首页|Mg-Gd-Y-Zr合金在轻微-严重磨损转变状态下的法向载荷与试验温度之间的关系

Mg-Gd-Y-Zr合金在轻微-严重磨损转变状态下的法向载荷与试验温度之间的关系

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研究Mg-10Gd-1.5Y-0.4Zr合金的磨损率变化、磨损转变及其与载荷和温度之间的关系.在20～200℃试验温度范围内,在销盘式试验机上进行磨损试验.磨损表面形貌和成分采用SEM和EDS方法进行检测.实验结果表明:在载荷恒定为20、35和40 N时,每条磨损率-温度曲线上均会出现一个与轻微-严重磨损转变相对应的转折点.在轻微磨损时,表层材料因发生塑性变形而产生应变硬化,而在严重磨损时,表层材料因发生动态再结晶而发生软化.增加法向载荷将降低轻微-严重磨损转变的临界温度,法向载荷与发生轻微-严重磨损转变的临界温度之间呈现出近似的线性关系.研究表明:合金的轻微-严重磨损转变服从表面动态再结晶温度准则.
Relation of normal load with test temperature at mild-severe wear transition state for Mg-Gd-Y-Zr alloy
The wear behavior and mild-severe (M-S) wear transition of Mg-10Gd-1.5Y-0.4Zr alloy were investigated within a temperature range of 20-200 ℃. The morphologies and compositions of worn surfaces were examined to identify the wear mechanisms using scanning electron microscope and energy dispersive X-ray spectrometer. The microstructure and hardness in the subsurfaces were analyzed to reveal the M-S wear transition mechanism. Under a constant loads of 20, 35 and 40 N, each wear rate-test temperature curve presented a turning point which corresponded to the M-S wear transition. In mild wear, the surface material was plastically deformed and hence was strain- hardened, whereas in severe wear, the surface material was dynamically recrystallized and consequently was softened. It has been found that the critical temperature for M-S wear transition decreases with increasing the normal load, and the normal load exhibits an almost linear relationship with critical temperature for M-S wear transition. This work reveals that the M-S wear transition of the studied alloy conforms to the surface DRX temperature criterion.

Mg-Gd-Y-Zr alloyelevated-temperature wearmicrostructurerecrystallizationmild-severe wear transition

王渊博、赵伟、李亮、安健

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吉林大学材料科学与工程学院,长春 130025

吉林大学教育部汽车材料重点实验室,长春 130025

Mg-Gd-Y-Zr合金 高温磨损 显微组织 再结晶 轻微-严重磨损转变

authors are grateful for the financial support from the National Natural Science Foundation of China

51775226

2021

10.1016/S1003-6326(21)65708-4

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(10)
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