文章信息/Info

Title:

Research Progress on the Plastic Instability Phenomenon of Metal Materials

作者:

 許道奎1; 李傳強1; 2; 韓恩厚1; 王磊2

 (1.中國科學院金屬研究所材料環境腐蝕研究中心，遼寧 沈陽 110016)
(2.東北大學材料與冶金學院，遼寧 沈陽 110819)

Author(s):

XU Daokui1; LI Chuanqiang1; 2; HAN Enhou1; Wang Lei2

(1.Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)
(2.School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China)

關鍵詞:

金屬材料; Portevin�睱e Chatelier效應; 鋸齒流變; 動態應變時效

DOI:

10.7502/j.issn.1674-3962.2016.03.08

文獻標志碼:

A

摘要:

對于金屬合金材料而言，出現的“塑性不穩定”現象或Portevin�睱e Chatelier (PLC)效應主要表現為應力-應變曲線上的鋸齒狀波動，并伴隨著空間上可傳播的應變局域化，致使材料經受力變形后表面會出現凹凸化，最終導致材料整體塑性的降低。近年來，關于PLC效應的研究及其相應的實驗手段已有很多相關報道。根據出現PLC效應的時空特性進行分類，鋸齒波可分為A、B和C 3種類型。目前，關于PLC效應的理論解釋主要歸因于動態應變時效和位錯切割機制。將重點介紹傳統金屬材料中存在塑性不穩定現象的研究進展，敘述并歸納微觀結構、加載速率、受力狀態和微觀變形機制等對PLC效應的影響和作用規律，指出目前研究中存在的問題，提出將來的研究重點和發展方向。

Abstract:

The phenomenon of plastic instability or Portevin�睱e Chatelier (PLC) effect showing a serrated wave on the stress�瞫train curve and accompanied with the propagation of strain localization in space can widely occur in many metal materials and induce sags and crests on the surface of materials during serrated flow, resulting in a degradation of the whole plasticity. On the basis of its space�瞭ime characteristics, the serrated wave can be divided into A, B and C types. At present, it mainly exists two main theoretical models, i.e. dynamic strain aging (DSA) and dislocation cutting mechanism for the explanation of the PLC effect. In this paper, the emphasis will be put on the research progress of the PLC effect occurred in the traditional metal materials. Moreover, the recent research work about effects of microstructure, strain rate, stress state and micro mechanism on the PLC effect of metallic materials are reviewed and concluded. Finally, the existing problems in the current study, the research emphasis，direction in the future are also pointed out.