Grain contrast是什么意思

用法例句

Prediction and experimental research of grain axial ratio of Ti-15-3 alloy during hot deformation;

Ti-15-3合金热变形过程晶粒轴比的预测

The forming reasons of the br ight crystal of the billets are analyzed and the bright crystal metallurgical defect is eliminated at last after we take the effective preventive measures.

2A12铝合金Φ550mm圆铸锭在挤压后,发现有光亮晶粒而导致挤压棒材报废。