the grain size evolution during the hardness steady state was systematically investigated. The results indicated that the hardness initially increases with increasing the equivalent strain, reaches a maximum value of ~53 Hv, and then decreases to a steady-state level at large strains. However, although the hardness reaches the steady state, the average grain size does not reach a steady state. The evolution of the grain size is different from the evolution of the hardness during the HPT processing. The continuously decreased grain size during harness steady state may be caused by the annihilation of the dislocations during dynamic recovery or dynamic recrystallization, resulted from the temperature rising during the continuous HPT processing and the low melting temperature of Mg.

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顧及,楊曉輝,倪頌,宋旼.純鎂在高壓扭轉(zhuǎn)處理中的結(jié)構(gòu)及硬度演變[J].稀有金屬材料與工程,2018,47(5):1347~1351.[Gu Ji, Yang Xiaohui, Ni Song, Song Min. Structural and hardness evolution of pure magnesium subject to high pressure torsion[J]. Rare Metal Materials and Engineering,2018,47(5):1347~1351.]
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  • 收稿日期:2016-08-23
  • 最后修改日期:2016-10-12
  • 錄用日期:2016-11-10
  • 在線發(fā)布日期: 2018-06-08
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