-1~10 s-1條件下的高溫不連續(xù)屈服行為和絕熱溫升效應(yīng),并對這兩種同名義成分不同制備工藝的鈦合金進(jìn)行了對比研究。結(jié)果表明：兩種合金不連續(xù)屈服的幅度均與應(yīng)變速率呈正相關(guān)關(guān)系,并與溫度呈近似負(fù)相關(guān)關(guān)系, 兩種合金中出現(xiàn)的不連續(xù)屈服現(xiàn)象符合動態(tài)理論。在相同變形條件下,鑄態(tài)合金中不連續(xù)屈服的幅度更大,其原因是相對于粉末冶金態(tài)合金,鑄態(tài)合金中的起始位錯密度低,這更有利于晶界處可動位錯的突然增殖與擴(kuò)展。兩種合金在熱變形中絕熱溫升的大小均隨應(yīng)變速率的升高而逐漸增大,并隨著變形溫度的升高而逐漸降低。在相同變形條件下,粉末冶金態(tài)合金的絕熱溫升效應(yīng)相比與鑄態(tài)合金較弱,這是因?yàn)榉勰┮苯饝B(tài)合金具有較低的變形抗力和較高的協(xié)調(diào)變形能力。"/>

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粉末冶金態(tài)與鑄態(tài)Ti-5553合金高溫不連續(xù)屈服行為和絕熱溫升效應(yīng)對比研究
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作者單位:

1.長安大學(xué) 材料科學(xué)與工程學(xué)院;2.新西蘭懷卡托大學(xué)

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New Zealand Ministry of Business, Innovation and Employment (UOWX1402)


Comparison of Discontinuous Yielding Phenomenon and Adiabatic Temperature Rising of Ti-5553 Alloy Prepared by Powder and Ingot Metallurgy Approaches during Hot Compression
Author:
Affiliation:

1.School of Material Science and Engineering,Chang’an University,Xi’an;2.School of Engineering,University of Waikato,Hamilton ,New Zealand

Fund Project:

New Zealand Ministry of Business, Innovation and Employment (UOWX1402)

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    摘要:

    本文系統(tǒng)地研究了粉末冶金態(tài)與鑄態(tài)Ti-5553合金在溫度為700 ℃~1100 ℃、應(yīng)變速率為0.001 s-1~10 s-1條件下的高溫不連續(xù)屈服行為和絕熱溫升效應(yīng),并對這兩種同名義成分不同制備工藝的鈦合金進(jìn)行了對比研究。結(jié)果表明：兩種合金不連續(xù)屈服的幅度均與應(yīng)變速率呈正相關(guān)關(guān)系,并與溫度呈近似負(fù)相關(guān)關(guān)系, 兩種合金中出現(xiàn)的不連續(xù)屈服現(xiàn)象符合動態(tài)理論。在相同變形條件下,鑄態(tài)合金中不連續(xù)屈服的幅度更大,其原因是相對于粉末冶金態(tài)合金,鑄態(tài)合金中的起始位錯密度低,這更有利于晶界處可動位錯的突然增殖與擴(kuò)展。兩種合金在熱變形中絕熱溫升的大小均隨應(yīng)變速率的升高而逐漸增大,并隨著變形溫度的升高而逐漸降低。在相同變形條件下,粉末冶金態(tài)合金的絕熱溫升效應(yīng)相比與鑄態(tài)合金較弱,這是因?yàn)榉勰┮苯饝B(tài)合金具有較低的變形抗力和較高的協(xié)調(diào)變形能力。

    Abstract:

    Discontinuous yielding phenomenon (DYP) and adiabatic temperature rising (ATR) effect have been investigated in this paper for Ti-5553 (Ti-5Al-5Mo-5V-3Cr) alloys manufactured by powder metallurgy (PM) and ingot metallurgy (IM) approaches based on hot compression testing conducted at the temperature range of 700 °C to 1100 °C and the strain rate range of 0.001 s-1 to 10 s-1. The results show that the magnitude of yield drop exhibits a positive correlation to strain rate but nearly a negative correlation to deformation temperature for both PM and IM alloys, and the occurrences of DYP in the alloys are elucidated by the dynamic theory. IM alloy shows a higher degree of yield drop than PM alloy at the same condition because of low initial dislocation density at as-cast state and the subsequently promoted newly-generated mobile dislocation from grain boundary. Strong positive correlation between ATR effect and strain rate but intensive negative correlation when it subjected to deformation temperature are uncovered for the two alloys. PM alloy shows a lower degree of ATR effect at the same processing condition than IM alloy as a result of its lower deformation resistance and higher deformation compatibility.

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趙秦陽,陳永楠,徐義庫,Fei Yang, Leandro Bolzoni.粉末冶金態(tài)與鑄態(tài)Ti-5553合金高溫不連續(xù)屈服行為和絕熱溫升效應(yīng)對比研究[J].稀有金屬材料與工程,2020,49(8):2567~2573.[Qinyang Zhao, Yongnan Chen, Yiku Xu, Fei Yang, Leandro Bolzoni. Comparison of Discontinuous Yielding Phenomenon and Adiabatic Temperature Rising of Ti-5553 Alloy Prepared by Powder and Ingot Metallurgy Approaches during Hot Compression[J]. Rare Metal Materials and Engineering,2020,49(8):2567~2573.]
DOI：10.12442/j. issn.1002-185X.20200090

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  • 收稿日期:2020-02-15
  • 最后修改日期:2020-02-24
  • 錄用日期:2020-03-05
  • 在線發(fā)布日期: 2020-09-27
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